Viagra and alcohol: what are the rules? A phone or video consultation is sometimes required for legal purposes. First and foremost, be sure that whichever online pharmacy you choose is legitimate, safe, and secure. Is Viagra the best tablet for ED? When a man gets aroused, the brain sends signals to the body that tell vessels supplying the penis to open up. At the same time, the brain tells other vessels near the penis to tighten up, to keep blood in this sponge tissue — and this is what makes an erection last.MORE expand_more Check your prescription Prescription mg sildenafil (30 tablets) edit Choose your pharmacy moses lake, WA Safeway Walgreens Rite Aid info How to use . Used for Erectile Dysfunction. Sildenafil (Viagra) is taken by mouth to treat erectile dysfunction (ED). You take it only as needed, typically about an hour before sexual . Online pharmacies allow you to fill prescription medications from the comfort of your home using a pharmacy site or an app rather than having to fill them in person. An online .