Sulfamethoxazole/Trimethoprim Dosage

Dosing for Children

The recommended sulfamethoxazole/trimethoprim dose for treating urinary tract infections, ear infections, or Pneumocystis carinii pneumonia in children is based on weight. For Pneumocystis carinii pneumonia prevention, the dose is based on body surface area (which your child's healthcare provider will calculate using your child's weight and height). Sulfamethoxazole/trimethoprim should never be used in children under the age of two months old.

General Information on Dosing With Sulfamethoxazole/Trimethoprim

Some considerations for people taking sulfamethoxazole/trimethoprim include the following:
  • Sulfamethoxazole/trimethoprim comes in tablet or oral suspension (liquid) form. It is taken by mouth, usually twice a day (although it is taken as frequently as four times daily or as infrequently as once daily for certain uses).
  • Sulfamethoxazole/trimethoprim can be taken at any time of the day; however, be sure to take the medication at the same time(s) each day. For instance, if you take it twice daily, it is best to evenly space the doses, taking a dose every 12 hours.
  • Be sure to shake the suspension well just before each dose. It is best to use a measuring device such as a medication spoon or syringe, which are more accurate than kitchen spoons.
  • You can take this medication with food or on an empty stomach. If it bothers your stomach, try taking it with food.
  • For the medication to work properly, it must be taken as prescribed. Sulfamethoxazole/trimethoprim will not work if you stop taking it too soon.
  • If you are unsure about anything related to your dosage or sulfamethoxazole/trimethoprim dosing in general, please talk with your doctor, nurse, or pharmacist.
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Sulfamethoxazole Trimethoprim Information

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