First sign of magnesium sulphate toxicity is: (A) Loss of deep tendon reflexes, (B) Cardiac arrest, (C) Respiory depression, (D) Decreased urinary output
Answer is A. Magnesium sulfate toxicity : Loss of deep tendon reflexes. - >7 mEq/L Respiratory depression more than 10 meq/L Cardiac arrest more than 25mEq/L Ref: Dutta Obs 9e pg 222.