Sildenafil Orodispersible 50mg Rego 4 Tabs is used for erectile dysfunction (impotence) treatment. It affects the response to sexual stimulation. Using a chemical called nitric oxide it enhances smooth muscle relaxation which allows increase blood flow into your penis to achieve and maintain erection. Sildenafil can be used for pulmonary arterial hypertension treating.DirectionsThe recommended dose is 50 mg. It should be taken 30-60 minutes before sexual activity. Based on the side effects of the medication, the dose may be increased to 100mg or decreased to 25 mg. The maximum recommended dose is 100 mg. You shouldn't take Viagra more than once a day. It's not recommended to eat high fat food, grapefruit or drink grapefruit juice.