Cart. Transfer your prescription for Sildenafil (Generic for Viagra, Oral Tablet) on Amazon Pharmacy. FREE SHIPPING for Prime members.Do not stop taking sildenafil without talking to your doctor. If you ever need emergency medical treatment for a heart problem, the healthcare providers who treat you will need to know when you last took sildenafil. Sildenafil for pulmonary hypertension can also be known by the brand names Revatio and Grandipam. Before taking sildenafil, tell your doctor and pharmacist if you are allergic to sildenafil, any other medications, or any of the ingredients in sildenafil tablet or suspension. What should I do if I forget a dose? Different brands may not work the same way. Ask your healthcare professional how you should dispose of any medicine you do not use. · However, the dose is usually not more than 80 mg 3 times a day. Children 1 year of age and older weighing 45 kilograms (kg) or more—20 mg 3 times a day. Your doctor may adjust your dose as needed and tolerated. However the dose is usually not more than 40 mg 3 times a day. Children 1 year of age and older weighing 20 to 45 kg—20 . Price without insurance: starts at $6 per dose for 10 doses. Doses: 20, 25, 50, and mg. Supply: 30, 90, or days. Sildenafil is the generic form of Viagra and Revatio. It’s chemically. from $ for milliliters Oral Powder For Reconstitution 10 mg/mL sildenafil oral powder for reconstitution from $7, for milliliters Oral Tablet 20 mg sildenafil oral tablet from $ for 10 tablets 25 mg sildenafil oral tablet from $ for 30 tablets 50 mg sildenafil oral tablet from $ for 15 tablets.Liquid sildenafil will usually be made up for you by your pharmacist. For treatment of erectile dysfunction: For oral dosage form tablets : Adults up to 65 years of age—50 milligrams mg as a single dose no more than once a day, 1 hour before sexual intercourse. The dose can be increased to mg or decreased to 25mg depending on its effect. Children 1 year of age and older weighing 45 kilograms kg or more—20 mg 3 times a day. Talk to your doctor if you take too much sildenafil and you’re worried about any of these side effects: headaches. The most common side effects are headaches, feeling sick, indigestion and dizziness. Push the plunger of the syringe, then insert the tip into the bottle while holding the bottle upright on a flat surface.