Viagra pills is a healthcare product prescribed in case of different types of erectile dysfunction that men can have. It is a very effective drug which helps to increase the natural sexual potency. It is necessary to take one pill of Viagra one hour before the sexual intercourse. The drug action usually starts in 30-60 minutes after the intake and lasts for four hours. The better effect is achieved if you take Viagra before your meal. It is not recommended to take Viagra more then one time a day. This healthcare product is prescribed to the patients after the medical examination at a sexual pathologist or urologist, as well as at a physician, and also, in case of any associated diseases, at other specialist. The standard Viagra dosage available at drug stores is 25 mg, 50 mg and 100 mg. The most common Viagra prescription is a daily average dose of 50 mg. Depending on the effect achieved the dosage can be corrected by your doctor.The clinical trials of this healthcare product showed the very low percentage (2,5%) of patients experiencing any Viagra side effects, what proves this drug to be safe for your health. Viagra side effects are mostly experienced in case you undergo some nitrates-containing drugs treatment (like nitroglycerine, isosorbide dinitrate, isosorbide mononitrate, etc). In this case Viagra intake can provoke the considerable arterial blood pressure fall. Thus, if you take any nitrates-containing drugs, make sure to inform your doctor about this fact before you start your Viagra treatment.