Take tadalafil exactly as directed. If you are taking tadalafil for erectile dysfunction on a regular schedule, take the missed dose as soon as you remember it. Resources and support See the Healthy Male site for more information about erectile dysfunction and its treatment. Sexual activity may be a strain on your heart, especially if you have heart disease. Some examples of nitrates are nitroglycerin Nitro-Dur, Nitrostat, others , isosorbide mononitrate Monoket and isosorbide dinitrate Bidil. Society and culture[ edit ] Marketing[ edit ] Cialis 5mg UK pack of 28 tablets In the United States, the FDA relaxed rules on prescription drug marketing in , allowing advertisements targeted directly to consumers. This medication is taken with or without food an hour before sex.Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash. Cialis Cialis – Uses, Side Effects, and More Generic Name (S): tadalafil Uses Tadalafil is used to treat male sexual function problems (impotence or erectile dysfunction-ED). · But on average, its effects start to lessen 2 to 3 hours after you take a dose. The typical dose for once-daily Cialis for ED is milligrams (mg) to 5 mg. When used as needed for ED, the usual.