The dose of betamethasone for fetal lung maturation is

A single course of coicosteroids is currently recommended for women between 24 to 34 weeks who are at risk for delivery within 7days. Betamethasone and dexamethasone appear to be equivalent for fetal lung maturation. Dose: 12mg doses of betamethasone, each dose is given intramuscularly 24hours apa. With dexamethasone, 6mg doses are given intramuscularly every 12hours for four doses. (Ref: William's Obstetrics; 25th edition)