Cialis As Needed will be prescribed in doses of 5 to 20 mg. All PDE5-inhibitors can be dangerous for men who are on drugs containing nitrates — i. Sorry something went wrong with your subscription Please, try again in a couple of minutes Retry. This type is best if you do not plan to have sex regularly, but want to have the medication on hand. This medicine is also used to treat erectile dysfunction and signs and symptoms of BPH. · When used as needed for ED, the usual Cialis dose is 10 mg (with a maximum daily dose of 20 mg). The typical dose of Viagra for ED is 50 mg. Tadalafil (Cialis) is used to treat erectile dysfunction (ED, impotence; inability to get or keep an erection), and the symptoms of benign prostatic hyperplasia (BPH; an enlarged . Price and dosage: Brand-name Cialis: $20 – $80 per dose (5mg, 10mg, 20mg) Generic Cialis (tadalafil): $11 – $44 per dose (5mg, 10mg, 20mg) Daily generic .