Both start from about half an hour after you take them, which means no long delays before you get down to business. Tadalafil and Cialis have identical results in clinical trials for their effectiveness. The effects of Sildenafil and Tadalafil are not identical in every person that takes them. This is particularly true if you have any heart conditions or health problems. Cialis vs. This is why brand and generic medications often look different from one another.It is the brand name for tadalafil, a medication also used to treat ED. Tadalafil is in a class of drugs called phosphodiesterase-5 (PDE5) inhibitors and is . Manufacturer: LILLY Approval date: January 7, Strength (s): MG [ RLD] [ AB1] Has a generic version of Cialis been approved? Yes. The following products .