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Ampicillin is used in the treatment of bacterial infections

How it works

Ampicillin is an antibiotic. It kills the bacteria by attacking their cell wall. Specifically, it prevents the synthesis of a substance in the cell wall called peptidoglycan, which provides the cell wall with the strength required for survival of bacteria in human body.

Common side effects


Available Medicine

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Expert advice

  • Do not take ampicillin with food or milk.
  • Do not start or continue the ampicillin suspension/capsule and consult your doctor if you are allergic (hypersensitive) to ampicillin, penicillin, cephalosporin, any other antibiotic of this class or any other ingredient of suspension/capsule.
  • Do not start or continue the ampicillin suspension/capsule and consult your doctor if you suffer from liver problems ar diabetes.

Frequently asked questions



Is ampicillin/Megapen a prodrug?
No, ampicillin is not a prodrug


Is ampicillin and amoxicillin the same?
Ampicillin and amoxicillin belongs to the same group of penicillin antibiotics, but differ slightly in their uses


Is ampicillin a cephalosporin?
Ampicillin is not a cephalosporin

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Is ampicillin light-sensitive?
Yes, ampicillin is light sensitive it should be kept away from sunlight


Can I take ampicillin for strep throat, tooth infection, sore throat, chlamydial and bacterial vaginitis?
Ampicillin can be used to treat strep throat, tooth infection, sore throat, bacterial vaginitis


Does ampicillin cover anaerobes, listeria?
Ampicillin is used for infections caused by anaerobes and listeria. It is not typically used to treat chlamydia


Can I take ampicillin with Advil (ibuprofen), Tylenol (paracetamol) and Benadryl?
Ampicillin can be taken with paracetamol and Benadryl. Ampicillin when taken with ibuprofen may increase the effects of either drug.

Content on this page was last updated on 13 February, 2017, by Dr. Varun Gupta (MD Pharmacology)