Trimethoprim/Sulfamethoxazole (Oral)
Key points
- Septra DS, Bactrim, Septra, Bactrim DS, SMZ-TMP, Sulfatrim, Sulfatrim Pediatric There may be other brand names for this medicine.
- You should not use this medicine if you have had an allergic reaction to trimethoprim, sulfamethoxazole, or any sulfa drug.
- Ask your doctor or pharmacist before using any other medicine, including over-the-counter medicines, vitamins, and herbal products.
- Do not use this medicine if you are pregnant or breast feeding, or in some situations if you have severe liver or kidney problems.
Trimethoprim/Sulfamethoxazole (By Mouth)
Sulfamethoxazole (sul-fa-meth-OX-a-zole), Trimethoprim (trye-METH-oh-prim)
Treats or prevents infections. This medicine is a "sulfa drug" (sulfonamide).
Brand Name(s):
Septra DS, Bactrim, Septra, Bactrim DS, SMZ-TMP, Sulfatrim, Sulfatrim Pediatric
There may be other brand names for this medicine.
When This Medicine Should Not Be Used:
You should not use this medicine if you have had an allergic reaction to trimethoprim, sulfamethoxazole, or any sulfa drug. Do not use this medicine if you are pregnant or breast feeding, or in some situations if you have severe liver or kidney problems. You should not use this medicine if you have anemia (a problem with your blood) caused by not having enough folic acid in your body. This medicine should not be given to infants under 2 months of age.
How to Use This Medicine:
Tablet, Liquid
- Your doctor will tell you how much of this medicine to use and how often. Do not use more medicine or use it more often than your doctor tells you to.
- Measure the oral liquid medicine with a marked measuring spoon, oral syringe, or medicine cup.
- Drink extra fluids so you will pass more urine while you are using this medicine. This will keep your kidneys working well and help prevent kidney problems.
- Keep using this medicine for the full treatment time, even if you feel better after the first few doses. Your infection may not clear up if you stop using the medicine too soon.
If a dose is missed:
- If you miss a dose or forget to use your medicine, use it as soon as you can. If it is almost time for your next dose, wait until then to use the medicine and skip the missed dose. Do not use extra medicine to make up for a missed dose.
How to Store and Dispose of This Medicine:
- Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Do not freeze the oral liquid.
- Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any outdated medicine or medicine no longer needed.
- Keep all medicine away from children and never share your medicine with anyone.
Drugs and Foods to Avoid:
Written and revised by
Andrey Nailor, M.D.
Our doctors write and review articles for accuracy and keep them up to date.
health.am provides general information, not medical advice. Always consult a qualified health professional about your own health.