Procainamide affects the way your heart beats.

Procainamide is used to help keep the heart beating normally in people with certain heart rhythm disorders of the ventricles (the lower chambers of the heart that allow blood to flow out of the heart).

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  • Pronestyl
  • Less common
    Fever and chills
    joint pain or swelling
    pains with breathing
    skin rash or itching
    Rare
    Bleeding, blistering, burning, coldness, discoloration of skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, or warmth at the injection site
    Confusion
    fever or sore mouth, gums, or throat
    hallucinations (seeing, hearing, or feeling things that are not there)
    mental depression
    unusual bleeding or bruising
    unusual tiredness or weakness
    If any of the following symptoms of overdose occur while taking procainamide, get emergency help immediately:

    Symptoms of overdose
    Decrease in urination
    dizziness (severe) or fainting
    drowsiness
    fast or irregular heartbeat
    nausea and vomiting
    Some procainamide side effects may not need any medical attention. As your body gets used to the medicine these side effects may disappear. Your health care professional may be able to help you prevent or reduce these side effects, but do check with them if any of the following side effects continue, or if you are concerned about them:

    More common
    Diarrhea
    hardening or thickening of the skin where the needle is placed
    loss of appetite
    Less common
    Dizziness or lightheadedness
  • (procainamide hydrochloride) Tablets USP and Capsules USP