Viagra (sildenafil) is efficient in the treatment of male impotence that can be sometimes caused by a wide array of physical and psychological reasons (diseases, stress etc). Viagra's mechanism of action is purely physical. It is based on increasing the blood flow to the tissues of the penis and preventing the blood from escaping back to the body by inhibiting the activity of PDE5 – a specific enzyme in your body, one of the eleven enzymes discovered so far and responsible for this area. Viagra comes in three different dosages – 25 mg, 50 mg and 100 mg to suit the needs of every single patient taking it. In general, you need to make sure you do not take more of this medicine than prescribed and avoid taking more than one dose of Viagra every 24 hours. Taking more is not going to make your treatment more effective and is not going to provide for a harder erection. Before you start taking Viagra you must report any of the following health conditions to your doctor: personal or family history of Long QT syndrome, liver disease, high or low blood pressure, a bleeding disorder, a blood cell disorder, kidney disease, a stomach ulcer, blood clots, a history of a heart attack, congestive heart failure, physical deformity of the penis, a history of a stroke, and angina. The health conditions mentioned are likely to interfere with the success of your treatment. Serious side effects are very unlikely, and in most cases you will get a few mild side effects, such as heartburn, flu-like symptoms, flushing, headache, stuffy or runny nose, and an upset stomach. However, in some cases you still may experience certain serious side effects that will need to be reported to your health care provider as soon as possible. The following serious side effects can take place: sudden hearing loss, nausea, chest pain, general ill feeling, sweating, shortness of breath, sudden vision loss, irregular heartbeat, prolonged penis erection (priapism), lightheadedness, and swelling of your feet, hands, face etc. Never combine Viagra with nitrate-based drugs (used to treat angina), as this can cause a dangerous drop in blood pressure and lead to fainting, coma and even death. Always take Viagra as prescribed and never exceed the dose recommended to avoid an overdose. An overdose of Viagra can lead to the following symptoms that need to be reported to your local emergency center: chest pain, nausea, irregular heartbeat, lightheadedness or fainting. Never share Viagra with people to whom it was not prescribed, as this may result in unpleasant health effects for these people. Consuming any amounts of alcohol can add to the side effects you may experience while taking this medication and even cause new ones. Since you are unlikely to be on any kind of dosing schedule, if you missed a dose of Viagra – there is nothing that needs to be done. Store this medicine in some dark cool place where it will not be accessed by other people to whom it was not prescribed. Keep out of the reach of children and pets.
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