How long does Viagra take to work, and how long does it last once it’s in your body? For the most part, brand-name Viagra and generic sildenafil start to work quickly and last a few hours.

Viagra costs $90 to $139 per tablet. Generic sildenafil can range from $2 to $10 per pill, depending on the manufacturer and dose.

Viagra inhibits PDE5 and acts as a vasodilator (something that dilates blood vessels and increases blood flow). A single tablet of sildenafil can do that — typically, one dose is all that’s ...

Erectile dysfunction meds, like Viagra and Cialis, can help you get and keep an erection. However, each has different side effects, dosage schedules, and other factors. Here, we look at how they ...