Medically reviewed by Jessica Swirble, PharmD
Last updated on 5/10/2024

Drug Information | Side Effects | Use & Dosage | Request a Prescription

Bactrim is a combination antibiotic containing sulfamethoxazole and trimethoprim. It is available in various strengths, including:

• Oral tablets (400 mg sulfamethoxazole/80 mg trimethoprim, 800 mg sulfamethoxazole/160 mg trimethoprim)
  
• Oral suspension (200 mg sulfamethoxazole/40 mg trimethoprim per 5 mL)
  
  

The typical starting dose of Bactrim can vary depending on the specific infection being treated, the patient's age, weight, medical history, and other individual factors. It is crucial to follow your healthcare provider's instructions regarding dosage and administration carefully.

For the treatment of bacterial infections, the typical starting doses of Bactrim may be:

• For uncomplicated urinary tract infections (UTIs): One double-strength tablet (800 mg sulfamethoxazole/160 mg trimethoprim) taken orally every 12 hours for 3 days.
  
• For other bacterial infections: Dosage and duration will vary based on the specific condition and severity. Your healthcare provider will determine the most appropriate dose for you.
  
  

Bactrim should be taken with a full glass of water and may be taken with or without food. Taking Bactrim with food may help decrease stomach upset. It is essential to complete the full course of treatment prescribed by your healthcare provider, even if you start to feel better before finishing the medication.

Your healthcare provider will assess your medical history, current medications, and the nature of your infection to determine the most appropriate starting dose and duration of treatment for you.

If you have any questions about your dosage, potential side effects, or need adjustments, contact your healthcare provider for guidance. If you want to to talk to a provider right away, book an online doctor appointment through telehealth platforms like Sesame.

If you miss a dose, take it as soon as you remember it. If it's almost time for another dose of Bactrim, skip the missed dose and take your next dose as scheduled. Do not take or apply a double dose of Bactrim.

Do not discontinue or alter your Bactrim dosage without consulting with your healthcare provider. Follow your healthcare provider's instructions regarding dosing and other recommendations for taking Bactrim.

Store Bactrim as directed by your healthcare provider or pharmacist. Proper storage is essential to maintain the medication's effectiveness. Bactrim should be stored at room temperature, away from excessive heat, light, and moisture.

Keep the medication out of the reach of children and ensure that the container is tightly closed.