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. Sexually transmitted infections: Viagra Sildenafil does not protect against sexually transmitted infections such as HIV. Blood pressure may suddenly drop to life-threatening levels if Viagra Sildenafil is taken with any nitrate-containing medication e. Some medications should not be taken with sildenafil. Sildenafil Viagra is used to treat erectile dysfunction impotence; inability to get or keep an erection in men.Checking the legitimacy of your online pharmacy. Two ways you can check if your online pharmacy is legitimate: For sites listing a Canadian street address, check with the pharmacy regulatory authority for that province or territory to see if the pharmacy is licensed. For example, if the site provides a Quebec address as its pharmacy. Getting a 3-month supply. You may be able to get a day supply of Viagra. If approved by your insurance company, getting a day supply of the drug could reduce your number of trips to the. AdSave Time & Money with Online Prescription for Viagra, Cialis, Sildenafil and Tadafil. Free & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped test1.ru has been visited by 10K+ users in the past monthTypes: Sertraline · MEDICATIONS · Testosterone · Erectile Dysfunction.