Why does it indicate on the cialis box don't split tablet take entire dose? will it not work if i split the 20mg dose in to 2, 10mg?

Cialis can be split.: Tadalafil pills (cialis) can be split & taken without altering its performance. Lilly, the maker of cialis, warns against splitting because the pills are not scored. This could result in an uneven split, and therefore differences in drug dose. Some drugs cannot be split because they have a special coating that regulates drug release: this is not the case with cialis.