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WebOct 6,  · Drugs and Supplements Sildenafil (Oral Route) Proper Use Drug information provided by: Merative, Micromedex ® Use sildenafil exactly as directed by your doctor. .Hypersensitivity: Hypersensitivity reactions, including rash, urticaria, anaphylactic reaction, and anaphylactic shock, have been reported. This medicine usually begins to work for erectile dysfunction within 30 minutes after taking it. In vitro studies have suggested a decreased effect on platelet aggregation. If too much is used, the chance of side effects is increased. Patient Education What is this drug used for? Do not press on the plunger of the syringe.WebMar 3,  · Sildenafil tablets for erectile dysfunction come in different strengths ranging from 25mg to mg. The usual dose is 50mg, when you need it. Do not take it more . WebSep 12,  · It’s a prescription drug that’s used in adult males* with ED. With ED, you have trouble getting or keeping an erection. To find out more about how Viagra is used . WebFeb 17,  · Renal impairment: Use Viagra with caution in patients with renal impairment; dose adjustment may be needed; use lowest starting dose (25 mg) in severe dysfunction .The amount of medicine that you take depends on the strength of the medicine. Store mixed oral liquid in the refrigerator. A long-term use trial in pediatric patients showed increased mortality in the higher dose groups 20 to 80 mg [depending upon weight] 3 times per day after 2 years of use Barst a; Barst b. The dose can be increased to mg or decreased to 25mg depending on its effect. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 times a day. At the time you take the tablet, you can maximise your potential for a good first experience by: Only eating a light meal: A heavy meal with lots of fatty food will delay the effect of Viagra because your stomach has to digest the food before it can get around to absorbing the drug.