What is sulfamethoxazole and trimethoprim?

The combination of sulfamethoxazole and trimethoprim is used as an antibiotic to treat conditions, such as middle ear infections (in children), urinary tract infections, severe bronchitis and complications arising from bacterial infections of the digestive tract, such as travelers' diarrhea. This antibiotic combination also has been helpful in the treatment of pneumonia for people with weakened immune systems. Sulfamethoxazole and trimethoprim is available in the form of a tablet, injection or an oral suspension. In the US, sulfamethoxazole and trimethoprim antibiotics are available under the brand names Bactrim, Septra and Sulfatrim. Sulfamethoxazole and trimethoprim treats bacterial infections and not viral infections, such as the flu.

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