Although erectile dysfunction (ED) may be an upsetting diagnosis for some, many people find their condition is treatable with Viagra — sometimes called the “little blue pill” — and it’s generic.Remove the cap by pushing it down and twisting it counter-clockwise. To use the oral liquid: Shake the bottle well for at least 10 seconds before each use. This will result in better patient outcomes, increased patient quality of life, and fewer adverse events. Do not use a kitchen teaspoon as it will not measure the right amount. 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.Sildenafil is a medication used in the management and treatment of erectile dysfunction and pulmonary arterial hypertension. It is in the phosphodiesterase-5 inhibitor (PDE5-I) class of medications. This activity describes the indications, actions, adverse effects, and contraindications of sildenafil as an agent in the clinical setting. Knowledge . Sildenafil is used to treat erectile dysfunction (ED) and to reduce blood pressure in pulmonary arterial hypertension (PAH). It is taken when needed for ED and daily for PAH. A headache, stomach upsets, and flushing are the main side effects, and it should not be taken within 24 hours of a nitrate. 5. Tips. Valid at all major chains including Walgreens, CVS Pharmacy, Target, WalMart Pharmacy, Duane Reade and 65, pharmacies nationwide. No manufacturer promotions could be Missing: sell.It continues to work for up to 4 hours, although its action is usually less after 2 hours. An inherited eye disease that affects the retina. The usual adult dose is 20mg taken 3 times a day. Generic versions of sildenafil, vardenafil and tadalafil are available. Vardenafil usually works for 4 to 5 hours. It affects the way the medicine works.