Sulfamethoxazole-Trimethoprim: A Combination Antibiotic for Bacterial Infections
Sulfamethoxazole-Trimethoprim, often prescribed together as a combination antibiotic, is used to treat a variety of bacterial infections, including urinary tract infections (UTIs), respiratory infections, and gastrointestinal infections. In this article, we’ll discuss its uses, dosages, side effects, and how it works.
What is Sulfamethoxazole-Trimethoprim?
Sulfamethoxazole-Trimethoprim is a combination of two antibiotics: Sulfamethoxazole, a sulfonamide, and Trimethoprim, a dihydrofolate reductase inhibitor. Together, they block the production of folic acid in bacteria, which is necessary for bacterial growth and survival. This makes the combination effective in treating a wide range of bacterial infections.
Indications for Sulfamethoxazole-Trimethoprim
● Urinary Tract Infections (UTIs)
● Respiratory Infections: Such as bronchitis and pneumonia.
● Gastrointestinal Infections: Including traveler’s diarrhea.
● Ear Infections: Otitis media.
Dosage and Administration
Adult Dosage:
● For UTIs: 800 mg/160 mg twice daily for 7-10 days.
● For Pneumonia: 1600 mg/320 mg twice daily for 14-21 days.
Pediatric Dosage:
● For UTIs and Other Infections: 6 mg/kg/day for children over 2 months of age.
Side Effects of Sulfamethoxazole-Trimethoprim
● Common: Nausea, vomiting, rash, photosensitivity.
● Serious: Severe allergic reactions, blood disorders, liver damage.
● Pregnancy Category: Category C (risk cannot be ruled out).
Common Brands in India
● Bactrim
● Cotrimoxazole
● Septran
