Valif 20 Tablet may be taken on an empty stomach or with a meal. It should be strictly taken as advised by your doctor. The medicine will only help you to get an erection if you are sexually stimulated. You should take it about one hour before you plan to have sex. The amount of time it takes to work varies from person to person, but it normally takes between 30 minutes and one hour. Only take it if you need it and it has been prescribed to you by a doctor.

The most common side effects of this medicine are flushing, headache, blurred vision, muscle pain, stomach upset, and rash. Talk to your doctor if the side effects bother you or will not go away.

This medicine is not intended for use by women and men should avoid using any other medicines to treat impotence without talking to a doctor. It can be dangerous to take it along with medicines called nitrates (often given for chest pain). Do not take this medicine if you have severe heart or liver problems, if you have recently had a stroke or heart attack or if you have low blood pressure. Let your doctor know if you suffer from these or any other health problems before taking it. You should not drive if this medicine makes you feel dizzy. Avoid drinking alcohol while taking this medicine as it can lead to side effects.