Hello and thank you for your question. It’s my first priority and pleasure to help you.
I understand your concern.
As per your description,he should be watched for unusual symptoms like stomach pain, headache, vomiting, anxiety, dizziness, irritability, vision problems, skin rash, numbness or tingling in the hands or feet, and sweating.
In case he develops any symptoms then needs to be evaluated.
Otherwise 54 mg is not overdose and it is not fatal.
Just monitor his blood pressure,pulse.
Maintain a good hydration.
Give him small bland diet 4-6 times a day for few days.
Feel free for further queries. It's good to discuss rather than quit.
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