Take orally with a glass of water, with or without food, approximately 30-60 minutes before anticipated sexual activity. A high-fat meal may delay the onset of action.

Sildenafil is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5) in the corpus cavernosum. When sexual stimulation causes local release of nitric oxide (NO), PDE5 inhibition by sildenafil increases cGMP levels, resulting in smooth muscle relaxation and inflow of blood into the corpus cavernosum, thus aiding erection.

• •Concomitant use of nitrates (e.g., nitroglycerin, isosorbide dinitrate) in any form, as it can cause a significant drop in blood pressure.
• •Known hypersensitivity to Sildenafil or any component of the tablet.
• •Patients for whom sexual activity is inadvisable due to cardiovascular status.
• •Recent stroke or myocardial infarction.
• •Severe hepatic impairment, hypotension (<90/50 mmHg), recent stroke or myocardial infarction, and known hereditary degenerative retinal disorders.

Store in a cool, dry place, below 30°C. Protect from light and moisture. Keep out of reach of children.

In studies with healthy volunteers of single doses up to 800 mg, adverse events were similar to those seen at lower doses but incidence rates were increased. In cases of overdose, standard supportive measures should be adopted as required. Renal dialysis is not expected to accelerate clearance as sildenafil is highly protein bound and not eliminated in the urine.

Viamax is not indicated for use in women. There are no adequate and well-controlled studies of sildenafil in pregnant or lactating women.