Viagra (sildenafil) is indicated for the treatment of erectile dysfunction, defined as the inability to achieve and maintain penile erection required for successful intercourse.
For effectiveness of its action Viagra requires sexual stimulation.
The use of Viagra is contraindicated in patients with known hypersensitivity to active substance or any excipient.
Through the influence of the exchange of nitric oxide / cGMP, sildenafil enhances the hypotensive effect of nitrates in their single or prolonged use, so it is a joint appointment with nitric oxide donors, organic nitrates or organic nitrites in any form either permanently or periodically contraindicated.
For the treatment of erectile dysfunction, including sildenafil, should not use patients for whom sexual activity is not advisable (eg, patients with severe cardiovascular disease, such as unstable angina or severe heart failure).
Taking Viagra is contraindicated in patients who have lost vision in one eye due nearterialnu anterior ischemic optic neuropathy, regardless of whether it happened because of previous admission inhibitor PDE5 or not.
Safety of sildenafil has not been studied in these subgroups of patients, and these patients therefore its use is contraindicated in: patients with severe liver dysfunction with hypotension (blood pressure <90/50 mm Hg. Cent.), after a recent stroke or myocardial infarction and known hereditary degenerative retinal disorders such as retinitis pigmentosa (a minority of these patients have genetic disease fosfodyesteraz retina) the use of Viagra is prohibited.
Tablets are intended for oral administration. To achieve the necessary effect of sildenafil sexual arousal is required.
The recommended dose for adults is 50 mg, which should be taken as necessary, for about 1 hour before sexual activity. Given the efficacy and tolerability, the dose may be increased to 100 mg or decreased to 25 mg. The maximum recommended dose is 100 mg. The maximum recommended frequency of admission is once a day. The activeness of Viagra can be detected through a longer period when taken with food intake compared to fasting.