You have initiated 'Magpie' regime for a patient with eclampsia. Later you notice that the respiratory rate is 6/minute and the tendon reflexes are not elicitable. What is the next appropriate step?

This is a case of MgSO4 toxicity and so the antidote is IV Calcium gluconate. Respiratory rate <14/minute or absent tendon reflex or urine output of Ref: Oxford Handbook of Clinical Specialities, Edition 8, Page - 49