Will Cialis be prescription or OTC over-the-counter? CIALIS for use as needed was shown to improve erectile function compared to placebo up to 36 hours following dosing. Tadalafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow more easily. Physicians should discuss with patients the appropriate action in the event that they experience anginal chest pain requiring nitroglycerin following intake of CIALIS. It can also interact with many medicines, particularly nitrates used in some types of heart disease and blood pressure medicines.2 days ago · When taken once a day, CIALIS allows you to obtain an erection, when sexually stimulated, at any time point during the 24 hours of the day. Do not take once-a-day dosing and on-demand dosing. Tadalafil is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). It is sometimes known by its generic name tadalafil, and sometimes known by its trade name, Cialis. There are also other brands of this medicine available. MNT ‘s review. Lemonaid sells Cialis in these forms: Cialis: available in doses of 5, 10, and 20 mg, starting at $65 per tablet. Daily Cialis: 5 mg tablet with pricing starting from $50 per tablet.