Payment options: Consider how you’d like to pay. Tadalafil Cialis. That’s not to say there aren’t just as many illegitimate sites. This boosts blood flow and helps you get an erection from sexual activity. Most companies have an FAQ or shipping policy page you can reference to learn whether discreet packaging is available. Refills: See if you can set up automatic refills or order as needed.Levitra is a drug used to treat erectile dysfunction in men. This medication belongs to the class of drugs called phosphodiesterase type 5 inhibitors. You can buy this drug under the common brand name Vardenafil. tadalafil (Cialis) vardenafil (Levitra) avanafil (Stendra) About 30 million men in the United States occasionally have a problem with getting or keeping an erection, according to the Urology. 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.