How long should I wait after drinking to take cold medicine?

I have a cold, but I went out with friends after work. I only drank half of a Crown and water and then half of a beer, which isn't much at all. Then, I got home and realized I might want to take cold medicine before I go to bed. However, I am paranoid to do that after I have drank any amount of alcohol at all. What should I do?
How long should I wait after drinking to take cold medicine?
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