Bactrim Dosage
Generic name: SULFAMETHOXAZOLE 800mg, TRIMETHOPRIM 160mg
Dosage form: tablet
Drug class: Sulfonamides
Medically reviewed by Drugs.com. Last updated on Dec 30, 2024.
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:
Children 2 months of age or older: | ||
---|---|---|
Weight | Dose–every 12 hours | |
lb | kg | Tablets |
22 |
10 |
– |
44 |
20 |
1 |
66 |
30 |
1½ |
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:
Creatinine Clearance (mL/min) |
Recommended Dosage Regimen |
---|---|
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 jiroveciiPneumonia
Treatment
Adults and Children:
The recommended dosage for treatment of patients with documented Pneumocystis jiroveciipneumonia 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. 12The following table is a guideline for the upper limit of this dosage:
Weight |
Dose–every 6 hours |
|
lb |
kg |
Tablets |
18 |
8 |
– |
35 |
16 |
1 |
53 |
24 |
1½ |
70 |
32 |
2 or 1 DS tablet |
88 |
40 |
2½ |
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.
Prophylaxis
Adults:
The recommended dosage for prophylaxis in adults is 1 BACTRIM DS (double strength) tablet daily. 13
Children:
For children, the recommended dose is 750 mg/m 2/day sulfamethoxazole with 150 mg/m 2/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. 14The following table is a guideline for the attainment of this dosage in children:
Body Surface Area | Dose–every 12 hours |
---|---|
(m 2) | Tablets |
0.26 |
– |
0.53 |
½ |
1.06 |
1 |
Traveler’s Diarrhea in Adults
For the treatment of traveler’s diarrhea, the usual adult dosage is 1 BACTRIM DS (double strength) tablet or 2 BACTRIM tablets every 12 hours for 5 days.
Frequently asked questions
- What drugs should be avoided with a sulfa allergy?
- Does Bactrim cause headaches?
- Does Bactrim make you tired?
- How long does it take for a boil to heal while taking Bactrim?
- Can I drink alcohol when taking sulfamethoxazole / trimethoprim DS?
- What dose of co-trimoxazole is used in a patient with a UTI?
More about Bactrim (sulfamethoxazole / trimethoprim)
- Check interactions
- Compare alternatives
- Pricing & coupons
- Reviews (616)
- Drug images
- Side effects
- Patient tips
- During pregnancy
- Generic availability
- Support group
- Drug class: sulfonamides
- En español
Patient resources
Other brands
SMZ-TMP DS, Septra, Septra DS, Sulfatrim, ... +2 more
Professional resources
Other brands
Co-trimoxazole, Septra, Sulfatrim
Related treatment guides
See also:
Augmentin
Augmentin is a prescription antibiotic combining amoxicillin and clavulanate to treat bacterial ...
Triamcinolone
Triamcinolone is used to treat allergies, skin conditions, ulcerative colitis, and arthritis. Learn ...
Botox
Botox is used for cosmetic purposes and to treat overactive bladder symptoms, urinary incontinence ...
Keflex
Keflex (cephalexin) is used to treat infections caused by bacteria, including respiratory ...
Ceftriaxone
Ceftriaxone systemic is used for bacteremia, bacterial endocarditis prevention, bacterial ...
Clindamycin
Clindamycin (Cleocin) is used to treat serious infections caused by bacteria. Includes clindamycin ...
Cephalexin
Cephalexin is a cephalosporin antibiotic used to treat bacterial infections like respiratory, skin ...
Metronidazole
Metronidazole is an antibiotic used to fight bacteria in your body. Learn about side effects ...
Ciprofloxacin
Ciprofloxacin is an antibiotic belong to a group of drugs called fluoroquinolones. Learn about side ...
Doxycycline
Doxycycline is a tetracycline antibiotic used to treat many different bacterial infections such as ...
Further information
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.