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Sildenafil citrate, sold under the names Viagra, Revatio and generically under various other names, is a drug used to treat male erectile dysfunction (impotence).It was developed by the biotechnology firm ICOS and marketed worldwide by Eli Lilly and Company under the brand name Cialis.In the United States, tadalafil has Food and Drug Administration approval and became available in December, 2003 as the third impotence pill after sildenafil (Viagra) and vardenafil (Levitra).Due to its 36-hour effect it is also known as the weekend pill. It works by inhibiting an enzyme known as PDE5.A 20 mg dose of Tadalafil is comparable to a 100 mg dose of sildenafil (Viagra).The empirical formula for tadalafil is C22H19N3O4, and its official organic name is (6R,12aR)-6-(1,3-benzodioxol-5-yl)-2,3,6,7,12,12a- hexahydro-2-methyl-pyrazino[1 ,2 :1,6]pyrido[3,4-b]indole-1,4-dione. The molecular weight is 389.41.The tablets are yellow, film-coated, and almond-shaped, and are produced in 5, 10, or 20mg doses.The most common side effects when using tadalafil are headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose.These side effects usually go away after a few hours.Back pain and muscle aches can occur 12 to 24 hours after taking the drug, and the symptom usually disappears after 48 hours.Since PDE5 inhibitors such as tadalafil may cause transiently low blood pressure (hypotension), organic nitrates should not be taken for at least 48 hours after taking the last dose
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Sildenafil citrate, sold under the names Viagra, Revatio and generically under various other names, is a drug used to treat male erectile dysfunction (impotence).It was developed by the biotechnology firm ICOS and marketed worldwide by Eli Lilly and Company under the brand name Cialis.In the United States, tadalafil has Food and Drug Administration approval and became available in December, 2003 as the third impotence pill after sildenafil (Viagra) and vardenafil (Levitra).Due to its 36-hour effect it is also known as the weekend pill. It works by inhibiting an enzyme known as PDE5.A 20 mg dose of Tadalafil is comparable to a 100 mg dose of sildenafil (Viagra).The empirical formula for tadalafil is C22H19N3O4, and its official organic name is (6R,12aR)-6-(1,3-benzodioxol-5-yl)-2,3,6,7,12,12a- hexahydro-2-methyl-pyrazino[1 ,2 :1,6]pyrido[3,4-b]indole-1,4-dione. The molecular weight is 389.41.The tablets are yellow, film-coated, and almond-shaped, and are produced in 5, 10, or 20mg doses.The most common side effects when using tadalafil are headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose.These side effects usually go away after a few hours.Back pain and muscle aches can occur 12 to 24 hours after taking the drug, and the symptom usually disappears after 48 hours.Since PDE5 inhibitors such as tadalafil may cause transiently low blood pressure (hypotension), organic nitrates should not be taken for at least 48 hours after taking the last dose of tadalafil.Using organic nitrates (such as the sex drug Amyl nitrite) within this timeframe may increase the risk of life-threatening hypotension.Since people who have taken tadalafil within the past 48 hours cannot take organic nitrates to relieve angina (GTN Spray), these patients should seek immediate medical attention if they experience anginal chest pain [1].In the event of a medical emergency, paramedics and medical personnel should be notified of any recent doses of tadalafil.The history of Cialis cannot be discussed without mentioning Pfizer's drug, Viagra.The FDA's approval on March 27, 1998, led this prescription