A higher dose of tadalafil is needed if your body does not respond to the recommended dose. Do you know what you need and are ready to purchase? Our Lemonaid doctors or nurse practitioners can advise the right dose for you. Dizziness, fainting spells, heart attack, or stroke may be experienced. Talk to your doctor about which dosing schedule is right for you. An interaction between two medications does not always mean that you must stop taking one of them. Men with poor liver function may need lower doses of Cialis Tadalafil.Cialis Daily. Typical cost per pill. $2/pill with our mail order partner. Prices at Walgreens/CVS can be $18/pill. $ $ $ Lemonaid Mail Order. Yes – FREE delivery. Cialis works by increasing blood flow to the penis to help a person get and maintain an erection. It also blocks the PDE5 enzyme, which enhances the effects of nitric oxide (NO). NO activates a. Tadalafil is in a class of medications called phosphodiesterase (PDE) inhibitors. It works to treat erectile dysfunction by increasing blood flow to the penis during sexual stimulation. This increased blood flow can cause an erection. Tadalafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow more easily.