If a doctor or label says don't take a medication with alcohol what does that mean to you?

Does it mean to you don’t swallow the pills with alcohol? Or, don’t drink any alcohol while taking that medication?

What about don’t take with dairy products?

Don’t take with food?

Don’t go in the sun?

Drink with a full glass of water?

What would you do with each of these recommendations?

Would you be concerned about the efficacy of the drug if you don’t comply? Or, that it can be dangerous?