Take only as directed, usually once daily as needed.
Sildenafil works along with sexual stimulation to help achieve an erection.
Headache, flushing, stomach upset, nasal stuffiness, diarrhea and dizziness might occur. If these effects persist or worsen, notify your doctor promptly. Limit alcohol intake, as it may aggravate side effects of Viagra. To avoid dizziness and lightheadedness when rising from a seated or lying position, get up slowly. The elderly may be more sensitive to the side effects of Viagra, therefore caution is advised in this group.