Cialis (Tadalafil), is a treatment for erectile dysfunction. Cialis relaxes muscles within the penis, and allows increased blood flow into the penis, which helps to achieve and maintain an erection.
Be sure to tell your doctor of any allergies you have whether it is to medication or food, preservatives, or dyes. Also, tell your doctor of any other medications you are taking, including vitamins and supplements, and any medical conditions you may have.
It is very important that you take this medicine exactly as your doctor tells you to. Do not take more medicine than directed. Do NOT double doses.
Contact your doctor immediately if you notice any of the following: an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives); chest pain or irregular heartbeats; dizziness, nausea, or angina (pain, tightness, discomfort, numbness, or tingling in the chest, arms, neck, or jaw); swelling of the ankles or legs; shortness of breath; prolonged or severe dizziness; or a prolonged (lasting longer than 4 hours) or painful erection.
Other, less serious side effects may be more likely to occur. Continue to take Cialis and talk to your doctor if you experience: headache; indigestion; back pain; muscle aches; flushing; stuffy or runny nose; or temporary blue tint in vision or difficulty telling the difference between the colors blue and green.
CIALIS (tadalafil), an oral treatment for erectile dysfunction, is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). Tadalafil has the empirical formula C22H19N3O4 representing a molecular weight of 389.41. The structural formula is: The chemical designation is pyrazino[1´,2´:1,6]pyrido[3,4-b]indole-1,4-dione, 6-(1,3-benzodioxol-5-yl)-2,3,6,7,12,12a-hexahydro-2-methyl-, (6R,12aR)-. It is a crystalline solid that is practically insoluble in water and very slightly soluble in ethanol.
CIALIS is available as film-coated, almond-shaped tablets for oral administration. Each tablet contains 5, 10, or 20 mg of tadalafil and the following inactive ingredients: croscarmellose sodium, hydroxypropyl cellulose, hypromellose, iron oxide, lactose monohydrate, magnesium stearate, microcrystalline cellulose, sodium lauryl sulfate, talc, titanium dioxide, and triacetin.
Cialis has the following structural formula: