Prescription onlyLower-cost generic availableClass: Infection


(sulfamethoxazole / trimethoprim)

Prescription onlyLower-cost generic availableClass: Infection
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Kills bacteria.

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Our bottom line

Bactrim (sulfamethoxazole / trimethoprim) is good for treating many bacterial infections and is available as a generic. However, you can be more likely to sunburn.

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  • Widely available as a generic product and in a variety of formulations (tablet, capsule, suspension).
  • Works well to treat many types of bacterial infections
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  • Makes you sensitive to the sun.
  • Can upset your stomach
  • Drink plenty of water or fluids to avoid harming your kidneys
  • May cause birth defects
How it works

Bactrim (sulfamethoxazole / trimethoprim) is a combination antibiotic that contains sulfamethoxazole and trimethoprim. It kills bacteria.

What to expect when you take Bactrim (sulfamethoxazole / trimethoprim) for Infection

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Side effect rates for Bactrim (sulfamethoxazole / trimethoprim)

Risks and Warnings for Bactrim (sulfamethoxazole / trimethoprim)

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  • Like all antibiotics, Bactrim (sulfamethoxazole / trimethoprim) can cause diarrhea. Taking probiotic supplements a few hours after taking Bactrim (sulfamethoxazole / trimethoprim) may help with the diarrhea. If diarrhea worsens or becomes bloody, talk to your doctor right away.

Common concerns from people taking Bactrim (sulfamethoxazole / trimethoprim)

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Kidneys and liver
  • Bactrim (sulfamethoxazole / trimethoprim) can harm your kidneys, especially if you're taking anti-inflammatory pain relievers like Motrin or Advil or other medicines that also affect your kidneys. Make sure to drink plenty of water or fluids while you're taking Bactrim (sulfamethoxazole / trimethoprim).
  • UTI pain gone in 1 day but severe GI symptoms & accelerated heart rate started w/i 24 hrs of 1st dose.