These effects on the metabolite are not expected to be of clinical consequence. Children 1 year of age and older weighing 20 to 45 kg—20 mg 3 times a day. John’s wort. If you prefer, you may contact the U. Take sildenafil exactly as directed. The mean steady state volume of distribution Vss for sildenafil is L, indicating distribution into the tissues.According to price-comparison site test1.ru, generic Revatio will cost you as little as $ per pill, depending on where you fill your prescription. That’s compared with more than $50 per. AdGet a Prescription for ED treatment, discreetly deliverED to your test1.ruive Offers · How It Works · Get More Info4/5 ( reviews)Types: Finasteride · Tadalafil · Sildenafil.  · The effects may be increased because of slower removal of the medicine from the body. Leukemia (blood related cancer) or. Multiple myeloma (blood related cancer) or. Sickle-cell anemia (blood disorder)—Sildenafil should be used with caution in these patients as problems with prolonged erection of the penis may occur.