You have not mentioned the details of the investigations that your father had undergone. Was there any abnormality in the reports? Does your father suffer from any ailment or did he have any complaints when he went for doctor`s consultation.Various medicines that your father is taking are prescribed for following conditions:
D - For acidity and gastritis
Myospaz - A pain killer and muscle relaxant
Exzilor - Antidepressant and antianxiety
Urimax - For prostate
Neurorex - Probably it`s a vit B12 supplement as it`s a brand name and i`m not sure about it`s composition. You may ask your chemist.
You may consult your doctor and discuss with him if your father needs these medicines.