Brand names Why is this medication prescribed? Nitrates come as tablets, sublingual under the tongue tablets, sprays, patches, pastes, and ointments. Taking generic ED medications is an effective way to save money without sacrificing quality. Cost-effective: Online platforms often offer competitive prices, discounts, and deals which can lead to significant savings. Your doctor will probably tell you not to take tadalafil if you are taking nitrates. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.Generic Viagra (sildenafil): Starting at $24/month; Generic Cialis (tadalafil): Starting at $39/month; Generic Cialis Daily (tadalafil): Starting at $89/month; Branded . The recommended starting dose for Cialis intended for once daily use is mg, take at the same time each day, without regard to timing of sexual activity. This may be increased to 5mg/day based on need and tolerability. May be taken with or without food. Cialis is available as a generic, under the name tadalafil. 3. 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 prostate) which include difficulty urinating (hesitation, dribbling, weak stream, and incomplete bladder emptying), painful urination, and urinary frequency and urgency in adult men.