Call us
List of Medications


Ampicillin is a popular antibiotic utilized in the fight against bacteria within the body. As a penicillin antibiotic drug, ampicillin inhibits a bacteria's cell wall growth which achieves the beneficial effect of ultimately killing the bacteria.

How to Use Ampicillin

Ampicillin is often administered orally, typically in capsule form, but the drug can be taken as an infusion. Discuss the options for administering the drug with your physician and compounding pharmacist at Fusion Rx. If taken orally, take this drug with a glass of water. It is recommended to take the drug one half hour before eating a meal or at least 2 hours after you have eaten a meal. Dosage should be exact and on a regular schedule always. Discuss your dosage, schedule, and other medication information with your physician at your initial medical consultation. After your initial physician consultation, follow up questions may be directed to your compounding pharmacist.

Possible Side Effects

Severe allergic reaction known as anaphylaxis is possible in some cases so if you experience trouble breathing or severe, or seemingly severe, hives, seek medical attention immediately. Some more common side effects:

  • Skin Rash
  • Eosinophilia
  • Hives
  • Rash
  • Nausea or Vomiting

If any of the above side effects linger or appear to be worsening, consult with your compounding pharmacist or physician. As there are many potentially serious and/or severe side effects that may be possible with the use of ampicillin, all patients planning to use ampicillin should have a full consultation with their physician before beginning to use ampicillin in any form or at any dosage. The following is by no means a comprehensive or complete list of potentially severe side effects but a few of the commonly seen potentially severe side effects are listed below:

  • Urination Infrequency or None at All
  • Diarrhea
  • Fever
  • Headache with Blistering, Peeling / Red Rash on Skin
  • Chills
  • Flu Symptoms
  • Confusion
  • Agitation / Unusual Thoughts
  • Easy Bruising and/or Bleeding
  • Moderate to Severe Weakness

If you experience any side effects, do not wait, seek medical attention immediately.


Consult with your physician before beginning use of ampicillin if you have allergies to penicillins, betalactams, or other drugs, or if you have experienced any renal impairment or a clostridium difficile infection. Consult with your physician if you are pregnant or planning a pregnancy or are currently breast feeding or planning to begin breast feeding before taking ampicillin.

  • "It is rare to find health professionals who are so willing to educate the patient on what they need to know."

    Clair C. | West Hollywood, CA