Common side effects of Viagra include: dyspepsia, headache, visual disturbance, and flushing. Other side effects include: nasal congestion. See below for a comprehensive list of adverse effects.
Stop taking Viagra and get emergency medical help if you have: heart attack symptoms–chest pain or pressure, pain spreading to your jaw or shoulder, nausea, sweating; vision changes or sudden vision loss; or erection is painful or lasts longer than 4 hours (prolonged erection can damage the penis). Call your doctor at once if you have: ringing in your ears, or sudden hearing loss; irregular heartbeat; swelling in your hands, ankles, or feet; shortness of breath; seizure (convulsions); or a light-headed feeling, like you might pass out. Common Viagra side effects may include: flushing (warmth, redness, or tingly feeling); headache, dizziness; abnormal vision (blurred vision, changes in color vision) stuffy nose; muscle pain, back pain; or upset stomach.
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