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It works by inhibiting an enzyme known as PDE5. A 20 mg dose of Cialis is comparable to a 100 mg dose of sildenafil (Viagra).
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Since PDE5 inhibitors such as Cialis may cause transiently low blood pressure (hypotension), organic nitrates should not be taken for at least 48 hours after taking the last dose of Cialis.

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The most common side effects when using Cialis are headache, indigestion, back pain, muscle aches, flushing, and stuffy or runny nose. These side effects usually go away after a few hours. Patients who get back pain and muscle aches usually get it 12 to 24 hours after taking the drug, and the symptom usually goes away after 48 hours.
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The empirical formula for Cialis 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.
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Cialis is a drug used to treat male erectile dysfunction (impotence).
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In the United States, Cialis has Food and Drug Administration approval and became available in December, 2003 as the third pill after Viagra and Levitra. Due to its 36-hour effect it is also known as the "Weekend Pill".
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It was developed by the biotechnology firm ICOS and marketed worldwide by Eli Lilly and Company under the brand name Cialis.
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