Avanafil Stendra. However, eating food, particularly high-fat food, can reduce the effectiveness of Viagra. Viagra is always taken as needed, usually about an hour before sex. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. Interestingly, Cialis has been more linked to improved self-esteem and other psychological factors than the other PDE5 medications.Cialis Prices, Coupons and Patient Assistance Programs. Cialis (tadalafil) is a member of the impotence agents drug class and is commonly used for Benign Prostatic Hyperplasia, and Erectile Dysfunction. The cost for Cialis oral tablet mg is around $ for a supply of 30 tablets, depending on the pharmacy you visit. AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping AvailableFree Shipping · Real Doctors · Discreet Packaging · Personalized PlanTypes: Genital Herpes · MEDICATIONS · Testosterone · Sertraline. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil (Viagra). Tadalafil (Cialis). Vardenafil. These medicines are called PDE5 inhibitors. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide.