Trimethoprim: Use, Side Effect

Trimethoprim is an antibiotic that fights bacteria in the body.

Trimethoprim is used to treat bladder or kidney infections, or ear infections caused by certain bacteria.

Side Effect

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

  • fever, chills, body aches, flu symptoms, sores in your mouth and throat;
  • pale skin, easy bruising, unusual bleeding (nose, mouth, vagina, or rectum), purple or red pinpoint spots under your skin;
  • high potassium (slow heart rate, weak pulse, muscle weakness, tingly feeling); or
  • severe headache with muscle cramps, confusion, weakness, loss of coordination, feeling unsteady, and weak or shallow breathing.

Other common side effects may include:

  • stomach pain, vomiting, diarrhea;
  • sore or swollen tongue; or
  • mild itching or skin rash.

Keyword: trimethoprim.

* The Content is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have regarding a medical condition.