Before taking tadalafil, tell your doctor and pharmacist if you are allergic to tadalafil, any other medications, or any of the ingredients in tadalafil tablets. However, others work on a cash-pay basis and don’t partner with insurance companies. Ask your doctor if you are not sure whether any of your medications contain nitrates. Your doctor may need to change the doses of your medications or monitor you carefully for side effects. We considered cost, medications available, and whether generic versions were offered to help reduce costs. If you have an erection that lasts for more than 4 hours, you should go to the nearest hospital emergency department.Tadalafil is a medicine used to treat erectile dysfunction (ED, also called impotence) and problems with urination caused by an enlarged prostate (benign prostatic hypertrophy or BPH). It is sometimes known by its generic name tadalafil, and sometimes known by its trade name, Cialis. There are also other brands of this medicine available. AdFree & Private Online Consultant with Real Doctors. Reliable E.D. Meds Shipped Discreetly. Save Time & Money with Online Prescription for Viagra, Cialis, Sildenafil and Tadalafil. 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.