Looking for Advice (don’t bully me 🤣)

Hi, so long story short I’m a first phase cadet, I’m currently on my Christmas holiday and I’ve had a cold, so I’ve taken medication (standard over the counter cold and flu tablets). I am wondering should I keep the packet and disclose this information if I have a random drug and alcohol test after Christmas. I know this might seem stupid but I just want to know what the standard procedure is 🤣