This is Dr. David
does he have a history of prior alcohol use?
slurred speech and stumbling are not good signs
he could have had a stroke which is injury to part of his brain from a blood clot
best to call up 911
get an ambulance there and take him to the ER right away for evaluation.
he needs to see an ER doctor right away for testing, blood test, EKG, brain scan
let me know if you have other questions.
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