If a man has been drinking the night before and takes cialis the next morning(after drinking till 1 or 2am) Does he then have a problem still getting an erection because of drinking the night before?

He may have, besides dangers of taking it and drinking. Plus of course it is not always 100 percent effective

Deepens on how hard he tries

Where there is a will, Cialis will find a way. Cialis, like viagra and that class of drugs, allow an erection to occur. You need to be aroused for it to actually occur.

Most of the warnings that come with Cialis and alcohol come from consuming both at the same time. This causes dizziness, fast heart rate, and low blood pressure. Given that you have probably metabolised most, if not all, the alcohol in your system, I would think it would still work.

You shouldn't have a problem. Though I would advise against taking it while drinking for the above stated reasons.