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Author: Admin | 2025-04-28
Phenazopyridine Tablets Description Phenazopyridine Hydrochloride is a reddish-brown, odorless, slightly bitter, crystalline powder. It has a specific local analgesic effect in the urinary tract, promptly relieving burning and pain. Following is the structural formula: C11H11N5 ∙ HCl M.W. 249.70 Phenazopyridine HCl oral tablets contain the following inactive ingredients: Croscarmellose sodium, colloidal silicon dioxide, hydroxypropyl methyl cellulose, magnesium stearate, maize (corn starch), microcrystalline cellulose, polyethylene glycol, povidone and pregelatinized starch. Phenazopyridine Tablets - Clinical Pharmacology Phenazopyridine hydrochloride is excreted in the urine where it exerts a topical analgesic effect on the mucosa of the urinary tract. This action helps to relieve pain, burning, urgency and frequency. The precise mechanism of action is unknown. PHARMACOKINETICS The pharmacokinetic properties of Phenazopyridine hydrochloride have not been determined. Phenazopyridine and its metabolites are rapidly excreted by the kidneys. In a small number of healthy subjects, 90% of a 600 mg/day oral dose of Phenazopyridine hydrochloride was eliminated in the urine in 24 hours, 41% as unchanged drug and 49% as metabolites. Indications and Usage for Phenazopyridine Tablets Phenazopyridine HCL is indicated for the symptomatic relief of pain, burning, urgency frequency, and other discomforts arising from irritation of the mucosa of the lower urinary tract caused by infection, trauma, surgery, endoscopic procedures, or the passage of sounds or catheters. The use of Phenazopyridine for relief of symptoms should not delay definitive diagnosis and treatment of causative conditions. The drug should be used for symptomatic relief of pain and not as a substitute for specific surgery or antimicrobial therapy. Phenazopyridine is compatible with antimicrobial therapy and can help relieve pain and discomfort during the interval before antimicrobial therapy controls the infection. Treatment of a urinary tract infection with Phenazopyridine should not exceed 2 days. There is no evidence that the combined administration of Phenazopyridine and an antimicrobial provides greater benefit than administration of the antimicrobial alone after 2 days. (See Dosage and Administration.) Contraindications In patients who are hypersensitive to the drug or its ingredients. Phenazopyridine is contraindicated in patients with renal insufficiency, severe liver disease, severe hepatitis or pyelonephritis of pregnancy. It should be used cautiously in the presence of GI disturbances. Warnings Phenazopyridine hydrochloride is reasonably anticipated to be a human carcinogen based on sufficient evidence of carcinogenicity in experimental animals (IARC 1980, 1982, 1987, NCI 1978). When administered in the diet, Phenazopyridine hydrochloride increased the incidences of hepatocellular adenomas and carcinomas in female mice
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