Trimethoprim treats urinary tract infections. Finish all your medication even if you start to feel better. Take it with a full glass of water.

Trimethoprim Overview

Reviewed: October 14, 2013

Trimethoprim is a prescription medication used to treat bacterial infections. Trimethoprim belongs to a group of drugs called antibiotics, which help to stop the growth of bacteria in the body.

This medication comes in tablet and oral (by mouth) solution forms and is typically taken 1 to 2 times a day.

Common side effects of trimethoprim include stomach pain, diarrhea, vomiting, and skin rash.

Patient Ratings for Trimethoprim

How was your experience with Trimethoprim?

First, a little about yourself

Tell us about yourself in a few words?

What tips would you provide a friend before taking Trimethoprim?

What are you taking Trimethoprim for?

Choose one
  • Other
  • Aids-related Opportunistic Infections
  • Bacterial Infections
  • Bronchitis
  • Escherichia Coli Infections
  • Eye Infections, Bacterial
  • Pneumonia, Pneumocystis
  • Proteus Infections
  • Staphylococcal Infections
  • Toxoplasmosis
  • Urinary Tract Infections

How long have you been taking it?

Choose one
  • Less than a week
  • A couple weeks
  • A month or so
  • A few months
  • A year or so
  • Two years or more

How well did Trimethoprim work for you?

Did you experience many side effects while taking this drug?

How likely would you be to recommend Trimethoprim to a friend?

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Trimethoprim Brand Names

Trimethoprim may be found in some form under the following brand names:

Trimethoprim Drug Class

Trimethoprim is part of the drug class:

Side Effects of Trimethoprim

Serious side effects have been reported with trimethoprim. See the “Drug Precautions” section.

Common side effects of trimethoprim include stomach pain, diarrhea, vomiting, and skin rash.

This is not a complete list of trimethoprim side effects. Ask your doctor or pharmacist for more information.

Tell your doctor if you have any side effect that bothers you or that does not go away.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.