BACTRIM (sulfamethoxazole and trimethoprim) is a synthetic antibacterial combination product available in DS (double strength) tablets, each containing 800 mg sulfamethoxazole and 160 mg. Bactrim DS is a popular antibiotic that treats bacterial infections like urinary tract infections (UTIs), ear infections, and certain types of pneumonia. It’s made up of two medications, sulfamethoxazole and trimethoprim, which work together to kill bacteria and resolve infections in the body. Bactrim DS Tablet is a combination of two medicines: Sulfamethoxazole+Trimethoprim. It is an antibiotic used to treat certain bacterial infections and works by stopping the growth of the bacteria causing the infection. Medscape - Indication-specific dosing for Bactrim, Bactrim DS, Septra, Septra DS, Cotrim, cotrimoxazole, Sulfatrim (trimethoprim, sulfamethoxazole), frequency-based adverse effects. Bactrim is available in tablets in two strengths; 400 mg sulfamethoxazole and 80 mg trimethoprim and the DS form which means double strength, 800 mg sulfamethoxazole and 160 mg trimethoprim. Sulfamethoxazole and trimethoprim is a combination antibiotic used to treat ear infections, urinary tract infections, bronchitis, traveler's diarrhea, shigellosis, and Pneumocystis jiroveci pneumonia. Bactrim and Bactrim DS are antibiotics used to treat ear infections, urinary tract infections, bronchitis, traveler's diarrhea, shigellosis, and Pneumocystis jiroveci pneumonia. Sulfamethoxazole and trimethoprim combination is an antibiotic. It works by eliminating the bacteria that cause many kinds of infections. This medicine will not work for colds, flu, or other virus infections. This medicine is available only with your doctor's prescription. Find patient medical information for Sulfamethoxazole/Trimethoprim (Bactrim, Septra, others) on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user. BACTRIM DS prescription and dosage information for physicians and health care professionals. Pharmacology, adverse reactions, warnings, and BACTRIM DSside effects.