Trimethoprim is an antibiotic that fights bacteria in the body.

Trimethoprim is used to treat bladder infection caused by certain bacteria.

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

You should not use this medication if you are allergic to trimethoprim, or if you have any type of anemia (lack of red blood cells).

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

Take this medication for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Trimethoprim will not treat a viral infection such as the common cold or flu.

Avoid exposure to sunlight or artificial UV rays (sunlamps or tanning beds). Trimethoprim can make your skin more sensitive to sunlight and sunburn may result. Use a sunscreen (minimum SPF 15) and wear protective clothing if you must be out in the sun.

You should not use this medication if you are allergic to trimethoprim, or have certain conditions. Be sure your doctor knows if you have any type of anemia (lack of red blood cells).

Before using trimethoprim, tell your doctor if you are allergic to any drugs, or if you have:

• kidney disease;

• liver disease; or

• a folate (folic acid) deficiency.

If you have any of these conditions, you may need a dose adjustment or special tests to safely use trimethoprim.

FDA pregnancy category C. This medication may be harmful to an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant during treatment.

Trimethoprim can pass into breast milk and may harm a nursing baby. Do not use this medication without telling your doctor if you are breast-feeding a baby.