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The latter affects 52% of men between the ages of 40 and 70, including mild, moderate and complete forms of ED. An uncommon side effect includes an erection that does not go away and can cause damage to the penis. Additionally, a sudden decrease or loss of vision or hearing may occur although these side effects are very uncommon. A full list of side effects can be found in the information leaflet. Administration of Cialis to patients who are using any form of organic nitrate, is contraindicated.

Compared with other PDE5 inhibitors used in treating erectile dysfunction, tadalafil has the longest duration of action, making it the only once-daily agent of all PDE5 inhibitors. Tadalafil, a carboline derivative with vasodilatory activity, selectively inhibits cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5). PDE5 is important in regulating intracellular concentrations of cGMP by catalyzing its hydrolysis and inactivating cGMP.

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