Z Vital

Z Vital Virtually each drug created by man has aspect effects and Viagra isn't any exception. Viagra blocks PDE5 however will also affect PDE6 that is used by the cone cells in the retina. This will have an effect on color vision. For some it changes the approach they perceive green and blue colours. For others they see the globe with a bluish tinge for several hours. Because of this pilots cannot take Viagra inside twelve hours of a flight.

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