Follow your doctor’s directions carefully, and ask your doctor or pharmacist to explain any part you do not understand. What should I talk to my doctor about when considering if Cialis is right for me? Comparison with actions of other PDE5 inhibitors[ edit ] Sildenafil and vardenafil inhibit PDE6, an enzyme found in the eye, more than tadalafil. How should this medicine be used? If you need emergency medical care for a heart problem, it will be important for your health care provider to know when you last took Cialis. Tadalafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow more easily.. Dosage. mg. 5mg. 10mg. 20mg. No data.. Quantity. 5. 6. No data.. Read More About This Drug. headache. indigestion. back pain. muscle pain. flushing. stuffy nose. Patients who get back pain and muscle aches usually get them 12 to 24 hours after taking Cialis and these usually go away by. 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.