Generic name: sulfamethoxazole 800mg, Trimethoprim 160mg
Dosage form: tablet
Medically reviewed on January 29, 2018.
BACTRIM is contraindicated in pediatric patients less than 2 months of age.
Urinary Tract Infections and Shigellosis in Adults and Pediatric Patients, and Acute Otitis Media in Children:
Adults: The usual adult dosage in the treatment of urinary tract infections is 1 BACTRIM DS (double strength) tablet or 2 BACTRIM tablets every 12 hours for 10 to 14 days. An identical daily dosage is used for 5 days in the treatment of shigellosis.
Children: The recommended dose for children with urinary tract infections or acute otitis media is 40 mg/kg sulfamethoxazole and 8 mg/kg trimethoprim per 24 hours, given in two divided doses every 12 hours for 10 days. An identical daily dosage is used for 5 days in the treatment of shigellosis. The following table is a guideline for the attainment of this dosage:
|Weight||Dose–every 12 hours|
|88||40||2 or 1 DS tablet|
For Patients with Impaired Renal Function: When renal function is impaired, a reduced dosage should be employed using the following table:
|Above 30||Usual standard regimen|
|15–30||½ the usual regimen|
|Below 15||Use not recommended|
Acute Exacerbations of Chronic Bronchitis in Adults:
The usual adult dosage in the treatment of acute exacerbations of chronic bronchitis is 1 BACTRIM DS (double strength) tablet or 2 BACTRIM tablets every 12 hours for 14 days.
Pneumocystis Jiroveci Pneumonia:
Treatment: Adults and Children:
The recommended dosage for treatment of patients with documented Pneumocystis jiroveci pneumonia is 75 to 100 mg/kg sulfamethoxazole and 15 to 20 mg/kg trimethoprim per 24 hours given in equally divided doses every 6 hours for 14 to 21 days.11 The following table is a guideline for the upper limit of this dosage:
|Weight||Dose–every 6 hours|
|70||32||2 or 1 DS tablet|
|106||48||3 or 1½ DS tablets|
|141||64||4 or 2 DS tablets|
|176||80||5 or 2½ DS tablets|
For the lower limit dose (75 mg/kg sulfamethoxazole and 15 mg/kg trimethoprim per 24 hours) administer 75% of the dose in the above table.
The recommended dosage for prophylaxis in adults is 1 BACTRIM DS (double strength) tablet daily.12
For children, the recommended dose is 750 mg/m2/day sulfamethoxazole with 150 mg/m2/day trimethoprim given orally in equally divided doses twice a day, on 3 consecutive days per week. The total daily dose should not exceed 1600 mg sulfamethoxazole and 320 mg trimethoprim.13 The following table is a guideline for the attainment of this dosage in children:
|Body Surface Area||Dose–every 12 hours|
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
More about Bactrim (sulfamethoxazole / trimethoprim)
- Bactrim Side Effects
- During Pregnancy
- Dosage Information
- Patient Tips
- Drug Images
- Drug Interactions
- Compare Alternatives
- Support Group
- Pricing & Coupons
- En Español
- 315 Reviews
- Generic Availability
- Drug class: sulfonamides