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Phenazopyridine is a medication primarily used to alleviate the pain, irritation, burning sensation, and discomfort associated with urinary tract infections (UTIs).

Last Modified: 03 May 2024

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What is Phenazopyridine? 

Phenazopyridine is a medication primarily used to alleviate the pain, irritation, burning sensation, and discomfort associated with urinary tract infections (UTIs). It is a pain reliever that affects the lower part of your urinary tract (bladder and urethra). 

Phenazopyridine's structure is based on an azo dye, which is responsible for its characteristic orange to red color in the urine. As a synthetic compound, it exerts its effect locally on the lining of the urinary tract after being excreted in the urine. 

Global Name

Generic name: Phenazopyridine Hydrochloride
Brand names:  Pyridium, Azo-Standard, Uricalm


What is Phenazopyridine used for? 

Phenazopyridine is used to provide symptomatic relief from the pain, burning sensation, urgency, frequency, and other discomforts caused by irritation of the lower urinary tract. These symptoms may occur due to: 

  • Urinary tract infections 
  • Surgery 
  • Catheter use 
  • Other sources of irritation to the urinary lining 
  • Stones (calculi) 

How do you use Phenazopyridine? 


Phenazopyridine is available in tablet form, typically in 95 mg or 200 mg strengths. 

Dosage information:

  • Adults: The typical dosage is 100-200 mg taken orally three times a day after meals. 
  • Children: Use in pediatric patients is not recommended. 


  • Children: Not recommended for use. 
  • Adults: Suitable for both men and women experiencing urinary discomfort. 
  • Elderlies: May be used with caution, considering renal function. 
  • Pregnancy: Use only if clearly needed and prescribed by a healthcare provider. 
  • Lactation: Not recommended as it can pass into breast milk and cause hemolysis & methemoglobinemia in infants with diagnosed or under-diagnosed G6PD deficiency.

Is there anyone who can’t take Phenazopyridine? 

  • Those with hypersensitivity to the drug 
  • Patients with renal insufficiency 
  • Individuals with hepatic problems 
  • Allergies: An allergy to phenazopyridine or any of its components makes it unsuitable for use. 

Drug Interactions: 

  • May alter the results of urine tests. 
  • Avoid concurrent use with nephrotoxic drugs. 
  • Should not be used in patients with renal insufficiency. 

Side Effects

Common side effects include headache, dizziness, and stomach upset. Phenazopyridine can cause a red-orange or brownish color of the urine which is not harmful but can stain clothing.

Pharmacist Tips

Storage information: 

  • Store at room temperature away from moisture and heat. 

Handling instructions: 

  • Handle with care to avoid staining of skin or clothing. 


Where is Phenazopyridine available in Hong Kong?

Phenazopyridine is a prescription medication that can be prescribed by healthcare providers.



How many days does it take Phenazopyridine to cure UTI?

Phenazopyridine does not cure UTIs; it only relieves the symptoms. Antibiotics are needed to treat the infection itself, and the duration depends on the specific antibiotic prescribed.

How quickly does Phenazopyridine work?

It typically begins to relieve pain within a few hours after a dose. 

Can I take Phenazopyridine for more than two days?

It is usually recommended for short-term use. Consult a healthcare provider if symptoms persist.

Will Phenazopyridine affect my urine test?

Yes, it can alter the appearance and some chemical tests of urine. Inform the testing center if you are taking this medication.

This website provides content related to drug use and medicine for informational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Do not use the information on this website to diagnose or treat a health problem or disease without consulting a qualified healthcare provider. The website's owners and contributors are not liable for any repercussions, adverse effects, or consequences resulting from the use of any medication or information provided herein.

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