Sildenafil for pulmonary hypertension can also be known by the brand names Revatio and Grandipam. Clinical trials for MED found minimal side effects. Epistaxis was reported higher in sildenafil-treated patients with a concomitant oral vitamin K antagonist. It is not indicated for children. Store mixed oral liquid in the refrigerator. Box , Mission, KS If your pharmacy does not participate, you may be able to submit a request for a rebate in connection with this Savings Offer. This medicine works best when you take it on an empty stomach an hour before sex.Viagra comes as an oral tablet in different dosages. Discuss with your doctor what’s an appropriate dose for you. For daily use, Goldstein said, the generic form, sildenafil, comes in mg tablets.  · 10 tips to use sildenafil (aka Viagra) effectively. A set of instructions should be given to patients on sildenafil: A minimum wait of 45 minutes to 1 hour is required between taking the tablet. About sildenafil (Viagra) Sildenafil is a medicine used to treat erection problems (erectile dysfunction). Sildenafil is also sometimes used to treat pulmonary hypertension (high blood pressure in the blood vessels that supply the lungs). If you have erection problems sildenafil works by temporarily increasing blood flow to your penis when.