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Drug

Trimethoprim/Sulfamethoxazole

Pronounced

"sull-fuh-meth-OX-uh-zole/try-METH-oh-prim"

Uses

This medication is used to treat a wide variety of bacterial infections. It is also used to treat a certain type of pneumonia (pneumocystis pneumonia) in patients with a weakened immune system. This medication is a combination of 2 antibiotics: sulfamethoxazole and trimethoprim. It works by stopping the growth of bacteria and the pneumocystis fungus.

This medication should not be used by children less than 2 months of age due to the risk of serious side effects.

How to Use This Medication

This medication is given by injection into a vein as directed by your doctor. It is given by slow infusion over 60 to 90 minutes. The dosage is based on your medical condition, weight, and response to treatment.

If you are giving this medication to yourself at home, learn all preparation and usage instructions from your health care professional. Before using, check this product for particles or discoloration. If either is present, do not use the liquid. Learn how to store and discard medical supplies safely.

Drink plenty of fluids while taking this medication to lower the unlikely risk of kidney stones forming, unless your doctor advises you otherwise.

For the best effect, use this antibiotic at evenly spaced times. To help you remember, use this medication at the same time(s) every day.

Continue to use this medication for the full time prescribed, even if symptoms disappear after a few days. Stopping the medication too early may result in a return of the infection.

Tell your doctor if your condition lasts or gets worse.

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Drug information is selected from data included with permission and copyrighted by First DataBank, Inc. This is a summary and does not contain all possible information about this product. For complete information about this product or your specific health needs, ask your healthcare professional. Always seek the advice of your healthcare professional if you have any questions about this product or your medical condition. This information is not intended as individual medical advice and does not substitute for the knowledge and judgment of your healthcare professional. This information does not contain any assurances that this product is safe, effective or appropriate for you.

This information is intended only for residents of the United States. Products sold under the same brand names in other countries may contain different ingredients.

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Information expires December 2025.