What are the possible side effects of Pfizerpen (Penicillin)?
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Call your doctor at once if you have any of these serious side effects: swelling, bruising, or irritation where the injection was given headache with nausea, vomiting, and tiredness a red, blistering, peeling skin rash chills, fever, swelling, joint or muscle pain, and confusion pale skin, easy bruising or bleeding, unusual weakness seizure (convulsions); or uneven heartbeats Less serious side effects may include: twitching or muscle spasm; or mild skin rash This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect.