ampicillin

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Treats bacterial infections.

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Our bottom line

ampicillin is a cheap antibiotic good for treating many types of bacterial infections, but many bacteria are resistant to it.

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Quick facts about ampicillin
  • Drug class: Infection
  • Rx status: Prescription only
  • Generic status: Generic only

Upsides

  • Treats many types of bacterial infections and has generally few side effects.
  • Available in generic.
  • If you have trouble swallowing pills, ampicillin is available as a capsule and liquid.
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What to expect from ampicillin, on one page

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Downsides

  • You usually have to take ampicillin at least four times a day to treat your infection, which is more frequent than some other antibiotics.
  • ampicillin has to be taken on an empty stomach to increase absorption, which can cause stomach upset.
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What to expect from ampicillin, on one page

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How it works

ampicillin is an antibiotic. It kills bacteria by preventing them from reproducing and making their protective covering.

Quick facts about ampicillin
  • Drug class: Infection
  • Rx status: Prescription only
  • Generic status: Generic only

Used for

  • Urinary tract infections
  • Gastrointestinal tract infections
  • Respiractory tract infections

Dosage forms

  • Pill
  • Liquid
  • Injection
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Prices and coupons

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What to expect when you take ampicillin for Infection

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  • First few hoursHours
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  • Effectiveness
  • Starts to kick in
    Full effects
  • First few hoursHours
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  • Possible side effects
  • Skin rash
  • Diarrhea
  • Superinfection
  • Allergic reaction
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Side effect rates for ampicillin

Risks and Warnings for ampicillin

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    • Higher risk if:
    • Taking ampicillin for a long time

    In rare cases, taking antibiotics like ampicillin can increase your chance of getting a serious bacterial infection that causes severe diarrhea. If you develop diarrhea with loose or bloody stools weeks after you finish the medication, talk to your doctor.