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Vidalista Black 80 mg blocks the PDE5 enzyme, allowing levels of cyclic guanosine monophosphate (cGMP) to remain elevated. This relaxes the smooth muscles in the blood vessels of the penis, increasing blood flow and making it easier to achieve and maintain an erection. Sexual stimulation is still required for the medication to be effective. The medicine typically begins working within 30 to 60 minutes after it is taken. One of tadalafil's distinguishing features is its long duration of action, with effects that may last for up to 36 hours, although this does not mean a continuous erection.