In this case, just leave out the missed dose and take your next dose at the usual time. The usual dose is 50mg, when you need it. Stop taking VIAGRA and call your healthcare provider right away if you have any sudden vision loss sudden hearing decrease or hearing loss. For erectile dysfunction, it’s best to take sildenafil on an empty stomach. In some patients, the use of VIAGRA with alpha-blockers can lead to a drop in blood pressure or to fainting medicines called HIV protease inhibitors, such as ritonavir Norvir , indinavir sulfate Crixivan , saquinavir Fortovase or Invirase , or atazanavir sulfate Reyataz some types of oral antifungal medicines, such as ketoconazole Nizoral and itraconazole Sporanox some types of antibiotics, such as clarithromycin Biaxin , telithromycin Ketek , or erythromycin other medicines that treat high blood pressure other medicines or treatments for ED VIAGRA contains sildenafil, which is the same medicine found in another drug called REVATIO.AdFree 2-day Shipping On Millions of Items. No Membership Fee. Shop Now!1M+ visitors in the past monthServices: Curbside Pickup, Free 2-Day Shipping, Grocery Delivery. Unlike pills like Vigrx Plus which are designed to work over a period of weeks / months, Extenze is a fast acting male enhancement alternative to viagra that works quickly, usually within 45 – 60 min. The original makers of Extenze actually got in a bit of trouble back when they first started selling it. In the journals. Men will soon have a new option for treating erectile dysfunction (ED) that supposedly works faster than regular ED medication — and is available without a .