AZO Standard, a brand name for phenazopyridine hydrochloride, is an oral medication that treats the symptoms of urinary tract irritation, including burning, pain, and feeling the need to urinate frequently or urgently, reports WebMD. The drug affects only the symptoms of the irritation; it does not treat the underlying cause.
Urinary irritation is a condition that requires a doctor's attention in order to discover and treat the cause. Phenazopyridine is a dye that functions as a pain-relieving agent to soothe an irritated urinary tract, a common symptom of urinary tract infections, notes WebMD. Common side effects of this drug include orange or reddish urine, upset stomach, dizziness, and headache. More serious side effects are rare but require evaluation by a medical professional. These include changes in urine output, yellowing of the skin or eyes, chills, fever and vomiting.