Some men travel frequently for business, are self-employed, or otherwise have unpredictable schedules. This can make things confusing, as in, “Wait, has it been 24 hours since I took Cialis?” Cialis daily, particularly when scheduled with other daily medications, removes some of this confusion and may make things easier for the man who has an unpredictable schedule.
It can also keep levels of the drug high enough that should a man with an unpredictable schedule splurge on a big meal, it should have less of an effect on his ability to have sex compared to if he took the drug on an as-needed basis. In other words, the predictability of dosing can help keep a man ready for sex even if his schedule otherwise is more chaotic.