Consult your physician about which is right for you. Yes, but only from licensed and regulated pharmacies and with a valid prescription. These include itraconazole Sporanox, Tolsura , ketoconazole Extina, Ketozole, others and ritonavir Norvir. Cialis and Viagra are equally effective. And as the digital age continues to expand, staying informed is the best way to ensure you benefit from the convenience without compromising on safety. ED occurs more frequently in older men.Note: Some pharmacies do not allow the savings card to be used for opioid drugs. How much does tadalafil or cialis cost near you? Find the best tadalafil or cialis prices near you now with our cost comparison tool and start saving today. 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. Generic versions of Cialis that are FDA-approved are equally as effective and safe as brand-name Cialis. Generic versions are often less than half the cost. Last medically reviewed on November