<prompt> Which of the following drug is to be discontinued on the day of surgery -AtenololAmlodipineMetforminStatin  <response>: Ans. is C i.e., Metformin o Metformin needs to be stopped at least 48 hours before surgery for the fear of lactic acidosis. o Other drugs that need to be discontinued before surgery. o OCP --- 4 weeks before surgery o Irreversible MAO inhibitor --- 2 weeks before surgery. o Reversible MAO inhibitor -- A day before surgery. o Lithium --- 2 days before surgery. 