· Tadalafil is used to treat men who have erectile dysfunction (also called sexual impotence). Tadalafil belongs to a group of medicines called phosphodiesterase .From Mayo Clinic to your inbox Sign up for free and stay up to date on research advancements, health tips, current health topics, and expertise on managing health. Talk with the doctor. Cialis was also investigated in combination with finasteride, another BPH medication, in another trial. Urapidil Voriconazole Using this medicine with any of the following medicines may cause an increased risk of certain side effects, but using both drugs may be the best treatment for you. This medicine comes with a patient information leaflet.Cialis (tadalafil) is a moderately priced drug used to treat erection problems in men. It may also be used to treat the enlargement of the prostate gland. This drug is slightly more popular than comparable drugs. It is available in both brand and generic versions. Tadalafil is thought to work by relaxing the smooth muscle in the prostate and drug does not protect against sexually transmitted diseases (such as HIV, hepatitis B, gonorrhea, syphilis). Dose may be adjusted based on tolerability (dosing range: 5 to 20 mg). Note: Erectile function may be improved for up to 36 hours following a single dose. Once-daily dosing: mg once daily at approximately the same time daily without regard to .Ethanol Other Medical Problems The presence of other medical problems may affect the use of this medicine. To provide you with the most relevant and helpful information, and understand which information is beneficial, we may combine your email and site usage information with other information we have about you. Your healthcare provider will discuss which dose is right for you. May increase risk of unwanted side effects eg, prolonged erection of the penis. That means seven out of 10 people who take these drugs as prescribed will have more frequent or longer-lasting erections. Viagra Choosing the right ED pill can be intimidating. Both Cialis and Viagra are effective at these doses.