Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. If you are taking tadalafil on a regular schedule, take it at around the same time every day. Tadalafil treats PAH by relaxing the blood vessels in the lungs to allow blood to flow more easily. Taking Cialis does not mean you are guaranteed to get an erection. Do not take a double dose to make up for a missed one. Cialis is not recommended for people taking any form of nitroglycerin because the combination may lower blood pressure to an unsafe level. What should I talk to my doctor about when considering if Cialis is right for me?Brand names for tadalafil include Cialis. The cost for tadalafil oral tablet 5 mg is around $27 for a supply of 90 tablets, depending on the pharmacy you visit. Quoted prices are for cash-paying customers and are not valid with insurance plans. Cialis (tadalafil) is a member of the impotence agents drug class and is commonly used for Benign Prostatic Hyperplasia, and Erectile Dysfunction. The cost for Cialis oral tablet mg is around $ for a supply of 30 tablets, depending on the pharmacy you visit. Quoted prices are for cash-paying customers and are not valid with insurance. Brand names for tadalafil include Cialis. The cost for tadalafil oral tablet 5 mg is around $27 for a supply of 90 tablets, depending on the pharmacy you visit. Valid at all major chains including Walgreens, CVS Pharmacy, Target, WalMart Pharmacy, Duane Reade and 65, pharmacies nationwide. No manufacturer promotions could be found for.