"Patients with heart, kidney or liver disease should discuss these conditions with their doctors before using Cialis. People with an eye disorder known as retinitis pigmentosa should also be wary of using the drug, the FDA advises.

Most common side effects reported in the clinical trials included headache, indigestion, back pain, muscle aches, runny nose, and abnormal vision."

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Yahoo! News - FDA Approves 3rd Impotence Drug