How Long Does Viagra Last?
Viagra usually remains effective for 4 to 6 hours after taking a dose. Its peak effect occurs within the first 60 to 90 minutes. However, this can vary depending on metabolism, food intake, and age.
While Viagra increases blood flow, it still requires sexual stimulation to work. The drug does not cause continuous or uncontrolled erections.
Disclaimer: Talk to your doctor about how Viagra interacts with your body before use.