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Viagra (sildenafil) is most popularly prescribed to treat erectile dysfunction, also known as male impotence. This condition affects several millions of men in the world - and the number is growing due to the deteriorating ecological situation and changes in the lifestyles. Taking any other medicines along with Viagra is not recommended as dangerous drug interactions are likely to happen. Make sure you keep this medicine out of the reach of children and other people to whom it was not prescribed. If you have forgotten to take Viagra do not take a double dose as this may make it less efficient or alter its effects.
Although serious side effects are extremely rare, the most common ones include priapism and sudden vision loss. Priapism is a prolonged and painful erection that may be related to taking this medicine and can result in the permanent damage to the tissues of the penis. It's not exactly clear whether another serious side effect - sudden vision loss - is attributed to taking Viagra, as there are a number of factors that increase the likelihood of developing this symptom. Most often it is experienced by people older than 50, smokers, as well as those diagnosed with high blood pressure, high cholesterol and diabetes.