Font Size

Medications and Drugs

Brand Names: Primsol, Proloprim

Generic Name: trimethoprim (Pronunciation: trye METH oh prim)

What is trimethoprim (Primsol, Proloprim)?

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.

Trimethoprim 100 mg-BIO

round, white, imprinted with BIOCRAFT, 3 l 4

Trimethoprim 100 mg-TEV

round, white, imprinted with 9 3, 21 58

Trimethoprim 100 mg-WAT

oval, white, imprinted with DAN DAN, 5571

What are the possible side effects of trimethoprim (Primsol, Proloprim)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Call your doctor at once if you have a serious side effect such as:

Less serious side effects may include:

  • nausea, vomiting;
  • sore or swollen tongue; or
  • mild itching or skin rash.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about trimethoprim (Primsol, Proloprim)?

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.

Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Identifier Tool

Need help identifying pills and medications?
Use the pill finder tool on RxList.