The table below summarizes the typical dosages for tadalafil: Indications of Tadalafil:. Alternatively, Cialis may be prescribed as an as-needed treatment for ED, to be taken before sexual activity. Online ED consultations offer privacy, convenience, and affordability while allowing you to quickly get the medications you need—the same day, with some services. Erectile dysfunction medications require a prescription from a licensed provider. These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Most companies have an FAQ or shipping policy page you can reference to learn whether discreet packaging is available.How Cialis Works. Tadalafil and other PDE5 inhibitors primarily work by inducing muscle relaxation. Tadalafil stops the breakdown of a chemical responsible for relaxing muscles. In ED and PAH, the drug targets muscle cells in blood vessels. When the blood vessel muscle cells relax, this expands the vessel and increases blood flow; this . $ (save %) local_offer_outlined Avg retail price $ medication_outlined Availability Available See GoodRx coupons warning Are you looking for information on Adcirca (tadalafil) instead? What is Tadalafil (Cialis)? Drug Facts Common Brands Cialis Drug Class PDE-5 inhibitor. Quoted prices are for cash-paying customers and are not valid with insurance plans. This price guide is based on using the discount card which is accepted at most U.S. pharmacies. A generic version of Cialis is available. .