What is trimethoprim?

Trimethoprim is used to treat bladder or kidney infections, or ear infections caused by certain bacteria.Trimethoprim is an antibiotic that fights bacteria in the body.

Trimethoprim may also be used for purposes not listed in this medication guide.

What is the most important information I should know about trimethoprim?

You should not use trimethoprim if you are allergic to it, or if you have a certain type of anemia caused by a folate (folic acid) deficiency.

Before using trimethoprim, tell your doctor if you have kidney disease, liver disease, or a folic acid deficiency.

Take this medicine for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Skipping doses may also increase your risk of further infection that is resistant to antibiotics. Trimethoprim will not treat a viral infection such as the common cold or flu.

Avoid exposure to sunlight or tanning beds. Trimethoprim can make you sunburn more easily. Wear protective clothing and use sunscreen (SPF 30 or higher) when you are outdoors
.