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If this occurs, it’s usually within 1–2 hours after taking it. When PDE5 inhibitors like Viagra are used to treat erectile dysfunction, these medications work by widening the blood vessels, thus, increasing blood flow into the penis. Notably, the effects of Viagra only occur in the presence of sexual stimulation.

If you no longer need to take Viagra and have leftover medication, it’s important to dispose of it safely. This helps prevent others, including children and pets, from taking the drug by accident. The expiration date helps guarantee that the medication remains effective during this time. The current stance of the Food and Drug Administration (FDA) is to avoid using expired medications.

Depending on your age, health status, lifestyle, and other factors, a healthcare provider will help you find a Viagra dosage that’s safe and effective for you. Erectile dysfunction is a common condition, and there are many different physical and psychological factors that can cause it. Common physical causes include obesity, heart disease, and high blood pressure.

And for more information about taking Viagra if you have heart or blood pressure problems, see the "Viagra precautions" section below. If you have a heart problem or low blood pressure, talk with your doctor about whether Viagra is safe for you. Most of these side effects may go away within a few days or a couple of weeks. But if they become more severe or don’t go away, talk with your doctor or pharmacist. It’s important to remember that Viagra only works if you’re already sexually aroused. Arousal may involve having sexual thoughts, looking at sexual images, masturbating, or engaging in foreplay.

A stronger CYP3A4 inhibitor such as ketoconazole or itraconazole could be expected to have greater effect than that seen with saquinavir. The results from this pilot study are shown in Table 3