Phenazopyridine
Brand: Pyridium, Azo
No boxed warning on the current FDA label.
- Caution
- Turns urine orange and stains contact lenses permanently; limited to 2 days with an antibiotic because it only masks symptoms.
Common side effects
- Bright orange urine
- Stained contact lenses and clothing
- Headache
- Stomach upset
Key interactions
- Its orange color interferes with urine dipstick and urine glucose tests
Counseling points
- Urine will turn bright orange; this is expected
- It relieves symptoms only: finish the antibiotic
- Do not use beyond 2 days alongside an antibiotic
- Remove soft contact lenses; they stain permanently
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High-yield study aid for exam prep, not a substitute for the package insert or a pharmacist’s dispensing reference.