We considered cost, medications available, and whether generic versions were offered to help reduce costs. Psychological factors like stress, depression, or anxiety can also contribute. This is important for your overall health and safety, as certain medications can negatively interact with each other or cause existing conditions to worsen. Most erectile dysfunction medications belong to the drug class known as PDE5 inhibitors , which help relax the muscles and increase blood flow to allow for a full erection. We also looked at additional services, such as access to digital pharmacies and home delivery options. Popular ED medications found online include: Viagra sildenafil : As the first FDA-approved PDE5 inhibitor for ED, sildenafil is taken 30 minutes to four hours before sexual intercourse to help achieve and maintain an erection.Levitra (vardenafil): This medication is taken one hour before sex and can last up to 24 hours. It’s available in 10 mg and 20 mg tablets. Stendra (avanafil): This is an as-needed . LEVITRA 20MG TABLET 4S; AED (Inclusive of VAT) In stock. Overview. LEVITRA 20MG TABLET 4S. Qty-+ Add to Cart. Wish List. Email. Details. ERECTILE . Levitra will only work when you are sexually stimulated. It reduces the action of the natural chemical in your body which makes erections go away. Levitra allows an erection to last .