Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours. These medicines all work well for ED. Vardenafil usually works for 4 to 5 hours. Tadalafil Cialis.Optum Store Sildenafil If you are experiencing the symptoms of erectile dysfunction (ED), you may have considered using Viagra or a similar ED medication as a possible . Learn More IF YOU CHOOSE BRAND-NAME VIAGRA, MAKE SURE YOU GET THE BRAND NAME Your prescription may have been filled with a generic version instead of . sildenafil citrate or viagra Savings, Coupons and Information. | SILDENAFIL (sil DEN a fil) treats erectile dysfunction (ED). It works by increasing blood flow to the penis, which .