Heres an article on the subject
Here's the most relevant part for what you're asking:
Quote:
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A similar effect occurs with medications that contains codeine. The pain killer is considered an opiode-based drug which also depresses the central nervous system. Taking codeine and a 12 oz. glass of beer will double feelings of sedation and slow reaction time.
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In other words, you'll be fine - just don't plan on going anywhere or being too coordinated for the rest of the evening. You'll definitely feel out of it.