ADVERSE REACTIONS SECTION.

ADVERSE REACTIONS. The following adverse reactions have been observed, but there are not enough data to support an estimate of their frequency.Gastrointestinal: Nausea, vomiting, dry mouth.CNS: Vertigo, headache, mental confusion, especially in the elderly, drowsiness, nervousness.Hematologic: Leukopenia (one case which was reversible upon discontinuation of the drug).Cardiovascular: Tachycardia and palpitation.Allergic: Urticaria and other dermatoses, eosinophilia and hyperpyrexia.Ophthalmic: Increased ocular tension, blurred vision, disturbance in eye accommodation.Renal: Dysuria.

CARCINOGENESIS & MUTAGENESIS & IMPAIRMENT OF FERTILITY SECTION.

Carcinogenesis, Mutagenesis, Impairment of Fertility. Mutagenicity studies and long-term studies in animals to determine the carcinogenic potential of flavoxate hydrochloride have not been performed.

CLINICAL PHARMACOLOGY SECTION.

CLINICAL PHARMACOLOGY. Flavoxate hydrochloride counteracts smooth muscle spasm of the urinary tract and exerts its effect directly on the muscle.In single study of 11 normal male subjects, the time to onset of action was 55 minutes. The peak effect was observed at 112 minutes. 57% of the flavoxate hydrochloride was excreted in the urine within 24 hours.

CONTRAINDICATIONS SECTION.

CONTRAINDICATIONS. Flavoxate hydrochloride is contraindicated in patients who have any of the following obstructive conditions: pyloric or duodenal obstruction, obstructive intestinal lesions or ileus, achalasia, gastrointestinal hemorrhage and obstructive uropathies of the lower urinary tract.

DESCRIPTION SECTION.

DESCRIPTION. Flavoxate hydrochloride tablets contain flavoxate hydrochloride, synthetic urinary tract spasmolytic.Chemically, flavoxate hydrochloride is 2-piperidinoethyl 3-methyl-4-oxo-2-phenyl-4H-1-benzopyran-8-carboxylate hydrochloride. The empirical formula of flavoxate hydrochloride is C24H25NO4oHCl. The molecular weight is 427.94. The structural formula appears below.Each tablet for oral administration contains 100 mg flavoxate hydrochloride. In addition, each tablet contains the following inactive ingredients: colloidal silicon dioxide, corn starch, dibasic calcium phosphate dihydrate, magnesium stearate, hypromellose, polydextrose. titanium dioxide and triacetin.. Chemical Structure.

DOSAGE & ADMINISTRATION SECTION.

DOSAGE AND ADMINISTRATION. Adults and children over 12 years of age. One or two 100 mg tablets or times day. With improvement of symptoms, the dose may be reduced. This drug cannot be recommended for infants and children under 12 years of age because safety and efficacy have not been demonstrated in this age group.

HOW SUPPLIED SECTION.

HOW SUPPLIED. Flavoxate hydrochloride 100 mg tablets are available as white, round biconvex, film-coated tablets, debossed E58 on one side and plain on the other side, and are available in Bottles of 10 NDC 54868-6326-1 Bottles of 90 NDC 54868-6326-0 Store at 20 25C (68 77F) [see USP Controlled Room Temperature]. Dispense contents in tight, light-resistant container.

INDICATIONS & USAGE SECTION.

INDICATIONS AND USAGE. Flavoxate hydrochloride tablets are indicated for symptomatic relief of dysuria, urgency, nocturia, suprapubic pain, frequency and incontinence as may occur in cystitis, prostatitis, urethritis, urethrocystitis/urethrotrigonitis. Flavoxate hydrochloride tablets are not indicated for definitive treatment, but are compatible with drugs used for the treatment of urinary tract infections.

INFORMATION FOR PATIENTS SECTION.

Information for Patients. Patients should be informed that if drowsiness and blurred vision occur, they should not operate motor vehicle or machinery or participate in activities where alertness is required.

MECHANISM OF ACTION SECTION.

Flavoxate hydrochloride counteracts smooth muscle spasm of the urinary tract and exerts its effect directly on the muscle.In single study of 11 normal male subjects, the time to onset of action was 55 minutes. The peak effect was observed at 112 minutes. 57% of the flavoxate hydrochloride was excreted in the urine within 24 hours.

NURSING MOTHERS SECTION.

Nursing Mother. It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when flavoxate hydrochloride is administered to nursing woman.

OVERDOSAGE SECTION.

OVERDOSAGE. The oral LD50 for flavoxate hydrochloride in rats is 4273 mg/kg. The oral LD50 for flavoxate hydrochloride in mice is 1837 mg/kg.It is not known whether flavoxate hydrochloride is dialyzable.

PRECAUTIONS SECTION.

PRECAUTIONS. Information for Patients. Patients should be informed that if drowsiness and blurred vision occur, they should not operate motor vehicle or machinery or participate in activities where alertness is required.. Carcinogenesis, Mutagenesis, Impairment of Fertility. Mutagenicity studies and long-term studies in animals to determine the carcinogenic potential of flavoxate hydrochloride have not been performed.. Pregnancy. Teratogenic Effects Pregnancy Category B. Reproduction studies have been performed in rats and rabbits at doses up to 34 times the human dose and revealed no evidence of impaired fertility or harm to the fetus due to flavoxate hydrochloride. There are, however, no well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.. Nursing Mother. It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when flavoxate hydrochloride is administered to nursing woman.. Pediatric Use. Safety and effectiveness in children below the age of 12 years have not been established.

PREGNANCY SECTION.

Pregnancy. Teratogenic Effects Pregnancy Category B. Reproduction studies have been performed in rats and rabbits at doses up to 34 times the human dose and revealed no evidence of impaired fertility or harm to the fetus due to flavoxate hydrochloride. There are, however, no well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.

TERATOGENIC EFFECTS SECTION.

Teratogenic Effects Pregnancy Category B. Reproduction studies have been performed in rats and rabbits at doses up to 34 times the human dose and revealed no evidence of impaired fertility or harm to the fetus due to flavoxate hydrochloride. There are, however, no well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.