Bactrim is the brand name of an antibiotic used to treat ear and urinary tract infections, bronchitis, some forms of pneumonia, and sinusitis. The active ingredients in Bactrim are sulfamethoxazole and trimethoprim.
Bactrim is available as a tablet or a liquid, both taken orally.
An adult dose of Bactrim to fight sinusitis may range from 160 to 800 mg twice a day, states the American Academy of Family Physicians. Pediatric dosage is formulated based on the child's weight.
Course of Treatment
The course of treatment of sinusitis with Bactrim, according to the AAFP, is usually between 7 and 14 days, depending on the specific doctor or the patient's condition.
Bactrim is significantly less expensive than some other drugs prescribed for sinus infections, according to the American Academy of Family Physicians. More costly medications include Ceftin and Ceclor.
Women who are pregnant or nursing and suffer from sinusitis should consult their doctor before taking Bactrim, according to Drugs.com. The ingredients in Bactrim can pass through breast milk and may harm an infant.