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Augmentin vs. Bactrim

Head-to-head comparisons of medication uses, side effects, warnings, and more.

Key takeaways

Augmentin (amoxicillin/clavulanate) and Bactrim (sulfamethoxazole/trimethoprim) are both antibiotics used to treat bacterial infections, but they belong to different drug classes and work in different ways. Augmentin is a combination of a penicillin antibiotic and a beta-lactamase inhibitor, which helps prevent bacteria from breaking down the antibiotic. It is commonly used for respiratory tract infections, ear infections, sinus infections, and UTIs, and is available in tablet, chewable tablet, and liquid forms. Bactrim, on the other hand, combines a sulfonamide antibiotic with an antifolate, which stops bacteria from making folic acid. It treats UTIs, ear infections, and certain types of pneumonia, and comes in tablet, liquid, and injection forms. Augmentin is safe to use during pregnancy, while Bactrim is not recommended for pregnant individuals. Both medications can cause side effects like nausea and diarrhea, but Bactrim can also make your skin more sensitive to the sun. Additionally, Augmentin should be avoided if you have a penicillin allergy, whereas Bactrim should not be used if you have a sulfa allergy.

Augmentin

(amoxicillin / clavulanate)

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Sulfamethoxazole/trimethoprim

 

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Summary for Augmentin

Prescription only

Augmentin (amoxicillin / clavulanate) is an antibiotic medication. It contains a penicillin and a beta-lactamase inhibitor. This antibiotic treats many types of bacterial infections, like urinary tract infection (UTI), sinus infection, and ear infection, among others. It fights infections by preventing bacteria from protecting themselves from harm. This medication comes as tablets, chewable tablets, and a suspension that are taken by mouth typically two to three times daily. It's approved for use in adults and children. Common side effects include diarrhea, nausea, and rash.

Indications for Augmentin

Pros and Cons for Augmentin

Pros

  • Treats many types of bacterial infections in children and adults
  • Available as a tablet, chewable tablet, and oral suspension
  • Available as a lower-cost generic
  • Safe to use while pregnant and while breastfeeding

Cons

  • Typically need to take 2 or 3 times daily
  • Might not be able to take this antibiotic if you've had a severe penicillin allergy
  • Can cause stomach side effects like nausea, vomiting, and diarrhea

Common Side Effects for Augmentin

Immediate-release tablets, chewable tablets, and suspension

  • Diarrhea or loose stools (9%)
  • Nausea (3%)
  • Skin rash (3%)

Extended-release tablets

  • Diarrhea (15%)
  • Vaginal yeast infection (3%)

Augmentin ES-600 (amoxicillin / clavulanate) suspension

  • Vomiting (7%)
  • Fever (6%)
  • Rash (6%)
  • Upper respiratory tract infection (e.g., common cold; 4%)
  • Diarrhea (4%)

Warnings for Augmentin

  • Severe allergic reactions and skin reactions
  • Liver problems
  • Diarrhea from Clostridioides difficile infection
  • Caution use in people with phenylketonuria (PKU) - for chewable tablets and suspension

Summary for Bactrim

Prescription only

Sulfamethoxazole/trimethoprim (sometimes known as SMZ/TMP) is a combination medication containing an antifolate and sulfa antibiotic. It's used to treat different types of infections, such as urinary tract infections (UTIs), ear infections, and lung infections. This antibiotic has two different brand names, Bactrim and Septra, and it's also available as a lower-cost generic. It's a tablet that's taken by mouth, typically twice daily for most types of infections. This antibiotic also comes as a suspension under the brand name Sulfatrim for people who can't swallow tablets and as an injection for people in the hospital. Common side effects include nausea, diarrhea, and rash.

Indications for Bactrim

Pros and Cons for Bactrim

Pros

  • Treats many types of bacterial infections
  • Can be given to children as young as 2 months old to treat certain infections
  • Available as a lower-cost generic

Cons

  • Can upset your stomach and make your skin more sensitive to the sun
  • Not the best choice for people with liver or kidney problems
  • Not recommended if you're pregnant
  • Can't take if you have a sulfa allergy

Common Side Effects for Bactrim

Warnings for Bactrim

  • Not for use during pregnancy
  • Severe allergic reactions and skin reactions
  • Low platelet counts and risk for bleeding
  • Diarrhea from Clostridioides difficile infection
  • Low sodium levels and high potassium levels
  • Blood cell-related problems
  • Problems with processing phenylalanine - for people with phenylketonuria (PKU) only

Prices with our coupons for Augmentin vs. Bactrim

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Amoxicillin/Potassium Clavulanate20 tablets / 875mg/125mg
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Sulfamethoxazole/Trimethoprim14 tablets / 800mg/160mg
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