Vardenafil usually works for 4 to 5 hours. Medicines that you take by mouth are called oral medicines. Oral ED medicines might not work or might be dangerous if you also take any of the following: Nitrate medicines. But, keep in mind that ED might signal an underlying medical problem, like high blood pressure, heart disease, diabetes, low testosterone, or sleep apnea. Medicines that block an enzyme called CYP3A4. This medicine works best when you take it on an empty stomach an hour before sex. A newer form of the medicine that dissolves on the tongue might work faster than the pill that you swallow.Although erectile dysfunction (ED) may be an upsetting diagnosis for some, many people find their condition is treatable with Viagra — sometimes called the “little blue pill” — and . AdFree & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Discreetly. If appropriate, get a prescription for ED from Rex test1.ru has been visited by 10K+ users in the past monthDiscreet Packaging · Free Shipping · Real DoctorsSexual health: Premature Ejaculation · Erectile Dysfunction · Breakouts. Still, if your doctor says it’s okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price-comparison site .