How long after taking oramorph can you have a alcoholic drink?

Long half life: Oramorph has a long half life. Don't know your dose or why you are taking it. If stable and feeling normal, you can have a drink without getting into trouble. That does not mean you could drink excessively, however.

Give it time: This is a long-acting medicine. Give it at least two days, longer if you can -- the stuff doesn't clear your system for at least those two days.