Medications in this drug class work by affecting an enzyme called phosphodiesterase type 5. Your doctor will probably tell you not to take tadalafil if you are taking nitrates. This is not a complete list of interactions; others may occur with Cialis. Tadalafil is sometimes taken as needed, usually at least 30 minutes before sexual activity and not more often than once every 24 hours. Prolonged erections can be dangerous.Tadalafil (Cialis) Switch to brand medication info_outlined Used for Benign Prostatic Hyperplasia and Erectile Dysfunction MORE expand_more Check your prescription Prescription 5mg tadalafil (Cialis) (30 tablets) edit Choose your pharmacy moses lake, WA Safeway Walgreens Rite Aid info How to use this coupon phone Need help? AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping test1.ru has been visited by 10K+ users in the past month. Dosing is as follows: As needed for ED: 5 to 20 mg by mouth as a one-time dose, with a maximum of one dose in 24 hours. Effects may last up to 36 hours. Daily dosing for ED: or 5 mg by mouth daily. For daily dosing, the maximum dose is 5 mg per day. The medication should be taken once daily at about the same time every day to maintain .