Also tell them about any supplements you take. Since , the ED medication Viagra has been available over the counter at many pharmacies, under the brand name Viagra Connect — only in the licensed strength of 50mg. Featured Blog Posts. Everything you would expect from the largest online Canadian Pharmacy! If you have an existing prescription, you can get that transferred over to Felix so that you can start ordering your medications online. Ordering Viagra online from a reputable site provides a safe, discreet, simple way to buy your ED medication.Contraindications Side Effects Warnings Drug Interactions Used For Sildenafil belongs to a group of medications called phosphodiesterase type 5 inhibitors. It is used for the treatment of erectile dysfunction (male impotence). It helps to achieve and keep an erection sufficient for sexual activity. Oral medicines for ED usually work well and cause few side effects. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. Erectile dysfunction refers to the inability of a man to get or maintain an erection firm enough for satisfying sexual activity. ED can have a negative impact on the emotional well-being of men and their partners as it can be tied to self-image and relationship .