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Some side effects, however, are more serious, such as priapism (a prolonged and sometimes painful erection that lasts for more than four hours) or sudden vision or hearing loss. Cialis can cause blood pressure to drop suddenly to an unsafe level if taken with certain other medicines. Do not use Cialis or other ED medications with nitrates (a drug often prescribed for angina and other heart problems) or guanylate cyclase stimulators (a treatment for pulmonary hypertension). Tadalafil is a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). The physiologic mechanism of erection of the penis involves release of nitric oxide (NO) in the corpus cavernosum during sexual stimulation.

It eliminates the necessity to "plan ahead" and allows spontaneous sex from 30 minutes after you have taken the tablet. When taken correctly, Cialis should begin to work within minutes. The effects of one Cialis tablet can last up to 36 hours