Oral ampicillin

Ampicillin is a penicillin antibacterial drug used to treat bacterial infections. Due to its anti-inflammatory effects, it is used off-label to treat acne.


  • Do not use if you have a known hypersensitivity reaction to penicillin or cephalosporins.
  • Amoxicillin may cause a false-positive reaction for glucose in the urine.
  • Do not lie down after taking this medication. Stay upright for at least 30 minutes.


  • Take medication as directed by your dermatology team.
  • Take medication with a full glass of water. Try to take one-half hour before or two hours after meals.


  • The most common side effects of ampicillin are diarrhea, nausea, vomiting or upset stomachs. Vaginal yeast infections can occur with prolonged use.
  • Uncommon side effects include abdominal pain, rash/hives and mouth/tongue sores. This medication may rarely cause a severe intestinal infection (clostridium-dificile associated diarrhea). Symptoms may include persistent diarrhea, abdominal pain/cramping, and blood/mucus in your stool. This medication should not be taken if you are allergic to penicillin or have infectious mononucleosis. A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.


  • Keep this medication in the container it came in, tightly closed, and out of reach of children.
  • Store it at room temperature and away from light, excess heat, and moisture.