A 33-year-old academic staff member suddenly started shouting and talking to his dead grandfather while giving a lecture

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A 33-year-old academic staff member suddenly started shouting and talking to his dead grandfather while giving a lecture. While he was being taken to the hospital, he began to breathe forcefully, then had a seizure and fell into a coma.
ECG results show bradycardia. lab results; blood pressure 100/60 mmHg, glucose 100 mg/dl (normal), Na+ 124 mmol/L, K+ 4.2 mmol/L, Cl- 99 mmol/L, ALP 149 U/L, AST 93 U/L
, ALT 19 U /L, LDH 846 U/L, total protein 5.9 g/dl, albumin 3.2 g/dl, urea 45 mg/dl,
creatinine 0.7 mg/dl, Ca+2 9.3 mg/dl.
According to the disease-file, our patient had depression and social phobia. Records show that he filled the medicine 2 days before this event. The patient recovered and was discharged within 2 days.
D. What are the precautions to be taken in the first aid and treatment of poisoning in this case?
E. Is there an antidote for this drug/poison? What is it, if any? What is the antidote mechanism of action?