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How long do erectile dysfunction (ED) medications work?

The amount of time that medications for erectile dysfunction last depends on the particular medication. Viagra and Levitra are typically effective for up to four hours after you take them. Cialis is effective for up to 36 hours.

In order to work, all three drugs require sexual stimulation and arousal; you won't experience an erection unless you are sexually aroused first. 

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.