Maintenance of blood pressure in hypotensive states
Adult: 30-45 mg as a single dose, repeated as necessary or followed by IV infusion of 0.1% mephentermine in 5% dextrose, rate and duration of administration will depend on patient's response.
Intravenous
Hypotension secondary to spinal anaesthesia in obstetric patients
Adult: 15 mg as a single dose, repeat if needed.