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Plasma trough levels (ng/ml) for 17α-hydroxyprogesterone caproate, 17α-hydroxyprogesterone and progesterone from 18 pregnant women following intramuscular administration of 250 mg 17α-hydroxyprogesterone caproate. The patient received at least 5 weekly injections prior to sampling. (◆) 17α-hydroxyprogesterone caproate, (●) 17α-hydroxyprogesterone and (■) progesterone.
