Trimethoprim (By mouth)

Introduction

Trimethoprim (trye-METH-oh-prim)

Treats urinary tract infections. Primsol® also treats ear infections in children. Belongs to a group of drugs called antibacterials.

Brand Name(s)

There may be other brand names for this medicine.

Trimpex, Primsol

When This Medicine Should Not Be Used

You should not use this medicine if you have had an allergic reaction to trimethoprim, or if you have a certain type of anemia.

How to Use This Medicine

Liquid, Tablet

  • Your doctor will tell you how much of this medicine to use and how often. Do not use more medicine or use it more often than your doctor tells you to.
  • Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.
  • You may take your medicine with food to avoid stomach upset.
  • Keep using this medicine for the full treatment time, even if you feel better after the first few doses. Your infection may not clear up if you stop using the medicine too soon.

If a dose is missed:

  • If you miss a dose or forget to use your medicine, use it as soon as you can. If it is almost time for your next dose, wait until then to use the medicine and skip the missed dose. Do not use extra medicine to make up for a missed dose.

How to Store and Dispose of This Medicine

  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light.
  • Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
  • Keep all medicine away from children and never share your medicine with anyone.

Drugs and Foods to Avoid

Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.

  • Make sure your doctor knows if you are using phenytoin (Dilantin®).

Warnings While Using This Medicine

  • Make sure your doctor knows if you are pregnant or breast feeding, or if you have liver or kidney disease.
  • Make sure any doctor or dentist who treats you knows that you are using this medicine. This medicine may affect the results of certain medical tests.

Possible Side Effects While Using This Medicine

Call your doctor right away if you notice any of these side effects:

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing.
  • Severe rash, hives, or itching.
  • Swollen or sore tongue.
  • Unexplained fever or sore throat.
  • Unusual bleeding or bruising.

If you notice these less serious side effects, talk with your doctor:

  • Muscle twitching.
  • Nausea, diarrhea, or vomiting.

If you notice other side effects that you think are caused by this medicine, tell your doctor

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

Review Date: 2011-02-04 Reviewed By: Keywords: ,
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