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Trimethoprim is an antibiotic in the antifolate class. It blocks a bacterial enzyme needed to make DNA and is mainly used to treat urinary tract infections.

Brief overview of Trimethoprim

Trimethoprim is an antibiotic. It helps stop bacteria from growing by blocking folate production. It is most often used for urinary tract infections.

It can also be used with sulfamethoxazole for broader coverage in other infections. It does not work against viruses and should be used only when a doctor prescribes it.

Detailed therapeutic uses — primary and secondary indications

Primary use is urinary tract infections. It treats simple bladder infections and some kidney infections.

Secondary uses include certain respiratory infections and gynecologic infections, as well as skin infections when caused by susceptible bacteria. In many cases, doctors use trimethoprim alone for UTIs or in combination with sulfamethoxazole for wider coverage.

How Trimethoprim works — mechanism in accessible terms

Trimethoprim blocks an enzyme in bacteria called dihydrofolate reductase. This enzyme helps bacteria make folate, a vitamin they need to grow. Without folate, bacteria cannot make the DNA they need and they stop multiplying.

Humans use folate differently, so the drug mainly acts on bacteria. It does not directly kill human cells.

Key safety points and common side effects

Common side effects include stomach upset, nausea, loss of appetite, diarrhea, and mild rash. Some people have sun sensitivity or itching. Take the medicine with a full glass of water and finish the prescribed course unless your clinician says otherwise.

Seek urgent care for signs of a serious reaction, such as a severe rash, swelling of the face or lips, trouble breathing, severe stomach cramps, dark urine, or yellowing of the skin or eyes. Tell your clinician about kidney problems, pregnancy, breastfeeding, or other medicines you take, as trimethoprim can interact with some drugs.