You should only be treated with one of these products at a time. An erection results from an increase in blood flow to the penis. You can use Cialis on a daily basis at a lower dosage. Common side effects include headache, facial flushing, indigestion, and dizziness. Insurance can help you save even more on consultations and medications. There are two different ways to take tadalafil, either daily or on an as needed basis.Roman sells the following versions of Cialis: Generic: available in tablets of 5, 10, and 20 milligrams (mg), starting from $11 Daily Generic: available in doses of and 5 mg at $8 Branded. Published on October 18, warning This article is no longer being updated and some information may not be current. Visit the GoodRx Healthhomepage for our latest articles. . The recommended starting dose for Cialis intended for once daily use is mg, take at the same time each day, without regard to timing of sexual activity. This may be increased to 5mg/day based on need and tolerability. May be taken with or without food. Cialis is available as a generic, under the name tadalafil. 3.