What should I talk to my doctor about when considering if Cialis is right for me? Common side effects include headache, facial flushing, indigestion, and dizziness. It’s also sometimes used to treat pulmonary hypertension high blood pressure in the blood vessels that supply the lungs. This combination can cause dangerously low blood pressure. Combined use could lead to additional lowering of blood pressure, possibly to unsafe levels.Cialis comes in several different strengths, including: milligrams (mg) 5 mg. 10 mg. 20 mg. The cost for these different strengths depends on whether you have insurance, your individual plan. Tadalafil (Cialis) is one of the most popular erectile dysfunction (ED) drugs. Its major appeal? The drug comes in low-dose versions that can be taken daily. This means you can have sex at any time, rather than needing to take a pill from time to time as needed like other ED brands. The starting dose for daily-use Cialis is milligrams (mg). 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.