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.
A. What could the patient have been poisoned with?
B. What is the toxic mechanism of this poison?
A. Discuss drug-nutrient interactions in this case.
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?
answer them due to toxicology