Patients not conforming the: Positive patella reflex.
Diuresis more than 100 mL/4 hours.
No sign of respiratory depression.
Respiration more than 16 times/minute.
Magnesium is contraindicated in patients with heart block, since Magnesium may exacerbate this condition.
Patients with renal failure (creatinine clearance < 20 mL/minute), since there is an increased risk of hypermagnesemia in these patients.
Magnesium Sulfate should not be administered to pregnant women in the two hours prior to delivery, unless it is the only therapy available to pregnant aclamtic seizures.