However, in the rare event of an adverse reaction, immediate medical attention is paramount. What Is Cialis? Taking generic ED medications is an effective way to save money without sacrificing quality. Contact your medical provider if you experience any side effects during treatment. Psychological factors like stress, depression, or anxiety can also contribute. However, others work on a cash-pay basis and don’t partner with insurance companies. · The typical dose for once-daily Cialis for ED is milligrams (mg) to 5 mg. When used as needed for ED, the usual Cialis dose is 10 mg (with a maximum daily dose of 20 mg). The typical dose of. Cialis. Cialis 40/20mg, packs of 10 – Pills. The sexual enhancer Cialis is mainly used by men with medically diagnosed erectile dysfunction. This is when the erection is not sufficient for satisfactory sexual intercourse. The drug requires a prescription and is only dispensed in pharmacies against a prescription. Check Price. 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 .