Medically reviewed by Jessica Swirble, PharmD
Last updated on 3/27/2024

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

• Brand Name: Bactrim
  
• Generic Name: Sulfamethoxazole-trimethoprim
  
• Uses: Bacterial infection treatment
  
• Drug Class: Combination antibiotic
  
• Availability: Prescription only
  
• Generic Status: Yes
  
• Controlled Substance: No
  
  

Bactrim is a combination antibiotic medication that contains sulfamethoxazole and trimethoprim. It is commonly prescribed to treat bacterial infections such as urinary tract infections, respiratory tract infections, traveler's diarrhea, and certain types of pneumonia.

Bactrim is used to treat conditions such as:

• Urinary tract infections (UTIs)
  
• Respiratory tract infections
  
• Traveler's diarrhea
  
• Pneumonia (specific types)
  
  

It may also be prescribed for other bacterial infections as determined by your healthcare provider.

Bactrim works by inhibiting the production of folic acid in bacteria, which is essential for their growth and survival. By blocking this process, Bactrim effectively kills or stops the growth of bacteria causing the infection.

Bactrim is typically taken orally, with a full glass of water, as directed by your healthcare provider. It can be taken without food. However, taking Bactrim with food or milk may prevent stomach upset and irritation. It is important to follow the prescribed dosage and schedule. Do not skip doses or stop taking Bactrim before completing the full course, even if you feel better.

Consult your healthcare provider for specific instructions on how to take Bactrim properly.

The time it takes to experience improvement in symptoms while taking Bactrim can vary depending on the type and severity of the infection. Some people may start feeling better within a few days, while others may require the full course of treatment to see significant results. It's crucial to complete the prescribed course of Bactrim as directed.

While Bactrim is primarily used for bacterial infections, healthcare providers may sometimes prescribe it off-label for other conditions, such as:

• Acne (in certain cases)
  
• Toxoplasmosis
  
• Prevention of Pneumocystis jirovecii pneumonia (PCP) in certain populations
  
  

Discuss any alternative uses of Bactrim with your healthcare provider.

Bactrim is available in its generic form (sulfamethoxazole-trimethoprim) in the following dosage forms:

• Oral tablets: Available in various strengths (e.g., sulfamethoxazole 400mg/trimethoprim 80mg)
  
• Oral suspension: Available in different concentrations (e.g., sulfamethoxazole 200mg/trimethoprim 40mg per 5 mL)
  
  

The brand name Bactrim has been discontinued. You can only get this medication in its generic form.

Bactrim is a prescription medication. You will need a valid prescription from a licensed healthcare provider to obtain this drug.