Stop using Erectalis 10 and call your doctor at once if you have any of these serious side effects: o Hives o Difficulty breathing o Swelling of your face, lips, tongue, or throat o Dizziness or nausea during sexual activity o Pain, numbness, or tingling in your chest, arms, neck, or jaw o Sudden vision loss o Ringing in your ears, or sudden hearing loss o Chest pain or heavy feeling, pain spreading to the arm or shoulder, nausea, sweating, general ill feeling o Irregular heartbeat o Swelling in your hands, ankles, or feet o Seizure (convulsions) o Feeling light-headed, fainting; or o Painful penis erection that lasts 4 hours or longer Less serious side effects may include: o Warmth or redness in your face, neck, or chest o Stuffy nose, sore throat o Headache o Diarrhea, upset stomach; or o Increased muscle pain, back pain