Rarely, a sudden decrease or loss of hearing, sometimes with ringing in the ears and dizziness, may occur. You have a slightly greater chance of developing NAION if you have heart disease, diabetes, high cholesterol, certain other eye problems ("crowded disk"), high blood pressure, if you are over 50, or if you smoke. If this serious problem occurs, stop taking sildenafil and get medical help right away. Rarely, sudden decreased vision, including permanent blindness, in one or both eyes (NAION) may occur. If you have heart problems and experience any of these serious side effects while having sex, stop and get medical help right away: severe dizziness, fainting, chest/jaw/left arm pain, nausea. Sexual activity may put extra strain on your heart, especially if you have heart problems. Many people using this medication do not have serious side effects. Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. To reduce the risk of dizziness and lightheadedness, get up slowly when rising from a sitting or lying position.
If any of these effects last or get worse, tell your doctor or pharmacist promptly. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may also occur. Dizziness, headache, flushing, or stomach upset may occur.
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