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You are here : 3-RX.com > Drugs & Medications > Detailed Drug Information (USP DI) > Penicillins : Side Effects

Penicillins (Systemic)

Penicillins | Before Using | Proper Use | Precautions | Side Effects | Additional Information

Side Effects of This Medicine

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

    Stop taking this medicine and get emergency help immediately if any of the following side effects occur:

      Less common

        Fast or irregular breathing; fever; joint pain; lightheadedness or fainting (sudden); puffiness or swelling around the face; red, scaly skin; shortness of breath; skin rash, hives, itching

    In addition to the side effects mentioned above, check with your doctor immediately if any of the following side effects occur:


        Abdominal or stomach cramps and pain (severe); abdominal tenderness; convulsions (seizures); decreased amount of urine; diarrhea (watery and severe), which may also be bloody; mental depression; nausea and vomiting; pain at place of injection; sore throat and fever; unusual bleeding or bruising; yellow eyes or skin


        Some of the above side effects (severe abdominal or stomach cramps and pain, and watery and severe diarrhea, which may also be bloody) may also occur up to several weeks after you stop taking any of these medicines.

      Rare - For penicillin G procaine only

        Agitation or combativeness; anxiety; confusion; fear of impending death; feeling, hearing, or seeing things that are not real

Other side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. However, check with your doctor if any of the following side effects continue or are bothersome:

    More common

      Diarrhea (mild); headache; sore mouth or tongue; vaginal itching and discharge; white patches in the mouth and/or on the tongue

Other side effects not listed above may also occur in some patients. If you notice any other effects, check with your doctor.

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Penicillins: Precautions


Penicillins: Additional Information

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