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Cialis is used for the treatment of erectile dysfunction (impotence). Its main advantage over other drug treatments for erectile dysfunction is its 36-hour efficacy time.

For most individuals, the recommended starting dose of tadalafil is 10 mg per day taken before sexual activity. Depending on the adequacy of the response or side effects, the dose may be increased to 20 mg or decreased to 5 mg a day. The effect of tadalafil may last up to 36 hours. Individuals who are taking medications that increase the blood levels of tadalafil should not exceed 10 mg in 72 hours (see drug interactions).

Store at room temp. between 15-30°C (59-86°F).

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The most common side effects of Cialis are mild and include facial flushing (reddening), headaches, stomach upset, diarrhea, flu-like symptoms and nausea. Tadalafil also may cause chest pain, low blood pressure, blurred vision and changes in color vision, abnormal ejaculation and priapism (prolonged and painful erection).

The breakdown and elimination of tadalafil from the body may be decreased by erythromycin, ketoconazole (Nizoral), itraconazole (Sporanox), indinavir (Crixivan) and ritonavir (Norvir). Therefore, these drugs may increase the concentration of tadalafil in the blood. If these drugs are being used at the same time as tadalafil, the dose of tadalafil should be reduced in order to avoid side effects from high levels of tadalafil. Tadalafil increases the heart rate and also exaggerates the blood pressure lowering effects of nitrates (e.g., nitroglycerin). In patients who take nitrates for chest pain (angina), tadalafil could cause chest pain by increasing heart rate and lowering blood pressure. Therefore, patients with angina should not use tadalafil. Tadalafil also exaggerates the blood pressure lowering effects of some alpha-blocking drugs e.g., terazosin (Hytrin). Individuals who take these alpha-blockers should not use tadalafil.

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Eli Lilly and Company is a US-based pharmaceuticals corporation employing more than 46,000 individuals worldwise. Eli Lilly develops and markets pharmaceutical products for the treatment of depression, schizophrenia, attention-deficit hyperactivity disorder, diabetes, osteoporosis and many other conditions. The company was founded in 1876 in Indianapolis, Indiana, where it still keeps its corporate center and administrative headquarters.