Tadalafil is available on prescription only. One advantage Cialis has over Viagra and Levitra is its The max dosage of Cialis for erectile dysfunction is 20mg per day when taken as needed or 5mg when taken on a daily basis — but a healthcare professional will almost certainly start you on a lower dose. Healthy erections are all about blood flow. When will Cialis be available to pharmacies?Tadalafil Brand names: Cialis, Adcirca. Tadalafil. Find out how tadalafil treats erectile dysfunction, pulmonary hypertension and benign prostate enlargement, and how to take it. 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. 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.