But even if your erection goes away after you’ve ejaculated, Viagra can help you to get another erection up to 4 hours after you’ve taken a dose. Before starting Viagra, talk with your doctor about any blood pressure problems you have. Viagra’s safety has been shown in several clinical studies. The drug does have a few serious side effects, but these rarely occur.

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These are issues your doctor needs to talk to you about during an office visit before they prescribe the medicine. Erectile dysfunction drugs that are approved by the FDA work by increasing blood flow to the penis. Just like any other medicine, these drugs can have side effects. If you purchase them online -- without a prescription -- you won't get a chance to discuss this with your doctor before you take them. It’s unknown whether this drug is safe to take during pregnancy.
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You may have low blood pressure when you’re taking Viagra. It widens your blood vessels to allow more blood to flow into your penis. Instead, Viagra is approved only to treat erectile dysfunction (ED) in adult males. There is an over-the-counter Viagra – Viagra Connect which is available without a prescription.

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PDE5 inhibitors help blood flow to your penis more easily by widening your blood vessels. This can help to give you strong, long-lasting erections. A 6-month prescription for up to 16 tablets per month will be issued.