Hello and welcome to Healthcare Magic. Thanks for your query.
The symptoms that you have described could be due to the effects of acute intoxication or overdose, or withdrawal or even due to an independent medical / neurological problem. It is very difficult to say this without the knowledge of a detailed history and medical assessment findings.
I would advise you to keep him under close observation and follow-up regularly with his doctor. If there are any danger signs like seizures, altered state of consciousness, irrelevant talk, weakness of any limb, slurred speech, bleeding from the ear or nose, projectile vomiting
, etc. then you have to seek urgent medical help
Wish you all the best.
Dr. Jonas Sundarakumar