HOW SUPPLIED SECTION.

16 HOW SUPPLIED/STORAGE AND HANDLING. Nitazoxanide Tablets are round, yellow, film-coated tablets debossed with 77 on one side and plain on the other side. Each tablet contains 500 mg of nitazoxanide. The tablets are packaged in HDPE bottles of 12 and 30 tablets.Bottles of 12 tablets NDC 43386-405-12Bottles of 30 tablets NDC 43386-405-03Store the tablets at 25 oC (77 oF); excursions permitted to 15 oC-30 oC (59 oF-86 oF). [See USP Controlled Room Temperature].

INDICATIONS & USAGE SECTION.

1 INDICATIONS AND USAGE. Nitazoxanide Tablets are indicated for the treatment of diarrhea caused by Giardia lamblia or Cryptosporidium parvum in patients 12 years and older. Limitations of UseNitazoxanide Tablets have not been shown to be effective for the treatment of diarrhea caused by Cryptosporidium parvum in HIV-infected or immunodeficient patients see Clinical Studies (14.2)]. Nitazoxanide Tablets is an antiprotozoal indicated for the treatment of diarrhea caused by Giardia lamblia or Cryptosporidium parvum in patients 12 years of age and older (1). Limitations of Use:Nitazoxanide Tablets has not been shown to be effective for the treatment of diarrhea caused by C. parvum in HIV-infected or immunodeficient patients (1).

LACTATION SECTION.

8.2 Lactation. Risk SummaryNo information regarding the presence of nitazoxanide in human milk, the effects on the breastfed infant, or the effects on milk production is available. The development and health benefits of breastfeeding should be considered along with the mothers clinical need for nitazoxanide and any potential adverse effects on the breastfed infant from nitazoxanide or from the underlying maternal condition.

MECHANISM OF ACTION SECTION.

12.1 Mechanism of Action. Nitazoxanide is an antiprotozoal see Microbiology (12.4)].

ADVERSE REACTIONS SECTION.

6 ADVERSE REACTIONS. The most common adverse reactions in >=2% of patients were abdominal pain, headache, chromaturia, and nausea 6.1). To report SUSPECTED ADVERSE REACTIONS, contact Romark at 813-282-8544 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 Clinical Trials Experience. Because clinical trials are conducted under widely varying conditions, adverse reactions rates observed in the clinical trials of drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.The safety of nitazoxanide was evaluated in 2177 HIV-uninfected subjects who received nitazoxanide at the recommended dose for at least three days. In pooled controlled clinical trials involving 536 HIV-uninfected subjects treated with nitazoxanide, the most common adverse reactions were abdominal pain, headache, chromaturia and nausea (>=2%).Safety data were analyzed separately for 280 HIV-uninfected subjects >=12 years of age receiving nitazoxanide at the recommended dose for at least three days in placebo-controlled clinical trials.. 6.2 Postmarketing Experience. The following adverse reactions have been identified during post approval use of nitazoxanide. 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. The following is list of adverse reactions spontaneously reported with Nitazoxanide Tablets which were not included in clinical trial listings:Gastrointestinal disorders: diarrhea, gastroesophageal reflux disease Nervous System disorders: dizziness Respiratory, thoracic and mediastinal disorders: dyspnea Skin and subcutaneous tissue disorders: rash, urticaria.

CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility. CarcinogenesisLong-term carcinogenicity studies have not been conducted.MutagenesisNitazoxanide was not genotoxic in the Chinese hamster ovary (CHO) cell chromosomal aberration assay or the mouse micronucleus assay. Nitazoxanide was genotoxic in one tester strain (TA 100) in the Ames bacterial mutation assay.Impairment of FertilityNitazoxanide did not adversely affect male or female fertility in the rat at 2400 mg/kg/day (approximately 20 times the clinical adult dose adjusted for body surface area).

CLINICAL PHARMACOLOGY SECTION.

12 CLINICAL PHARMACOLOGY. 12.1 Mechanism of Action. Nitazoxanide is an antiprotozoal see Microbiology (12.4)]. 12.3 Pharmacokinetics. AbsorptionSingle Dosing: Following oral administration of Nitazoxanide Tablet, the parent drug, nitazoxanide, is not detected in plasma. The pharmacokinetic parameters of the metabolites, tizoxanide and tizoxanide glucuronide are shown in Table below.Table 1. Mean (+/- SD) plasma pharmacokinetic parameters of tizoxanide and tizoxanide glucuronide following administration of single dose of one 500 mg Nitazoxanide Tablet with food to subjects >=12 years of ageTizoxanideTizoxanide GlucuronideAgeC max (ug/mL) max (hr) AUC (ugohr/mL) max (ug/mL) max (hr) AUC (ugohr/mL) 12 17 years9.1 (6.1)4.0 (1-4)39.5 (24.2)7.3 (1.9)4.0 (2-8)46.5 (18.2)>18 years10.6 (2.0)3.0 (2-4)41.9 (6.0)10.5 (1.4)4.5 (4-6)63.0 (12.3)T max is given as Mean (Range) Multiple dosing:Following oral administration of single Nitazoxanide Tablet every 12 hours for consecutive days, there was no significant accumulation of nitazoxanide metabolites tizoxanide or tizoxanide glucuronide detected in plasma.Bioavailability:Nitazoxanide for oral suspension is not bioequivalent to Nitazoxanide Tablets. The relative bioavailability of the suspension compared to the tablet was 70%.When Nitazoxanide Tablets are administered with food, the AUC of tizoxanide and tizoxanide glucuronide in plasma is increased almost two-fold and the max is increased by almost 50%. Nitazoxanide Tablets were administered with food in clinical trials and hence they are recomended to be administered with food [see Dosage and Administration (2.1)] DistributionIn plasma, more than 99% of tizoxanide is bound to proteins.EliminationMetabolismFollowing oral administration in humans, nitazoxanide is rapidly hydrolyzed to an active metabolite, tizoxanide (desacetyl-nitazoxanide). Tizoxanide then undergoes conjugation, primarily by glucuronidation.ExcretionTizoxanide is excreted in the urine, bile and feces, and tizoxanide glucuronide is excreted in urine and bile. Approximately two-thirds of the oral dose of nitazoxanide is excreted in the feces and one-third in the urine.Specific PopulationsPediatric PatientsThe pharmacokinetics of tizoxanide and tizoxanide glucuronide following administration of Nitazoxanide Tablets in pediatric patients 12-17 years of age are provided above in Table 1.Drug Interaction StudiesIn vitro studies have demonstrated that tizoxanide has no significant inhibitory effect on cytochrome P450 enzymes. 12.4 MICROBIOLOGY. Mechanism of ActionThe antiprotozoal activity of nitazoxanide is believed to be due to interference with the pyruvate:ferredoxin oxidoreductase (PFOR) enzyme-dependent electron transfer reaction which is essential to anaerobic energy metabolism. Studies have shown that the PFOR enzyme from G. lamblia directly reduces nitazoxanide by transfer of electrons in the absence of ferredoxin. The DNA-derived PFOR protein sequence of C. parvum appears to be similar to that of G. lamblia. Interference with the PFOR enzyme-dependent electron transfer reaction may not be the only pathway by which nitazoxanide exhibits antiprotozoal activity. ResistanceA potential for development of resistance by C. parvum or G. lamblia to nitazoxanide has not been examined. Antimicrobial ActivityNitazoxanide and its metabolite, tizoxanide, are active in vitro in inhibiting the growth of (i) sporozoites and oocysts of C. parvum and (ii) trophozoites of G. lamblia. Susceptibility Test MethodsFor protozoa such as C. parvum and G. lamblia, standardized tests for use in clinical microbiology laboratories are not available.

CLINICAL STUDIES SECTION.

14 CLINICAL STUDIES. 14.1 Diarrhea Caused by G. lamblia Diarrhea caused by G. lamblia in adults and adolescents 12 years of age or older: In double-blind, controlled trial (Study 1) conducted in Peru and Egypt in adults and adolescents with diarrhea and with one or more enteric symptoms (e.g., abdominal pain, nausea, vomiting, fever, abdominal distention, loss of appetite, flatulence) caused by G. lamblia, three-day course of treatment with Nitazoxanide Tablets administered 500 mg BID was compared with placebo tablet for days. second double-blind, controlled trial (Study 2) conducted in Egypt in adults and adolescents with diarrhea and with or without enteric symptoms (e.g., abdominal colic, abdominal tenderness, abdominal cramps, abdominal distention, fever, bloody stool) caused by G. lamblia compared Nitazoxanide Tablets administered 500 mg BID for days to placebo tablet. For both of these studies, clinical response was evaluated to days following the end of treatment. clinical response of well was defined as no symptoms, no watery stools and no more than soft stools with no hematochezia within the past 24 hours or no symptoms and no unformed stools within the past 48 hours. The following clinical response rates were obtained: Table 2. Adult and Adolescent Patients with Diarrhea Caused by G. lamblia Clinical Response Rates to Days Post-therapy% (Number of Successes/Total)Nitazoxanide TabletsPlacebo TabletsStudy 185% (46/54) 44% (12/27)Study 2100% (8/8)30% (3/10) Includes all patients randomized with G. lamblia as the sole pathogen. Patients failing to complete the studies were treated as failures. Clinical response rates statistically significantly higher when compared to placebo. Some patients with well clinical responses had G. lamblia cysts in their stool samples to days following the end of treatment. The relevance of stool examination results in these patients is unknown. Patients should be managed based upon clinical response to treatment. 14.2 Diarrhea Caused by C. parvum Diarrhea caused by C. parvum in adults and adolescents 12 years of age or older: In double-blind, controlled trial conducted in Egypt in adults and adolescents with diarrhea and with or without enteric symptoms (e.g., abdominal pain/cramps, nausea, vomiting) caused by C. parvum, three-day course of treatment with Nitazoxanide Tablets administered 500 mg BID was compared with placebo tablet for days. Clinical response was evaluated to days following the end of treatment. clinical response of well was defined as no symptoms, no watery stools and no more than soft stools within the past 24 hours or no symptoms and no unformed stools within the past 48 hours. The following clinical response rates were obtained: Table 3. Clinical Response Rates in Adult and Adolescent Patients to Days Post-therapy (Number of Successes/Total)Nitazoxanide TabletsPlacebo TabletsIntent-to-treat analysis96% (27/28) 41% (11/27) Includes all patients randomized with C. parvum as the sole pathogen. Patients failing to complete the study were treated as failures. Clinical response rates statistically significantly higher when compared to placebo. In second double-blind, placebo-controlled trial of Nitazoxanide Tablets conductd in Egypt in adults and adolescents with diarrhea and with or without enteric symptoms (e.g., addominal colic, abdominal cramps, epigastric pain) caused by C. parvum as the sole pathogen, clinical and parasitological reponse rates showed similar trend to the first study. Clinical response rates, evaluted to days following the end of treatment, were 71% (15/21) in the nitazoxanide group and 42.9% (9/21) in the placebo group. Some patients with well clinical responses had C. parvum oocysts in their stool samples to days following the end of treatment. The relevance of stool examination results in these patients is unknown. Patients should be managed based upon clinical response to treatment.

CONTRAINDICATIONS SECTION.

4 CONTRAINDICATIONS. Hypersensitivity 4.1) 4.1 Hypersensitivity. Nitazoxanide Tablets are contraindicated in patients with prior hypersensitivity to nitazoxanide or any other ingredient in the formulations.

DESCRIPTION SECTION.

11 DESCRIPTION. Nitazoxanide Tablets contain the active ingredient, nitazoxanide, synthetic antiprotozoal for oral administration. Nitazoxanide is light yellow crystalline powder. It is poorly soluble in ethanol and practically insoluble in water. Chemically, nitazoxanide is 2-acetyloxy- N-(5-nitro-2-thiazolyl)benzamide. The molecular formula is 12H 9N 3O 5S and the molecular weight is 307.3. The structural formula is: Nitazoxanide Tablets contain 500 mg of nitazoxanide and the following inactive ingredients: maize starch, pregelatinized corn starch, hydroxypropyl methylcellulose, sucrose, sodium starch glycollate, talc, magnesium stearate, soy lecithin, polyvinyl alcohol, xanthan gum, titanium dioxide, D&C Yellow No. 10 Aluminum Lake, FD&C Yellow No. Aluminum Lake, and FD&C Blue No. Aluminum Lake.. Nitazoxanide Formula.

DOSAGE & ADMINISTRATION SECTION.

2 DOSAGE AND ADMINISTRATION. The recommended dosage of Nitazoxanide Tablets in patient 12 years and older is 500 mg orally every 12 hours with food for days.Nitazoxanide Tablets should not be administered to pediatric patients 11 years of age or younger because single tablet contains greater amount of nitazoxanide than the recommended dosing in this pediatric age group. Nitazoxanide Tablets are not interchangeable with Nitazoxanide for Oral Suspension [see Clinical Pharmacology (12.3)]. The recommended dosage of Nitazoxanide Tablets in patients 12 years and older is 500 mg orally every 12 hours with food for days.Nitazoxanide Tablets should not be administered to pediatric patient 11 years of age or younger 2.1) The recommended dosage of Nitazoxanide Tablets in patients 12 years and older is 500 mg orally every 12 hours with food for days.. Nitazoxanide Tablets should not be administered to pediatric patient 11 years of age or younger 2.1).

DOSAGE FORMS & STRENGTHS SECTION.

3 DOSAGE FORMS AND STRENGTHS. Round, yellow, film-coated tablets debossed with 77 on one side and plain on the other side. Each tablet contains 500 mg of nitazoxanide.. Tablets: 500 mg 3.1).

DRUG INTERACTIONS SECTION.

7 DRUG INTERACTIONS. Competition for binding sites may occur when administered concurrently with other highly plasma protein-bound drugs with narrow therapeutic indices. Monitor for adverse reactions 7). 7.1 Highly Protein Bound Drugs with Narrow Therapeutic Indices. Tizoxanide (the active metabolite of nitazoxanide) is highly bound to plasma protein (>99.9%). Therefore, monitor for adverse reactions when administering nitazoxanide concurrently with other highly plasma protein-bound drugs with narrow therapeutic indices, as competition for binding sites may occur (e.g., warfarin).

GERIATRIC USE SECTION.

8.5 Geriatric Use. Clinical studies of Nitazoxanide Tablets did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. In general, the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy in elderly patients should be considered when prescribing Nitazoxanide Tablets.

MICROBIOLOGY SECTION.

12.4 MICROBIOLOGY. Mechanism of ActionThe antiprotozoal activity of nitazoxanide is believed to be due to interference with the pyruvate:ferredoxin oxidoreductase (PFOR) enzyme-dependent electron transfer reaction which is essential to anaerobic energy metabolism. Studies have shown that the PFOR enzyme from G. lamblia directly reduces nitazoxanide by transfer of electrons in the absence of ferredoxin. The DNA-derived PFOR protein sequence of C. parvum appears to be similar to that of G. lamblia. Interference with the PFOR enzyme-dependent electron transfer reaction may not be the only pathway by which nitazoxanide exhibits antiprotozoal activity. ResistanceA potential for development of resistance by C. parvum or G. lamblia to nitazoxanide has not been examined. Antimicrobial ActivityNitazoxanide and its metabolite, tizoxanide, are active in vitro in inhibiting the growth of (i) sporozoites and oocysts of C. parvum and (ii) trophozoites of G. lamblia. Susceptibility Test MethodsFor protozoa such as C. parvum and G. lamblia, standardized tests for use in clinical microbiology laboratories are not available.

NONCLINICAL TOXICOLOGY SECTION.

13 NONCLINICAL TOXICOLOGY. 13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility. CarcinogenesisLong-term carcinogenicity studies have not been conducted.MutagenesisNitazoxanide was not genotoxic in the Chinese hamster ovary (CHO) cell chromosomal aberration assay or the mouse micronucleus assay. Nitazoxanide was genotoxic in one tester strain (TA 100) in the Ames bacterial mutation assay.Impairment of FertilityNitazoxanide did not adversely affect male or female fertility in the rat at 2400 mg/kg/day (approximately 20 times the clinical adult dose adjusted for body surface area).

OVERDOSAGE SECTION.

10 OVERDOSAGE. Limited information on nitazoxanide overdosage is available. In the event of overdose, gastric lavage may be appropriate soon after oral administration. Patients should be observed and given symptomatic and supportive treatment. There is no specific antidote for overdose with nitazoxanide. Because tizoxanide is highly protein bound (>99.9%), dialysis is unlikely to significantly reduce plasma concentrations of the drug.

PACKAGE LABEL.PRINCIPAL DISPLAY PANEL.

Nitazoxanide Tablets 30 ct Label. NDC 43386-405-03Nitazoxanide Tablets500 mgRx OnlyLUPIN 30 TABLETS. 30 ct container label.

PATIENT MEDICATION INFORMATION SECTION.

17 PATIENT COUNSELING INFORMATION. Advise patients and parents/caregivers of pediatric patients taking Nitazoxanide Tablets of the following information:Dosage and Administration:Nitazoxanide Tablets should be taken with food.Drug-drug Interactions: Avoid concurrent warfarin use.

PEDIATRIC USE SECTION.

8.4 Pediatric Use. The safety and efficacy of Nitazoxanide Tablets for the treatment of diarrhea caused by G. lamblia or C. parvum in pediatric patients 12 to 17 years of age has been established based on three (3) randomized, controlled studies with 47 pediatric subjects treated with Nitazoxanide Tablets see Clinical Studies (14)]. single Nitazoxanide Tablet contains greater amount of nitazoxanide than is recommended for use in pediatric patients 11 years or younger. Therefore, Nitazoxanide Tablets should not be administered to peridatric patients 11 years of age or younger see Dosage and Administration (2)].

PHARMACOKINETICS SECTION.

12.3 Pharmacokinetics. AbsorptionSingle Dosing: Following oral administration of Nitazoxanide Tablet, the parent drug, nitazoxanide, is not detected in plasma. The pharmacokinetic parameters of the metabolites, tizoxanide and tizoxanide glucuronide are shown in Table below.Table 1. Mean (+/- SD) plasma pharmacokinetic parameters of tizoxanide and tizoxanide glucuronide following administration of single dose of one 500 mg Nitazoxanide Tablet with food to subjects >=12 years of ageTizoxanideTizoxanide GlucuronideAgeC max (ug/mL) max (hr) AUC (ugohr/mL) max (ug/mL) max (hr) AUC (ugohr/mL) 12 17 years9.1 (6.1)4.0 (1-4)39.5 (24.2)7.3 (1.9)4.0 (2-8)46.5 (18.2)>18 years10.6 (2.0)3.0 (2-4)41.9 (6.0)10.5 (1.4)4.5 (4-6)63.0 (12.3)T max is given as Mean (Range) Multiple dosing:Following oral administration of single Nitazoxanide Tablet every 12 hours for consecutive days, there was no significant accumulation of nitazoxanide metabolites tizoxanide or tizoxanide glucuronide detected in plasma.Bioavailability:Nitazoxanide for oral suspension is not bioequivalent to Nitazoxanide Tablets. The relative bioavailability of the suspension compared to the tablet was 70%.When Nitazoxanide Tablets are administered with food, the AUC of tizoxanide and tizoxanide glucuronide in plasma is increased almost two-fold and the max is increased by almost 50%. Nitazoxanide Tablets were administered with food in clinical trials and hence they are recomended to be administered with food [see Dosage and Administration (2.1)] DistributionIn plasma, more than 99% of tizoxanide is bound to proteins.EliminationMetabolismFollowing oral administration in humans, nitazoxanide is rapidly hydrolyzed to an active metabolite, tizoxanide (desacetyl-nitazoxanide). Tizoxanide then undergoes conjugation, primarily by glucuronidation.ExcretionTizoxanide is excreted in the urine, bile and feces, and tizoxanide glucuronide is excreted in urine and bile. Approximately two-thirds of the oral dose of nitazoxanide is excreted in the feces and one-third in the urine.Specific PopulationsPediatric PatientsThe pharmacokinetics of tizoxanide and tizoxanide glucuronide following administration of Nitazoxanide Tablets in pediatric patients 12-17 years of age are provided above in Table 1.Drug Interaction StudiesIn vitro studies have demonstrated that tizoxanide has no significant inhibitory effect on cytochrome P450 enzymes.

PREGNANCY SECTION.

8.1 Pregnancy. Risk SummaryThere are no data with nitazoxanide in pregnant women to inform drug-associated risk. No teratogenicity or fetotoxicity was observed in animal reproduction studies with administration of nitazoxanide to pregnant rats and rabbits during organogenesis at exposure 30 and times, respectively, the exposure at the maximum recommended human dose of 500 mg twice daily based on body surface area (BSA).In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.DataAnimal DataNitazoxanide was administered orally to pregnant rats at doses of 0, 200, 800 or 3200 mg/kg/day on gestation days to 15. Nitazoxanide produced no evidence of systemic maternal toxicity when administer once daily via oral gavage to pregnant female rats at levels up to 3200 mg/kg/day during the period of organogenesis In rabbits, nitazoxanide was administered at doses of 0, 25, 50, or 100 mg/kg/day on gestation days to 20. Oral treatment of pregnant rabbits with nitazoxanide during organogenesis resulted in minimal maternal toxicity and no external fetal anomalies.

SPL UNCLASSIFIED SECTION.

4.1 Hypersensitivity. Nitazoxanide Tablets are contraindicated in patients with prior hypersensitivity to nitazoxanide or any other ingredient in the formulations.

USE IN SPECIFIC POPULATIONS SECTION.

8 USE IN SPECIFIC POPULATIONS. 8.1 Pregnancy. Risk SummaryThere are no data with nitazoxanide in pregnant women to inform drug-associated risk. No teratogenicity or fetotoxicity was observed in animal reproduction studies with administration of nitazoxanide to pregnant rats and rabbits during organogenesis at exposure 30 and times, respectively, the exposure at the maximum recommended human dose of 500 mg twice daily based on body surface area (BSA).In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.DataAnimal DataNitazoxanide was administered orally to pregnant rats at doses of 0, 200, 800 or 3200 mg/kg/day on gestation days to 15. Nitazoxanide produced no evidence of systemic maternal toxicity when administer once daily via oral gavage to pregnant female rats at levels up to 3200 mg/kg/day during the period of organogenesis In rabbits, nitazoxanide was administered at doses of 0, 25, 50, or 100 mg/kg/day on gestation days to 20. Oral treatment of pregnant rabbits with nitazoxanide during organogenesis resulted in minimal maternal toxicity and no external fetal anomalies.. 8.2 Lactation. Risk SummaryNo information regarding the presence of nitazoxanide in human milk, the effects on the breastfed infant, or the effects on milk production is available. The development and health benefits of breastfeeding should be considered along with the mothers clinical need for nitazoxanide and any potential adverse effects on the breastfed infant from nitazoxanide or from the underlying maternal condition.. 8.4 Pediatric Use. The safety and efficacy of Nitazoxanide Tablets for the treatment of diarrhea caused by G. lamblia or C. parvum in pediatric patients 12 to 17 years of age has been established based on three (3) randomized, controlled studies with 47 pediatric subjects treated with Nitazoxanide Tablets see Clinical Studies (14)]. single Nitazoxanide Tablet contains greater amount of nitazoxanide than is recommended for use in pediatric patients 11 years or younger. Therefore, Nitazoxanide Tablets should not be administered to peridatric patients 11 years of age or younger see Dosage and Administration (2)]. 8.5 Geriatric Use. Clinical studies of Nitazoxanide Tablets did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. In general, the greater frequency of decreased hepatic, renal, or cardiac function, and of concomitant disease or other drug therapy in elderly patients should be considered when prescribing Nitazoxanide Tablets.. 8.6 Renal and Hepatic Impairment. The pharmacokinetics of nitazoxanide in patients with compromised renal or hepatic function has not been studied.. 8.7 HIV-Infected or Immunodeficient Patients. Nitazoxanide Tablets have not been studied for the treatment of diarrhea caused by G. lamblia in HIV-infected or immunodeficient patients. Nitazoxanide Tablets have not been shown to be superior to placebo for the treatment of diarrhea caused by C. parvum in HIV-infected or immunodeficient patients see Clinical Studies (14)].