Medically reviewed on March 25, 2018
(fen az oh PEER i deen)
- Phenazopyridine HCl
- Phenazopyridine Hydrochloride
- Phenylazo Diamino Pyridine Hydrochloride
Excipient information presented when available (limited, particularly for generics); consult specific product labeling. [DSC] = Discontinued product
Tablet, Oral, as hydrochloride:
Baridium: 97.2 mg [DSC]
Pyridium: 100 mg, 200 mg
Urinary Pain Relief: 95 mg
Generic: 100 mg, 200 mg
Brand Names: U.S.
- Baridium [OTC] [DSC]
- Urinary Pain Relief [OTC]
- Analgesic, Urinary
An azo dye which exerts local anesthetic or analgesic action on urinary tract mucosa through an unknown mechanism
In the liver and other tissues
Urine (66% as unchanged drug)
Use: Labeled Indications
Dysuria, symptomatic relief: Symptomatic relief of pain, burning, urgency, frequency, and other discomforts arising from irritation of the lower urinary tract mucosa caused by infection, trauma, surgery, endoscopic procedures, or the passage of sounds or catheters.
Hypersensitivity to phenazopyridine or any component of the formulation; renal insufficiency.
Dysuria, symptomatic relief: Oral:
OTC labeling: Two tablets (190 mg) 3 times daily administered with or after meals for up to 2 days.
Rx labeling: 200 mg 3 times daily after meals for 2 days when used concomitantly with an antibacterial agent.
Refer to adult dosing.
Dysuria, symptomatic relief: Children ≥12 years and Adolescents: OTC labeling: Oral: Refer to adult dosing.
Dosing: Renal Impairment
Use is contraindicated.
Dosing: Hepatic Impairment
There are no dosage adjustments provided in the manufacturer’s labeling.
Administer after meals.
Take after meals.
Store at 20°C to 25°C (68°F to 77°F); excursions are permitted between 15°C and 30°C (59°F and 86°F). Protect from light and moisture.
Dapsone (Topical): May enhance the adverse/toxic effect of Methemoglobinemia Associated Agents. Monitor therapy
Nitric Oxide: May enhance the adverse/toxic effect of Methemoglobinemia Associated Agents. Combinations of these agents may increase the likelihood of significant methemoglobinemia. Management: Monitor patients for signs of methemoglobinemia (e.g., hypoxia, cyanosis) when nitric oxide is used in combination with other agents associated with development of methemoglobinemia. Avoid lidocaine/prilocaine. Monitor therapy
Prilocaine: Methemoglobinemia Associated Agents may enhance the adverse/toxic effect of Prilocaine. Combinations of these agents may increase the likelihood of significant methemoglobinemia. Management: Monitor patients for signs of methemoglobinemia (e.g., hypoxia, cyanosis) when prilocaine is used in combination with other agents associated with development of methemoglobinemia. Avoid lidocaine/prilocaine in infants receiving such agents. Monitor therapy
Sodium Nitrite: Methemoglobinemia Associated Agents may enhance the adverse/toxic effect of Sodium Nitrite. Combinations of these agents may increase the likelihood of significant methemoglobinemia. Monitor therapy
Tetracaine (Topical): May enhance the adverse/toxic effect of Methemoglobinemia Associated Agents. Monitor therapy
Phenazopyridine may interfere with glucose oxidase reagents (Clinistix, Tes-Tape) and urine ketone tests (Acetest, Ketostix).
1% to 10%:
Central nervous system: Headache, dizziness
Gastrointestinal: Stomach cramps
<1%, postmarketing, and/or case reports: Acute renal failure, hemolytic anemia, hepatitis, methemoglobinemia, skin pigmentation, skin rash, vertigo
Concerns related to adverse effects:
• Acute renal failure: Acute renal failure has been reported with larger than recommended doses, primarily in patients with preexisting renal disease, although some reports have occurred in patients without preexisting renal disease (Alano 1970; Holmes 2014; Onder 2006). Acute renal failure secondary to phenazopyridine toxicity is usually accompanied by hemolytic anemia, yellow discoloration of the skin, and methemoglobinemia, although acute renal failure can occur in isolation (Holmes 2014). Acute renal failure has also been reported following use of usual recommended doses in patients without preexisting renal impairment (Shahani 2012; Singh 2014).
• Urine discoloration: A reddish-orange discoloration of the urine occurs.
• Yellow discoloration: Drug should be discontinued if skin or sclera develop a yellow color (may indicate drug accumulation due to impaired renal excretion).
• Renal impairment: Use is contraindicated in patients with renal impairment (although a specific degree of impairment is not defined in the manufacturer's labeling). Use in patients with preexisting chronic kidney disease has been associated with acute renal failure, hemolytic anemia, and methemoglobinemia (Chang 2014).
• Elderly: Use with caution in older adults due to potential for accumulation in patients with renal insufficiency.
• G6PD deficiency: Use caution in patients with G6PD deficiency; hemolytic anemia may occur in the setting of chronic overdose. OTC labeling recommends use only when directed by physician.
• Contact lenses: Staining of contact lenses may occur if handled after touching tablets.
• Limitations of use: Does not treat urinary infection, acts only as an analgesic.
• Self-medication (OTC use): When used for self-medication, patients should be instructed to discontinue use if symptoms last for more than 2 days or if an adverse reaction occurs.
• Staining: May stain fabric or clothing.
Pregnancy Risk Factor
Adverse events have not been observed in animal reproduction studies. Phenazopyridine crosses the placenta and can be detected in amniotic fluid (Meyer 1991).
• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)
• Patient may experience headache, nausea, vomiting, or diarrhea. Have patient report immediately to prescriber signs of methemoglobinemia (blue or gray color of the lips, nails, or skin; arrhythmia; seizures; severe dizziness or passing out; severe headache; fatigue; loss of strength and energy; or shortness of breath), signs of liver problems (dark urine, feeling tired, lack of appetite, nausea, abdominal pain, light-colored stools, vomiting, or yellow skin or eyes), severe loss of strength and energy, urinary retention, change in amount of urine passed, or vision changes (HCAHPS).
• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.
Intended Use and Disclaimer: Should not be printed and given to patients. This information is intended to serve as a concise initial reference for health care professionals to use when discussing medications with a patient. You must ultimately rely on your own discretion, experience, and judgment in diagnosing, treating, and advising patients.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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- Drug class: miscellaneous genitourinary tract agents