Viagra and similar ED drugs like Cialis (tadalafil) and Levitra (vardenafil) work by relaxing muscles and arteries inside the penis, which helps more blood reach the penis. When aroused—and only when aroused—the combination of relaxation and increased blood flow helps fill the penis with blood. That’s how you’re able to achieve an erection.

After taking Viagra, the medication quickly enters your system and starts working after about an hour, but you can take it anywhere from 30 minutes to 4 hours before sexual activity.

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