Severe premenstrual exacerbations of asthma: effect of intramuscular progesterone.

Three patients with severe premenstrual exacerbations of asthma are reported. None had responded to conventional treatment, including high-dose corticosteroids. In all cases there was a striking fall premenstrually in peak flow rate. The addition of intramuscular progesterone (100 mg daily in two cases and 600 mg twice a week in one) to the regimen eliminated the premenstrual dips in peak flow, and daily doses of prednisolone were reduced in the three patients.