Thanks for the query to ATD for an opinion,
It is actually not recommended consume alcohol with valium intake. They do interact. Using diazepam( Valium) together with ethanol can increase nervous system side effects such as dizziness, drowsiness, and difficulty concentrating. Some people may also experience impairment in thinking and judgment. You should avoid or limit the use of alcohol while being treated with diazepam. Avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medication affects you.
If you have taken 5mg valium then it shall not produce much of side effects, advise would be to increase your water intake to allow faster metabolism of alcohol from the body. If there exists persistent drowsiness then you may visit ER.
I hope i have answered your query in detail,
Wishing you good health,
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