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# Phenazopyridine Hydrochloride
## Overview
Phenazopyridine is a urinary tract analgesic. It exerts a local anesthetic effect on the mucosa of the urinary tract to provide symptomatic relief of pain, burning, urgency, and frequency. It does not treat the underlying infection.
## Primary Indications
Symptomatic relief of pain, burning, urgency, and frequency arising from irritation of the lower urinary tract mucosa caused by infection, trauma, surgery, endoscopic procedures, or the passage of sounds or catheters.
## Adult Dosing
200 mg orally three times daily after meals. Maximum duration of use is 2 days when used for urinary tract infection (UTI) symptoms.
## Pediatric Dosing
Children 6–12 years: 12 mg/kg/day in 3 divided doses, taken after meals. Duration should not exceed 2 days.
*Note: Safety and efficacy in children younger than 6 years have not been established.*
## Dose Adjustments
**Renal Impairment:** Contraindicated in patients with renal insufficiency (CrCl < 50 mL/min). Risk of accumulation and toxicity is significantly increased.
## Contraindications
* Known hypersensitivity to the drug.
* Renal insufficiency (CrCl < 50 mL/min).
* Severe hepatic insufficiency.
## Adverse Effects
* **Common:** Headache, dizziness, GI disturbances (nausea, vomiting).
* **Serious/Rare:** Hemolytic anemia (especially in G6PD deficiency), methemoglobinemia, skin pigmentation, renal/hepatic toxicity (usually associated with overdose or chronic use).
* **Benign:** Bright orange-red discoloration of urine, feces, and body fluids (may stain contact lenses/fabrics).
## Key Drug Interactions
There are no major clinically significant drug-drug interactions. However, it can interfere with colorimetric laboratory tests (e.g., urine dipsticks for glucose, ketones, or bilirubin) because of its dye properties.
## Monitoring
* Monitor for signs of hypersensitivity or jaundice.
* If symptoms persist beyond 2 days, discontinue use and evaluate for further infection or underlying pathology.
* Patients should be warned about staining of clothing and contact lenses.
## Clinical Pearls
* **Not an Antibiotic:** Must emphasize that this medication treats pain only; it does not cure the infection. Patients must complete their prescribed antibiotic course.
* **G6PD Deficiency:** Use with extreme caution in patients with G6PD deficiency due to the risk of hemolytic anemia.
* **Discoloration:** Inform patients that their urine will turn a bright orange-red color; this is expected and harmless, but may interfere with clinical urine analysis.
* **Short-term only:** Long-term use is not recommended due to the potential for serious adverse effects and the masking of worsening symptoms.
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*Disclaimer: This information is for educational purposes only. Always verify current prescribing information, contraindications, and dosing protocols via official drug monographs (e.g., Lexicomp, Micromedex) or institutional guidelines before prescribing or administering medication.*
