penicillin V, ampicillin, amoxicillin, piperacillin, ticarcillin, others (Unasyn, Pipracil, Ticar) (cont.)

Pharmacy Author:
Medical and Pharmacy Editor:

SIDE EFFECTS: Side effects of penicillins include diarrhea, dizziness, heartburn, insomnia, nausea, itching, vomiting, confusion, abdominal pain, easy bruising, bleeding, rash, and allergic reactions. People who are allergic to the cephalosporin class of antibiotics, which are related to the penicillins, for example, cefaclor (Ceclor), cephalexin (Keflex), and cefprozil (Cefzil), may or may not be allergic to penicillins. Serious but rare reactions include seizures, severe allergic reactions (anaphylaxis), and low platelet (thrombocytopenia) or red blood cell count. Penicillins can alter the normal bacteria in the colon and encourage overgrowth of some bacteria such as Clostridium difficile which causes inflammation of the colon (pseudomembranous colitis). Patients who develop signs of pseudomembranous colitis after starting amoxicillin (diarrhea, fever, abdominal pain, and possibly shock) should contact their physician immediately.

Reference: FDA Prescribing Information


Last Editorial Review: 2/19/2014



Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Pill Finder Tool

Need help identifying pills and medications?
Use the pill identifier tool on RxList.


Back to Medications Index

STAY INFORMED

Get the Latest health and medical information delivered direct to your inbox!