ADVERSE REACTIONS SECTION.


6 ADVERSE REACTIONS. The following clinically significant adverse reactions are described elsewhere in the labeling:Hemorrhage [see Warnings and Precautions (5.2) ]Heparin-Induced Thrombocytopenia and Heparin-Induced Thrombocytopenia and Thrombosis [see Warnings and Precautions (5.3) ]Risk of Serious Adverse Reactions in Infants Due to Benzyl Alcohol Preservative [see Warnings and Precautions (5.4) ]Thrombocytopenia [see Warnings and Precautions (5.5) ]Heparin Resistance [see Warnings and Precautions (5.7) ]Hypersensitivity [see Warnings and Precautions (5.8) ]. Hemorrhage [see Warnings and Precautions (5.2) ]. Heparin-Induced Thrombocytopenia and Heparin-Induced Thrombocytopenia and Thrombosis [see Warnings and Precautions (5.3) ]. Risk of Serious Adverse Reactions in Infants Due to Benzyl Alcohol Preservative [see Warnings and Precautions (5.4) ]. Thrombocytopenia [see Warnings and Precautions (5.5) ]. Heparin Resistance [see Warnings and Precautions (5.7) ]. Hypersensitivity [see Warnings and Precautions (5.8) ]. Most common adverse reactions are hemorrhage, thrombocytopenia, HIT and HITTS, injection site irritation, general hypersensitivity reactions, and elevations of aminotransferase levels. (6.1) To report SUSPECTED ADVERSE REACTIONS, contact Hikma Pharmaceuticals USA Inc. at 1-877-845-0689 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.. 6.1 Postmarketing Experience. The following adverse reactions have been identified during post approval use of Heparin Sodium Injection. Because these reactions are reported voluntarily from population of uncertain size, it is not always possible to reliably estimate their frequency or establish causal relationship to drug exposure.Hemorrhage is the chief complication that may result from heparin therapy [see Warnings and Precautions (5.2) ]. Gastrointestinal or urinary tract bleeding during anticoagulant therapy may indicate the presence of an underlying occult lesion. Bleeding can occur at any site but certain specific hemorrhagic complications may be difficult to detect: Adrenal hemorrhage, with resultant acute adrenal insufficiency, has occurred with heparin therapy, including fatal cases. Ovarian (corpus luteum) hemorrhage developed in number of women of reproductive age receiving short- or long-term heparin therapy. Retroperitoneal hemorrhage HIT and HITT, including delayed onset cases [see Warnings and Precautions (5.3) ].Local Irritation Local irritation, erythema, mild pain, hematoma or ulceration may follow deep subcutaneous (intrafat) injection of heparin sodium. Because these complications are much more common after intramuscular use, the intramuscular route is not recommended.Histamine-like reactions Such reactions have been observed at the site of injections. Necrosis of the skin has been reported at the site of subcutaneous injection of heparin, occasionally requiring skin grafting [see Warnings and Precautions (5.3) ].Hypersensitivity Generalized hypersensitivity reactions have been reported, with chills, fever and urticaria as the most usual manifestations, and asthma, rhinitis, lacrimation, headache, nausea and vomiting, and anaphylactoid reactions, including shock, occurring less frequently. Itching and burning, especially on the plantar side of the feet, may occur [see Warnings and Precautions (5.8) ].Elevations of aminotransferases Significant elevations of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels have occurred in patients who have received heparin. Miscellaneous Osteoporosis following long-term administration of high doses of heparin, cutaneous necrosis after systemic administration, suppression of aldosterone synthesis, delayed transient alopecia, priapism, and rebound hyperlipemia on discontinuation of heparin sodium have also been reported.. Hemorrhage is the chief complication that may result from heparin therapy [see Warnings and Precautions (5.2) ]. Gastrointestinal or urinary tract bleeding during anticoagulant therapy may indicate the presence of an underlying occult lesion. Bleeding can occur at any site but certain specific hemorrhagic complications may be difficult to detect: Adrenal hemorrhage, with resultant acute adrenal insufficiency, has occurred with heparin therapy, including fatal cases. Ovarian (corpus luteum) hemorrhage developed in number of women of reproductive age receiving short- or long-term heparin therapy. Retroperitoneal hemorrhage Adrenal hemorrhage, with resultant acute adrenal insufficiency, has occurred with heparin therapy, including fatal cases. Ovarian (corpus luteum) hemorrhage developed in number of women of reproductive age receiving short- or long-term heparin therapy. Retroperitoneal hemorrhage. HIT and HITT, including delayed onset cases [see Warnings and Precautions (5.3) ].. Local Irritation Local irritation, erythema, mild pain, hematoma or ulceration may follow deep subcutaneous (intrafat) injection of heparin sodium. Because these complications are much more common after intramuscular use, the intramuscular route is not recommended.. Histamine-like reactions Such reactions have been observed at the site of injections. Necrosis of the skin has been reported at the site of subcutaneous injection of heparin, occasionally requiring skin grafting [see Warnings and Precautions (5.3) ].. Hypersensitivity Generalized hypersensitivity reactions have been reported, with chills, fever and urticaria as the most usual manifestations, and asthma, rhinitis, lacrimation, headache, nausea and vomiting, and anaphylactoid reactions, including shock, occurring less frequently. Itching and burning, especially on the plantar side of the feet, may occur [see Warnings and Precautions (5.8) ].. Elevations of aminotransferases Significant elevations of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) levels have occurred in patients who have received heparin. Miscellaneous Osteoporosis following long-term administration of high doses of heparin, cutaneous necrosis after systemic administration, suppression of aldosterone synthesis, delayed transient alopecia, priapism, and rebound hyperlipemia on discontinuation of heparin sodium have also been reported.

CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION.


13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility. No long-term studies in animals have been performed to evaluate carcinogenic potential of heparin. Also, no reproduction studies in animals have been performed concerning mutagenesis or impairment of fertility.

CLINICAL PHARMACOLOGY SECTION.


12 CLINICAL PHARMACOLOGY. 12.1 Mechanism of Action. Heparin interacts with the naturally occurring plasma protein, Antithrombin III, to induce conformational change, which markedly enhances the serine protease activity of Antithrombin III, thereby inhibiting the activated coagulation factors involved in the clotting sequence, particularly Xa and IIa. Small amounts of heparin inhibit Factor Xa, and larger amounts inhibit thrombin (Factor IIa). Heparin also prevents the formation of stable fibrin clot by inhibiting the activation of the fibrin stabilizing factor. Heparin does not have fibrinolytic activity; therefore, it will not lyse existing clots.. 12.2 Pharmacodynamics. Various times (activated clotting time, activated partial thromboplastin time, prothrombin time, whole blood clotting time) are prolonged by full therapeutic doses of heparin; in most cases, they are not measurably affected by low doses of heparin. The bleeding time is usually unaffected by heparin. 12.3 Pharmacokinetics. AbsorptionHeparin is not absorbed through the gastrointestinal tract and therefore administered via parenteral route. Peak plasma concentration and the onset of action are achieved immediately after intravenous administration. DistributionHeparin is highly bound to antithrombin, fibrinogens, globulins, serum proteases and lipoproteins. The volume of distribution is 0.07 L/kg.Elimination MetabolismHeparin does not undergo enzymatic degradation.ExcretionHeparin is mainly cleared from the circulation by liver and reticuloendothelial cells mediated uptake into extravascular space. Heparin undergoes biphasic clearance, a) rapid saturable clearance (zero order process due to binding to proteins, endothelial cells and macrophage) and b) slower first order elimination. The plasma half-life is dose-dependent and it ranges from 0.5 to h. Specific PopulationsGeriatric patients Patients over 60 years of age, following similar doses of heparin, may have higher plasma levels of heparin and longer activated partial thromboplastin times (APTTs) compared with patients under 60 years of age [see Use in Specific Populations (8.5) ].

CONTRAINDICATIONS SECTION.


4 CONTRAINDICATIONS. The use of Heparin Sodium Injection is contraindicated in patients with the following conditions:History of heparin-induced thrombocytopenia and heparin-induced thrombocytopenia and thrombosis [see Warnings and Precautions (5.3)];Known hypersensitivity to heparin or pork products (e.g., anaphylactoid reactions) [see Adverse Reactions (6.1)];In whom suitable blood coagulation tests, e.g., the whole blood clotting time, partial thromboplastin time, etc., cannot be performed at appropriate intervals (this contraindication refers to full-dose heparin; there is usually no need to monitor coagulation parameters in patients receiving low-dose heparin);An uncontrolled active bleeding state [see Warnings and Precautions (5.2) ], except when this is due to disseminated intravascular coagulation.. History of heparin-induced thrombocytopenia and heparin-induced thrombocytopenia and thrombosis [see Warnings and Precautions (5.3)];. Known hypersensitivity to heparin or pork products (e.g., anaphylactoid reactions) [see Adverse Reactions (6.1)];. In whom suitable blood coagulation tests, e.g., the whole blood clotting time, partial thromboplastin time, etc., cannot be performed at appropriate intervals (this contraindication refers to full-dose heparin; there is usually no need to monitor coagulation parameters in patients receiving low-dose heparin);. An uncontrolled active bleeding state [see Warnings and Precautions (5.2) ], except when this is due to disseminated intravascular coagulation.. Severe thrombocytopenia (4)When suitable blood coagulation tests, e.g., the whole blood clotting time, partial thromboplastin time, etc., cannot be performed at appropriate intervals (4)An uncontrolled active bleeding state, except when this is due to disseminated intravascular coagulation (4). Severe thrombocytopenia (4). When suitable blood coagulation tests, e.g., the whole blood clotting time, partial thromboplastin time, etc., cannot be performed at appropriate intervals (4). An uncontrolled active bleeding state, except when this is due to disseminated intravascular coagulation (4).

DESCRIPTION SECTION.


11 DESCRIPTION. Heparin is heterogeneous group of straight-chain anionic mucopolysaccharides, called glycosaminoglycans, possessing anticoagulant properties. It is composed of polymers of alternating derivations of -D-glucosamido (N-sulfated O-sulfated or N-acetylated) and O-sulfated uronic acid (-L-iduronic acid or -D-glucoronic acid). Structure of heparin sodium (representative subunits):Heparin Sodium Injection, USP is sterile solution of heparin sodium derived from porcine intestinal mucosa, standardized for anticoagulant activity. It is to be administered by intravenous or deep subcutaneous routes. The potency is determined by biological assay using USP reference standard based on units of heparin activity per milligram.Heparin Sodium Injection, USP preserved with Benzyl Alcohol is available in the following concentrations/mL:Heparin SodiumSodium ChlorideBenzyl Alcohol1,000 USP units8.6 mg10.42 mg5,000 USP units7 mg10.42 mg 10,000 USP units5 mg10.42 mgpH 5.0-7.5; sodium hydroxide and/or hydrochloric acid added, if needed, for pH adjustment.Heparin Sodium Injection, USP, preservative-free is available in the following concentrations:Heparin SodiumSodium Chloride5,000 USP units/1 mL7 mg 5,000 USP units/0.5 mL mgpH 5.0-7.5; sodium hydroxide and/or hydrochloric acid added, if needed, for pH adjustment.. chemical structure.

DOSAGE & ADMINISTRATION SECTION.


2 DOSAGE AND ADMINISTRATION. Recommended Adult Dosages:Therapeutic Anticoagulant Effect with Full-Dose Heparin+ (2.4)Deep Subcutaneous (Intrafat) Injection Use different site for each injection Initial Dose5,000 units by intravenous injection, followed by 10,000 to 20,000 units of concentrated solution, subcutaneouslyEvery hoursorEvery 12 hours8,000 to 10,000 units of concentrated solution15,000 to 20,000 units of concentrated solutionIntermittent Intravenous InjectionInitial dose10,000 units, either undiluted or in 50 to 100 mL of 0.9% Sodium Chloride Injection, USPEvery to hours5,000 to 10,000 units, either undiluted or in 50 to 100 mL of 0.9% Sodium Chloride Injection, USPIntravenous InfusionInitial dose5,000 units by intravenous injectionContinuous20,000 to 40,000 units/24 hours in 1000 mL of 0.9% Sodium Chloride Injection, USP (or in any compatible solution) for infusion+ Based on 150 lb (68 kg) patient. Adjust dose based on laboratory monitoring.. Therapeutic Anticoagulant Effect with Full-Dose Heparin+ (2.4). 2.1 Preparation for Administration. Confirm the choice of the correct Heparin Sodium Injection vial to ensure that the mL vial is not confused with catheter lock flush vial or other mL vial of incorrect strength [see Warnings and Precautions (5.1) ]. Confirm the selection of the correct formulation and strength prior to administration of the drug. To lessen this risk, the mL vial includes red cautionary label that extends above the main label. Read the cautionary statement and confirm that you have selected the correct medication and strength. Then locate the Tear Here point on the label, and remove this red cautionary label prior to removing the flip-off cap.When heparin is added to an infusion solution for continuous intravenous administration, invert the container repeatedly to ensure adequate mixing and prevent pooling of the heparin in the solution.Inspect parenteral drug products visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Use only if solution is clear and the seal is intact. Do not use if solution is discolored or contains precipitate.Administer Heparin Sodium Injection by intermittent intravenous injection, intravenous infusion, or deep subcutaneous (intrafat, i.e., above the iliac crest or abdominal fat layer) injection. Do not administer Heparin Sodium Injection by intramuscular injection because of the risk of hematoma at the injection site [see Adverse Reactions (6) ].. 2.2 Instructions for Use ofPrefilled Syringe. CAUTION: Certain glass syringes may malfunction, break or clog when connected to some Needleless Luer Access Devices (NLADs) and needles. This syringe has larger internal syringe tip and an external collar (luer collar). The external collar must remain attached to the syringe. Data show that the syringe achieves acceptable connections with the BD Eclipse(TM) Needle and the Terumo SurGuard2(TM) Safety Needle and with the following non-center post NLADs: Alaris SMARTSITE(TM), B-Braun ULTRASITE(TM), BD-Q SYTE(TM), Maximum MAX PLUS(TM), and B-Braun SAFSITE(TM). The data also show acceptable connections are achieved to the center post ICU Medical CLAVE(TM). However, spontaneous disconnection of this glass syringe from needles and NLADs with leakage of drug product may occur. Assure that the needle or NLAD is securely attached before beginning the injection. Visually inspect the glass syringe-needle or glass syringe-NLAD connection before and during drug administration. Refer to Figure for syringe diagram. Figure 1. Inspect the outer packaging (plastic tube) by verifying:- plastic tube integrity- drug name- drug strength- dose volume- route of administration- expiration date to be sure that the drug has not expired- sterile field applicabilityDo not use if package has been damaged.2. Remove the plastic tube cap of the outer packaging to access the syringe. 3. Remove the syringe from the plastic tube.4. Perform visual inspection on the syringe by verifying:- absence of syringe damage- absence of external particles- absence of internal particles- proper drug color- expiration date to be sure that the drug has not expired- drug name- drug strength- dose volume- route of administration- sterile field applicability5. Push plunger rod slightly to break the stopper loose while tip cap is still on.6. Remove tip cap by twisting it off. (See Figure 2)Figure 7. Discard the tip cap.8. Expel air bubble.9. Adjust dose by expelling extra volume (where applicable) from the syringe into sterile material prior to administration.10. Connect the syringe to appropriate injection connection depending on route of administration. Before injection, ensure that the syringe is securely attached to the needle or needleless luer access device (NLAD).11. Depress plunger rod to deliver medication. Ensure that pressure is maintained on the plunger rod during the entire administration.12. Remove syringe from NLAD (if applicable) and discard into appropriate receptacle. To prevent needle-stick injuries, needles should not be recapped.NOTES:- All steps must be done sequentially- Do not autoclave syringe Do not use this product on sterile field Do not introduce any other fluid into the syringe at any time- This product is for single dose only; discard unused portion. CSFW - corrected smaller from Word. Figure 2. 2.3 Laboratory Monitoring for Efficacy and Safety. Adjust the dosage of Heparin Sodium Injection according to the patients coagulation test results. Dosage is considered adequate when the activated partial thromboplastin time (aPTT) is 1.5 to times normal or when the whole blood clotting time is elevated approximately 2.5 to times the control value. When initiating treatment with Heparin Sodium Injection by continuous intravenous infusion, determine the coagulation status (aPTT, INR, platelet count) at baseline and continue to follow aPTT approximately every hours and then at appropriate intervals thereafter. When the drug is administered intermittently by intravenous injection, perform coagulation tests before each injection during the initiation of treatment and at appropriate intervals thereafter. After deep subcutaneous (intrafat) injections, tests for adequacy of dosage are best performed on samples drawn to hours after the injection.Periodic platelet counts and hematocrits are recommended during the entire course of heparin therapy, regardless of the route of administration.. 2.4 Therapeutic Anticoagulant Effect with Full-Dose Heparin. The dosing recommendations in Table are based on clinical experience. Although dosages must be adjusted for the individual patient according to the results of suitable laboratory tests, the following dosage schedules may be used as guidelines:Table 1: Recommended Adult Full-Dose Heparin Regimens for Therapeutic Anticoagulant EffectMETHOD OFADMINISTRATION FREQUENCY RECOMMENDED DOSE[based on 150 lb (68 kg) patient] Deep Subcutaneous (Intrafat) Injection Initial dose5,000 units by intravenous injection, followed by 10,000 to 20,000 units of concentrated solution, subcutaneously different site should be used for each injection to prevent the development of massive hematoma Every hoursor8,000 to 10,000 units of concentrated solution Every 12 hours15,000 to 20,000 units of concentrated solution Intermittent Intravenous InjectionInitial dose 10,000 units, either undiluted or in 50 to 100 mL of 0.9% Sodium Chloride Injection, USPEvery to hours 5,000 to 10,000 units, either undiluted or in 50 to 100 mL of 0.9% Sodium Chloride Injection, USPIntravenous Infusion Initial dose5,000 units by intravenous injection Continuous20,000 to 40,000 units/24 hours in 1000 mL of 0.9% Sodium Chloride Injection, USP (or in any compatible solution) for infusion. 2.5 Pediatric Use. Do not use benzyl alcohol-preserved drugs in neonates and infants. Use preservative-free Heparin Sodium Injection in neonates and infants [see Warnings and Precautions (5.4) ].There are no adequate and well controlled studies on heparin use in pediatric patients. Pediatric dosing recommendations are based on clinical experience. In general, the following dosage schedule may be used as guideline in pediatric patients:Initial Dose75 to 100 units/kg (Intravenous bolus over 10 minutes) Maintenance DoseInfants: 25 to 30 units/kg/hour; Infants 2 months have the highest requirements (average 28 units/kg/hour)Children 1 year of age: 18 to 20 units/kg/hour; Older children may require less heparin, similar to weight-adjusted adult dosageMonitoringAdjust heparin to maintain APTT of 60 to 85 seconds, assuming this reflects an anti-Factor Xa level of 0.35 to 0.70. 2.6 Cardiovascular Surgery. Patients undergoing total body perfusion for open-heart surgery should receive an initial dose of not less than 150 units of heparin sodium per kilogram of body weight. Frequently, dose of 300 units per kilogram is used for procedures estimated to last less than 60 minutes, or 400 units per kilogram for those estimated to last longer than 60 minutes.. 2.7 Low-Dose Prophylaxis of Postoperative Thromboembolism. The most widely used dosage has been 5,000 units hours before surgery and 5,000 units every to 12 hours thereafter for days or until the patient is fully ambulatory, whichever is longer. Administer the heparin by deep subcutaneous (intrafat, i.e., above the iliac crest or abdominal fat layer, arm, or thigh) injection with fine (25- to 26-gauge) needle to minimize tissue trauma. 2.8 Blood Transfusion. Add 450 USP units to 600 USP units of heparin sodium per 100 mL of whole blood to prevent coagulation. Usually, 7,500 USP units of heparin sodium are added to 100 mL of 0.9% Sodium Chloride Injection, USP (or 75,000 USP units per 1000 mL of 0.9% Sodium Chloride Injection, USP) and mixed; from this sterile solution, mL to mL are added per 100 mL of whole blood.. 2.9 Converting to Warfarin. To ensure continuous anticoagulation when converting from Heparin Sodium Injection to warfarin, continue full heparin therapy for several days until the INR (prothrombin time) has reached stable therapeutic range. Heparin therapy may then be discontinued without tapering [see Drug Interactions (7.1)].. 2.10 Converting to Oral Anticoagulants other than Warfarin. For patients currently receiving intravenous heparin, stop intravenous infusion of heparin sodium immediately after administering the first dose of oral anticoagulant; or for intermittent intravenous administration of heparin sodium, start oral anticoagulant to hours before the time that the next dose of heparin was to have been administered.. 2.11 Extracorporeal Dialysis. Follow equipment manufacturers operating directions carefully. dose of 25 units/kg to 30 units/kg followed by an infusion rate of 1,500 units/hour to 2,000 units/hour is suggested based on pharmacodynamic data if specific manufacturers recommendations are not available.

DOSAGE FORMS & STRENGTHS SECTION.


3 DOSAGE FORMS AND STRENGTHS. Heparin Sodium Injection, USP preserved with benzyl alcohol is available as follows:1,000 USP units/mL single-dose vials5,000 USP units/mL single-dose vials 10,000 USP units/mL single-dose vials30,000 USP units per 30 mL (1,000 USP units/mL) multiple-dose vials50,000 USP units per 10 mL (5,000 USP units/mL) multiple-dose vialsHeparin Sodium Injection, USP preservative-free is available as follows:5,000 USP units/mL single-dose prefilled syringes5,000 USP units/0.5 mL single-dose prefilled syringes. 1,000 USP units/mL single-dose vials. 5,000 USP units/mL single-dose vials 10,000 USP units/mL single-dose vials. 30,000 USP units per 30 mL (1,000 USP units/mL) multiple-dose vials. 50,000 USP units per 10 mL (5,000 USP units/mL) multiple-dose vials. 5,000 USP units/mL single-dose prefilled syringes. 5,000 USP units/0.5 mL single-dose prefilled syringes. Injection (preserved with Benzyl Alcohol)Single-dose Vials1,000 USP units per mL 5,000 USP units per mL 10,000 USP units per mLMultiple-dose Vials30,000 USP units per 30 mL (1,000 USP units per mL)50,000 USP units per 10 mL (5,000 USP units per mL)Injection (Preservative-Free)Single-dose Prefilled Syringes 5,000 USP units per mL5,000 USP units per 0.5 mL. 1,000 USP units per mL 5,000 USP units per mL 10,000 USP units per mL. 30,000 USP units per 30 mL (1,000 USP units per mL). 50,000 USP units per 10 mL (5,000 USP units per mL). 5,000 USP units per mL. 5,000 USP units per 0.5 mL.

DRUG INTERACTIONS SECTION.


7 DRUG INTERACTIONS. Drugs that interfere with platelet aggregation: May induce bleeding (7.2). 7.1 Oral Anticoagulants. Heparin sodium may prolong the one-stage prothrombin time. Therefore, when heparin sodium is given with dicumarol or warfarin sodium, period of at least hours after the last intravenous dose or 24 hours after the last subcutaneous dose should elapse before blood is drawn, if valid prothrombin time is to be obtained.. 7.2 Platelet Inhibitors. Drugs such as NSAIDS (including salicylic acid, ibuprofen, indomethacin, and celecoxib), dextran, phenylbutazone, thienopyridines, dipyridamole, hydroxychloroquine, glycoprotein IIb/IIIa antagonists (including abciximab, eptifibatide, and tirofiban), and others that interfere with platelet-aggregation reactions (the main hemostatic defense of heparinized patients) may induce bleeding and should be used with caution in patients receiving heparin sodium. To reduce the risk of bleeding, reduction in the dose of antiplatelet agent or heparin is recommended. 7.3 Other Interactions. Digitalis, tetracyclines, nicotine or antihistamines may partially counteract the anticoagulant action of heparin sodium. Intravenous nitroglycerin administered to heparinized patients may result in decrease of the partial thromboplastin time with subsequent rebound effect upon discontinuation of nitroglycerin. Careful monitoring of partial thromboplastin time and adjustment of heparin dosage are recommended during coadministration of heparin and intravenous nitroglycerin.Antithrombin III (human) The anticoagulant effect of heparin is enhanced by concurrent treatment with antithrombin III (human) in patients with hereditary antithrombin III deficiency. To reduce the risk of bleeding, reduced dosage of heparin is recommended during treatment with antithrombin III (human).

GERIATRIC USE SECTION.


8.5 Geriatric Use. There are limited adequate and well-controlled studies in patients 65 years and older, however, higher incidence of bleeding has been reported in patients, particularly women, over 60 years of age [see Warnings and Precautions (5.2) ]. Patients over 60 years of age may require lower doses of heparin.Lower doses of heparin may be indicated in these patients [see Clinical Pharmacology (12.3) ].

HOW SUPPLIED SECTION.


16 HOW SUPPLIED/STORAGE AND HANDLING. Heparin Sodium Injection preserved with benzyl alcohol is available in the following strengths and package sizes in single-dose vials:DESCRIPTIONNDC1,000 USP units/mL vial: 1,000 USP units/mL, single-dose0641-0391-37 25 vials: 1,000 USP units/mL, single-dose0641-0391-125,000 USP units/mL vial: 5,000 USP units/mL, single-dose 0641-0400-37 25 vials: 5,000 USP units/mL, single-dose0641-0400-1210,000 USP units/mL vial: 10,000 USP units/mL, single-dose0641-0410-37 25 vials: 10,000 USP units/mL, single-dose0641-0410-12Discard unused portionHeparin Sodium Injection preserved with benzyl alcohol is available in the following strengths and package sizes in multiple-dose vials:DESCRIPTIONNDC1,000 USP units/mL vial: 30,000 USP units/30 mL, multiple-dose 0641-2450-30 25 vials: 30,000 USP units/30 mL, multiple-dose0641-2450-555,000 USP units/mL vial: 50,000 USP units/10 mL, multiple-dose 0641-2460-30 25 vials: 50,000 USP units/10 mL, multiple-dose0641-2460-55Heparin Sodium Injection preservative-free is available in the following strengths and package sizes in single-dose prefilled syringes:DESCRIPTIONNDC5,000 USP units/mL1 Syringe: 5,000 USP units/mL, single-dose0641-6199-0110 Syringes: 5,000 USP units/mL, single-dose0641-6199-10 5,000 USP units/0.5 mL Syringe: 5,000 USP units/0.5 mL, single-dose0641-6204-01 10 Syringes: 5,000 USP units/0.5 mL, single-dose0641-6204-10 Discard unused portion Store at 20-25C (68-77F) [See USP Controlled Room Temperature].

INDICATIONS & USAGE SECTION.


1 INDICATIONS AND USAGE. Heparin Sodium Injection is indicated for:Prophylaxis and treatment of venous thrombosis and pulmonary embolism; Prevention of postoperative deep venous thrombosis and pulmonary embolism in patients undergoing major abdominothoracic surgery or who, for other reasons, are at risk of developing thromboembolic disease;Atrial fibrillation with embolization;Treatment of acute and chronic consumptive coagulopathies (disseminated intravascular coagulation);Prevention of clotting in arterial and cardiac surgery;Prophylaxis and treatment of peripheral arterial embolism.Anticoagulant use in blood transfusions, extracorporeal circulation, and dialysis procedures.. Prophylaxis and treatment of venous thrombosis and pulmonary embolism; Prevention of postoperative deep venous thrombosis and pulmonary embolism in patients undergoing major abdominothoracic surgery or who, for other reasons, are at risk of developing thromboembolic disease;. Atrial fibrillation with embolization;. Treatment of acute and chronic consumptive coagulopathies (disseminated intravascular coagulation);. Prevention of clotting in arterial and cardiac surgery;. Prophylaxis and treatment of peripheral arterial embolism.. Anticoagulant use in blood transfusions, extracorporeal circulation, and dialysis procedures.. HEPARIN SODIUM INJECTION is an anticoagulant indicated for (1)Prophylaxis and treatment of venous thrombosis and pulmonary embolismPrevention of postoperative deep venous thrombosis and pulmonary embolism in patients undergoing major abdominothoracic surgery or who, for other reasons, are at risk of developing thromboembolic diseaseAtrial fibrillation with embolizationTreatment of acute and chronic consumptive coagulopathies (disseminated intravascular coagulation)Prevention of clotting in arterial and cardiac surgeryProphylaxis and treatment of peripheral arterial embolismUse as an anticoagulant in blood transfusions, extracorporeal circulation, and dialysis procedures. Prophylaxis and treatment of venous thrombosis and pulmonary embolism. Prevention of postoperative deep venous thrombosis and pulmonary embolism in patients undergoing major abdominothoracic surgery or who, for other reasons, are at risk of developing thromboembolic disease. Atrial fibrillation with embolization. Treatment of acute and chronic consumptive coagulopathies (disseminated intravascular coagulation). Prevention of clotting in arterial and cardiac surgery. Prophylaxis and treatment of peripheral arterial embolism. Use as an anticoagulant in blood transfusions, extracorporeal circulation, and dialysis procedures.

INFORMATION FOR PATIENTS SECTION.


17 PATIENT COUNSELING INFORMATION. Hemorrhage Inform patients that it may take them longer than usual to stop bleeding, that they may bruise and/or bleed more easily when they are treated with heparin, and that they should report any unusual bleeding or bruising to their physician. Hemorrhage can occur at virtually any site in patients receiving heparin. Fatal hemorrhages have occurred [see Warnings and Precautions (5.2) ].Prior to Surgery Advise patients to inform physicians and dentists that they are receiving heparin before any surgery is scheduled [see Warnings and Precautions (5.2) ].Heparin-Induced Thrombocytopenia Inform patients of the risk of heparin-induced thrombocytopenia (HIT). HIT may progress to the development of venous and arterial thromboses, condition known as heparin-induced thrombocytopenia and thrombosis (HITT). HIT and HITT can occur up to several weeks after the discontinuation of heparin therapy [see Warnings and Precautions (5.3) ].HypersensitivityInform patients that generalized hypersensitivity reactions have been reported. Necrosis of the skin has been reported at the site of subcutaneous injection of heparin [see Warnings and Precautions (5.8), Adverse Reactions (6.1) ].Other MedicationsBecause of the risk of hemorrhage, advise patients to inform their physicians and dentists of all medications they are taking, including non-prescription medications, and before starting any new medication [see Drug Interactions (7.1) ].Manufactured by: Hikma Pharmaceuticals USA Inc.Eatontown, NJ 07724 USARevised February 2020 462-274-16.

MECHANISM OF ACTION SECTION.


12.1 Mechanism of Action. Heparin interacts with the naturally occurring plasma protein, Antithrombin III, to induce conformational change, which markedly enhances the serine protease activity of Antithrombin III, thereby inhibiting the activated coagulation factors involved in the clotting sequence, particularly Xa and IIa. Small amounts of heparin inhibit Factor Xa, and larger amounts inhibit thrombin (Factor IIa). Heparin also prevents the formation of stable fibrin clot by inhibiting the activation of the fibrin stabilizing factor. Heparin does not have fibrinolytic activity; therefore, it will not lyse existing clots.

NONCLINICAL TOXICOLOGY SECTION.


13 NONCLINICAL TOXICOLOGY. 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility. No long-term studies in animals have been performed to evaluate carcinogenic potential of heparin. Also, no reproduction studies in animals have been performed concerning mutagenesis or impairment of fertility.

NURSING MOTHERS SECTION.


8.2 Lactation. Risk SummaryIf available, preservative-free Heparin Sodium Injection is recommended when heparin therapy is needed during lactation. Benzyl alcohol present in maternal serum is likely to cross into human milk and may be orally absorbed by nursing infant. There is no information regarding the presence of Heparin Sodium Injection in human milk, the effects on the breastfed infant, or the effects on milk production. Due to its large molecular weight, heparin is not likely to be excreted in human milk, and any heparin in milk would not be orally absorbed by nursing infant. The developmental and health benefits of breastfeeding should be considered along with the mothers clinical need for Heparin Sodium Injection and any potential adverse effects on the breastfed infant from Heparin Sodium Injection or from the underlying maternal condition [see Use in Specific Populations (8.4) ].

OVERDOSAGE SECTION.


10 OVERDOSAGE. Bleeding is the chief sign of heparin overdosage.Neutralization of Heparin EffectWhen clinical circumstances (bleeding) require reversal of the heparin effect, protamine sulfate (1% solution) by slow infusion will neutralize heparin sodium. No more than 50 mg should be administered, very slowly, in any 10-minute period. Each mg of protamine sulfate neutralizes approximately 100 USP heparin units. The amount of protamine required decreases over time as heparin is metabolized. Although the metabolism of heparin is complex, it may, for the purpose of choosing protamine dose, be assumed to have half-life of about 1/2 hour after intravenous injection.Because fatal reactions often resembling anaphylaxis have been reported with protamine, it should be given only when resuscitation techniques and treatment of anaphylactoid shock are readily available.For additional information consult the labeling of Protamine Sulfate Injection.

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL.


PRINCIPAL DISPLAY PANEL 1,000 USP units/mL vial. NOT forLockFlushRx only1 mL VialNDC 0641-0391-37HeparinSodium Inj., USP1,000USP units/mLFROMPORCINEINTESTINESFOR IV OR SC USENDC 0641-0391-12 Rx only HeparinSodium Injection, USP1,000 USP units/mL For Intravenous orSubcutaneous Use25 1 mL Vials vial. shelfpack.

PEDIATRIC USE SECTION.


8.4 Pediatric Use. There are no adequate and well controlled studies on heparin use in pediatric patients. Pediatric dosing recommendations are based on clinical experience [see Dosage and Administration (2.5) ].Carefully examine all Heparin Sodium Injection vials and syringes to confirm choice of the correct strength prior to administration of the drug. Pediatric patients, including neonates, have died as result of medication errors in which Heparin Sodium Injection vials have been confused with catheter lock flush vials [see Warnings and Precautions (5.1) ].Benzyl Alcohol ToxicityUse preservative-free Heparin Sodium Injection in neonates and infants. Serious adverse reactions including fatal reactions and the gasping syndrome occurred in premature neonates and infants in the neonatal intensive care unit who received drugs containing benzyl alcohol as preservative. In these cases, benzyl alcohol dosages of 99 to 234 mg/kg/day produced high levels of benzyl alcohol and its metabolites in the blood and urine (blood levels of benzyl alcohol were 0.61 to 1.378 mmol/L). Additional adverse reactions included gradual neurological deterioration, seizures, intracranial hemorrhage, hematologic abnormalities, skin breakdown, hepatic and renal failure, hypotension, bradycardia, and cardiovascular collapse. Preterm, low-birth weight infants may be more likely to develop these reactions because they may be less able to metabolize benzyl alcohol.

PHARMACODYNULLMICS SECTION.


12.2 Pharmacodynamics. Various times (activated clotting time, activated partial thromboplastin time, prothrombin time, whole blood clotting time) are prolonged by full therapeutic doses of heparin; in most cases, they are not measurably affected by low doses of heparin. The bleeding time is usually unaffected by heparin.

PHARMACOKINETICS SECTION.


12.3 Pharmacokinetics. AbsorptionHeparin is not absorbed through the gastrointestinal tract and therefore administered via parenteral route. Peak plasma concentration and the onset of action are achieved immediately after intravenous administration. DistributionHeparin is highly bound to antithrombin, fibrinogens, globulins, serum proteases and lipoproteins. The volume of distribution is 0.07 L/kg.Elimination MetabolismHeparin does not undergo enzymatic degradation.ExcretionHeparin is mainly cleared from the circulation by liver and reticuloendothelial cells mediated uptake into extravascular space. Heparin undergoes biphasic clearance, a) rapid saturable clearance (zero order process due to binding to proteins, endothelial cells and macrophage) and b) slower first order elimination. The plasma half-life is dose-dependent and it ranges from 0.5 to h. Specific PopulationsGeriatric patients Patients over 60 years of age, following similar doses of heparin, may have higher plasma levels of heparin and longer activated partial thromboplastin times (APTTs) compared with patients under 60 years of age [see Use in Specific Populations (8.5) ].

PREGNULLNCY SECTION.


8.1 Pregnancy. Risk SummaryThere are no available data on Heparin Sodium Injection use in pregnant women to inform drug-associated risk of major birth defects and miscarriage. In published reports, heparin exposure during pregnancy did not show evidence of an increased risk of adverse maternal or fetal outcomes in humans. No teratogenicity, but early embryo-fetal death was observed in animal reproduction studies with administration of heparin sodium to pregnant rats and rabbits during organogenesis at doses approximately 10 times the maximum recommended human dose (MRHD) of 45,000 units/day [see Data ]. Consider the benefits and risks of Heparin Sodium Injection for the mother and possible risks to the fetus when prescribing Heparin Sodium Injection to pregnant woman.If available, preservative-free Heparin Sodium Injection is recommended when heparin therapy is needed during pregnancy. There are no known adverse outcomes associated with fetal exposure to the preservative benzyl alcohol through maternal drug administration; however, the preservative benzyl alcohol can cause serious adverse events and death when administered intravenously to neonates and infants [see Warnings and Precautions (5.4) ]The background risk of major birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.DataHuman DataThe maternal and fetal outcomes associated with uses of heparin via various dosing methods and administration routes during pregnancy have been investigated in numerous studies. These studies generally reported normal deliveries with no maternal or fetal bleeding and no other complications.Animal DataIn published study conducted in rats and rabbits, pregnant animals received heparin intravenously during organogenesis at dose of 10,000 units/kg/day, approximately 10 times the maximum human daily dose based on body weight. The number of early resorptions increased in both species. There was no evidence of teratogenic effects.

SPL UNCLASSIFIED SECTION.


5.1 Fatal Medication Errors. Do not use Heparin Sodium Injection as catheter lock flush product. Heparin Sodium Injection is supplied in vials and syringes containing various strengths of heparin, including vials that contain highly concentrated solution of 10,000 units in mL. Fatal hemorrhages have occurred in pediatric patients due to medication errors in which mL Heparin Sodium Injection vials were confused with mL catheter lock flush vials. Carefully examine all Heparin Sodium Injection vials and syringes to confirm the correct vial or syringe choice prior to administration of the drug.

USE IN SPECIFIC POPULATIONS SECTION.


8 USE IN SPECIFIC POPULATIONS. Pregnancy: Preservative-free formulation recommended. Limited human data in pregnant women. (8.1)Lactation: Advise females not to breastfeed. (8.2)Pediatric Use: Use preservative-free formulation in neonates and infants. (8.4)Geriatric Use: higher incidence of bleeding reported in patients, particularly women, over 60 years of age. (8.5). Pregnancy: Preservative-free formulation recommended. Limited human data in pregnant women. (8.1). Lactation: Advise females not to breastfeed. (8.2). Pediatric Use: Use preservative-free formulation in neonates and infants. (8.4). Geriatric Use: higher incidence of bleeding reported in patients, particularly women, over 60 years of age. (8.5). 8.1 Pregnancy. Risk SummaryThere are no available data on Heparin Sodium Injection use in pregnant women to inform drug-associated risk of major birth defects and miscarriage. In published reports, heparin exposure during pregnancy did not show evidence of an increased risk of adverse maternal or fetal outcomes in humans. No teratogenicity, but early embryo-fetal death was observed in animal reproduction studies with administration of heparin sodium to pregnant rats and rabbits during organogenesis at doses approximately 10 times the maximum recommended human dose (MRHD) of 45,000 units/day [see Data ]. Consider the benefits and risks of Heparin Sodium Injection for the mother and possible risks to the fetus when prescribing Heparin Sodium Injection to pregnant woman.If available, preservative-free Heparin Sodium Injection is recommended when heparin therapy is needed during pregnancy. There are no known adverse outcomes associated with fetal exposure to the preservative benzyl alcohol through maternal drug administration; however, the preservative benzyl alcohol can cause serious adverse events and death when administered intravenously to neonates and infants [see Warnings and Precautions (5.4) ]The background risk of major birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively.DataHuman DataThe maternal and fetal outcomes associated with uses of heparin via various dosing methods and administration routes during pregnancy have been investigated in numerous studies. These studies generally reported normal deliveries with no maternal or fetal bleeding and no other complications.Animal DataIn published study conducted in rats and rabbits, pregnant animals received heparin intravenously during organogenesis at dose of 10,000 units/kg/day, approximately 10 times the maximum human daily dose based on body weight. The number of early resorptions increased in both species. There was no evidence of teratogenic effects.. 8.2 Lactation. Risk SummaryIf available, preservative-free Heparin Sodium Injection is recommended when heparin therapy is needed during lactation. Benzyl alcohol present in maternal serum is likely to cross into human milk and may be orally absorbed by nursing infant. There is no information regarding the presence of Heparin Sodium Injection in human milk, the effects on the breastfed infant, or the effects on milk production. Due to its large molecular weight, heparin is not likely to be excreted in human milk, and any heparin in milk would not be orally absorbed by nursing infant. The developmental and health benefits of breastfeeding should be considered along with the mothers clinical need for Heparin Sodium Injection and any potential adverse effects on the breastfed infant from Heparin Sodium Injection or from the underlying maternal condition [see Use in Specific Populations (8.4) ].. 8.4 Pediatric Use. There are no adequate and well controlled studies on heparin use in pediatric patients. Pediatric dosing recommendations are based on clinical experience [see Dosage and Administration (2.5) ].Carefully examine all Heparin Sodium Injection vials and syringes to confirm choice of the correct strength prior to administration of the drug. Pediatric patients, including neonates, have died as result of medication errors in which Heparin Sodium Injection vials have been confused with catheter lock flush vials [see Warnings and Precautions (5.1) ].Benzyl Alcohol ToxicityUse preservative-free Heparin Sodium Injection in neonates and infants. Serious adverse reactions including fatal reactions and the gasping syndrome occurred in premature neonates and infants in the neonatal intensive care unit who received drugs containing benzyl alcohol as preservative. In these cases, benzyl alcohol dosages of 99 to 234 mg/kg/day produced high levels of benzyl alcohol and its metabolites in the blood and urine (blood levels of benzyl alcohol were 0.61 to 1.378 mmol/L). Additional adverse reactions included gradual neurological deterioration, seizures, intracranial hemorrhage, hematologic abnormalities, skin breakdown, hepatic and renal failure, hypotension, bradycardia, and cardiovascular collapse. Preterm, low-birth weight infants may be more likely to develop these reactions because they may be less able to metabolize benzyl alcohol.. 8.5 Geriatric Use. There are limited adequate and well-controlled studies in patients 65 years and older, however, higher incidence of bleeding has been reported in patients, particularly women, over 60 years of age [see Warnings and Precautions (5.2) ]. Patients over 60 years of age may require lower doses of heparin.Lower doses of heparin may be indicated in these patients [see Clinical Pharmacology (12.3) ].

WARNINGS AND PRECAUTIONS SECTION.


5 WARNINGS AND PRECAUTIONS. Fatal Medication Errors: Confirm choice of correct strength prior to administration (5.1)Hemorrhage: Fatal cases have occurred. Use caution in conditions with increased risk of hemorrhage (5.2) HIT and HITTS: Monitor for signs and symptoms and discontinue if indicative of HIT and HITTS (5.3)Benzyl Alcohol Toxicity: Do not use benzyl alcohol-preserved drugs in neonates and infants. (5.4)Monitoring: Blood coagulation tests guide therapy for full-dose heparin.Monitor platelet count and hematocrit in all patients receiving heparin (5.5, 5.6). Fatal Medication Errors: Confirm choice of correct strength prior to administration (5.1). Hemorrhage: Fatal cases have occurred. Use caution in conditions with increased risk of hemorrhage (5.2) HIT and HITTS: Monitor for signs and symptoms and discontinue if indicative of HIT and HITTS (5.3). Benzyl Alcohol Toxicity: Do not use benzyl alcohol-preserved drugs in neonates and infants. (5.4). Monitoring: Blood coagulation tests guide therapy for full-dose heparin.. Monitor platelet count and hematocrit in all patients receiving heparin (5.5, 5.6). 5.1 Fatal Medication Errors. Do not use Heparin Sodium Injection as catheter lock flush product. Heparin Sodium Injection is supplied in vials and syringes containing various strengths of heparin, including vials that contain highly concentrated solution of 10,000 units in mL. Fatal hemorrhages have occurred in pediatric patients due to medication errors in which mL Heparin Sodium Injection vials were confused with mL catheter lock flush vials. Carefully examine all Heparin Sodium Injection vials and syringes to confirm the correct vial or syringe choice prior to administration of the drug.. 5.2 Hemorrhage. Avoid using heparin in the presence of major bleeding, except when the benefits of heparin therapy outweigh the potential risks.Hemorrhage can occur at virtually any site in patients receiving heparin. Fatal hemorrhages have occurred. Adrenal hemorrhage (with resultant acute adrenal insufficiency), ovarian hemorrhage, and retroperitoneal hemorrhage have occurred during anticoagulant therapy with heparin [see Adverse Reactions (6.1)]. higher incidence of bleeding has been reported in patients, particularly women, over 60 years of age [see Clinical Pharmacology (12.3)]. An unexplained fall in hematocrit, fall in blood pressure or any other unexplained symptom should lead to serious consideration of hemorrhagic event.Use heparin sodium with caution in disease states in which there is increased risk of hemorrhage, including:Cardiovascular Subacute bacterial endocarditis, severe hypertension.Surgical During and immediately following (a) spinal tap or spinal anesthesia or (b) major surgery, especially involving the brain, spinal cord, or eye.Hematologic Conditions associated with increased bleeding tendencies, such as hemophilia, thrombocytopenia and some vascular purpuras.Patients with hereditary antithrombin III deficiency receiving concurrent antithrombin III therapy The anticoagulant effect of heparin is enhanced by concurrent treatment with antithrombin III (human) in patients with hereditary antithrombin III deficiency. To reduce the risk of bleeding, reduce the heparin dose during concomitant treatment with antithrombin III (human).Gastrointestinal Ulcerative lesions and continuous tube drainage of the stomach or small intestine.Other Menstruation, liver disease with impaired hemostasis.. Cardiovascular Subacute bacterial endocarditis, severe hypertension.. Surgical During and immediately following (a) spinal tap or spinal anesthesia or (b) major surgery, especially involving the brain, spinal cord, or eye.. Hematologic Conditions associated with increased bleeding tendencies, such as hemophilia, thrombocytopenia and some vascular purpuras.. Patients with hereditary antithrombin III deficiency receiving concurrent antithrombin III therapy The anticoagulant effect of heparin is enhanced by concurrent treatment with antithrombin III (human) in patients with hereditary antithrombin III deficiency. To reduce the risk of bleeding, reduce the heparin dose during concomitant treatment with antithrombin III (human).. Gastrointestinal Ulcerative lesions and continuous tube drainage of the stomach or small intestine.. Other Menstruation, liver disease with impaired hemostasis.. 5.3 Heparin-Induced Thrombocytopenia and Heparin-Induced Thrombocytopenia and Thrombosis. Heparin-induced thrombocytopenia (HIT) is serious antibody-mediated reaction. HIT occurs in patients treated with heparin and is due to the development of antibodies to platelet Factor 4-heparin complex that induce in vivo platelet aggregation. HIT may progress to the development of venous and arterial thromboses, condition referred to as heparin-induced thrombocytopenia with thrombosis (HITT). Thrombotic events may also be the initial presentation for HITT. These serious thromboembolic events include deep vein thrombosis, pulmonary embolism, cerebral vein thrombosis, limb ischemia, stroke, myocardial infarction, mesenteric thrombosis, renal arterial thrombosis, skin necrosis, gangrene of the extremities that may lead to amputation, and possibly death. If the platelet count falls below 100,000/mm3 or if recurrent thrombosis develops, promptly discontinue heparin, evaluate for HIT and HITT, and, if necessary, administer an alternative anticoagulant.HIT or HITT can occur up to several weeks after the discontinuation of heparin therapy. Patients presenting with thrombocytopenia or thrombosis after discontinuation of heparin sodium should be evaluated for HIT or HITT.. 5.4 Risk of Serious Adverse Reactions in Infants Due to Benzyl Alcohol Preservative. Serious and fatal adverse reactions including gasping syndrome can occur in neonates and infants treated with benzyl alcohol-preserved drugs, including Heparin Sodium Injection vials. The gasping syndrome is characterized by central nervous system depression, metabolic acidosis, and gasping respirations.When prescribing Heparin Sodium Injection vials in infants consider the combined daily metabolic load of benzyl alcohol from all sources including Heparin Sodium Injection vials (contains 10.42 mg of benzyl alcohol per mL) and other drugs containing benzyl alcohol. The minimum amount of benzyl alcohol at which toxicity may occur is not known [see Use in Specific Populations (8.4)].. 5.5 Thrombocytopenia. Thrombocytopenia in patients receiving heparin has been reported at frequencies up to 30%. It can occur to 20 days (average to 9) following the onset of heparin therapy. Obtain platelet counts before and periodically during heparin therapy. Monitor thrombocytopenia of any degree closely. If the count falls below 100,000/mm3 or if recurrent thrombosis develops, promptly discontinue heparin, evaluate for HIT and HITT, and, if necessary, administer an alternative anticoagulant [see Warnings and Precautions (5.3)]. 5.6 Coagulation Testing and Monitoring. When using full dose heparin regimen, adjust the heparin dose based on frequent blood coagulation tests. If the coagulation test is unduly prolonged or if hemorrhage occurs, discontinue heparin promptly [see Overdosage (10) ]. Periodic platelet counts and hematocrits are recommended during the entire course of heparin therapy, regardless of the route of administration [see Dosage and Administration (2.3) ].. 5.7 Heparin Resistance. Resistance to heparin is frequently encountered in fever, thrombosis, thrombophlebitis, infections with thrombosing tendencies, myocardial infarction, cancer, in postsurgical patients, and patients with antithrombin III deficiency. Close monitoring of coagulation tests is recommended in these cases. Adjustment of heparin doses based on anti-Factor Xa levels may be warranted.. 5.8 Hypersensitivity. Patients with documented hypersensitivity to heparin should be given the drug only in clearly life-threatening situations.Because Heparin Sodium Injection is derived from animal tissue, it should be used with caution in patients with history of allergy.