Viagra is a targeted sildenafil treatment designed to support erectile function within a defined period, allowing men to plan sexual activity with greater predictability while preserving the need for stimulation. As a prescription phosphodiesterase type 5 inhibitor, it reduces the activity of the PDE5 enzyme, supports relaxation of smooth muscle, and improves blood flow to penile tissue when sexual arousal occurs. Viagra is commonly taken about one hour before anticipated activity, although the dosing window may range from 30 minutes to four hours, depending on individual response, food intake, health status, and other medicines. A high-fat meal may delay the onset of action, and the medicine should not be taken more than once per day. Viagra does not increase sexual desire or produce an erection without stimulation. Medical review is required because nitrates, riociguat, cardiovascular conditions, and interacting medicines can make sildenafil use unsafe or require a lower starting dose.
