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Viagra (sildenafil) is the most commonly prescribed erectile dysfunction drug taken by millions of men in the world to deal with their impotence. This condition is diagnosed not only in older people, but also in those with a number of medical conditions that may have contributed to the sexual dysfunction. Viagra will not work unless the patient is sexually stimulated. Take Viagra with a drink of water about 30 minutes before you are planning to have sex. Do not get engaged into sexual activity if your doctor told you to avoid having sex due to health reasons. Avoid drinking alcohol and eating meals high in fat as these two factors can affect the efficiency of Viagra and it may not work for you. In case of a planned surgery make sure you inform your doctor about taking Viagra to make sure you are not administered any drugs that can interfere with it.

Certain side effects may be experienced by patients taking sildenafil, including light sensitivity, headache, diarrhea, facial flushing, heartburn, nosebleeds, tingling or numbness in the feet, arms or legs, muscle aches and some changes in your vision (trouble telling the difference between green and blue). These side effects are commonly mild and tend to go away on their own. If they persist for several days inform your doctor about these side effects to make sure they do not deteriorate. There are other serious side effects that need to be reported to your health care provider immediately: ringing in the ears, blurred vision, sudden vision loss, sudden loss of hearing, shortness of breath, rash, the feeling of burning when urinating, dizziness, fainting, chest pain, lightheadedness and priapism (a prolonged and painful erection that may result in the permanent damage to the tissues of the penis).