Headache is one of the most common adverse effects of Viagra. This occurs because the drug can cause the brain's blood vessels to dilate.
After consuming Viagra, some individuals may experience facial flushing or redness. This is caused by the dilation of cutaneous blood vessels.
In uncommon instances, Viagra may cause mild and temporary vision changes, such as blurred vision, light sensitivity, or a blue/green tint to the vision.
Taking Viagra may cause some men to experience vertigo or fainting. This can be more prevalent in those who are already susceptible to low blood pressure.
Viagra can induce priapism, which is a painful and prolonged erection lasting more than four hours. Priapism is a rare side effect of Viagra.
Viagra has been linked in exceedingly rare instances to sudden hearing loss. If hearing changes occur after taking Viagra, consult a physician immediately.
Some individuals may experience allergic reactions to Viagra, including rashes, itching, swelling, severe dizziness, and respiratory difficulties.