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In: Mishell, D.R., Jr., and Martinez-Manautou, J., eds. Clinical experience with the progesterone uterine therapeutic system. (Proceedings of the Acapulco Workshop, Acapulco, Mexico, October 15-16, 1976) Princeton, New Jersey, Excerpta Medica, 1978. p. 99-103In order to compare the efficacy and acceptability of the Progestasert progesterone-releasing IUD and the Gravigard Copper-7 device, 295 parous women randomly received the progesterone device (146) or the copper device (149). Follow-up examinations took place at 1, 3, 6, and 12 months postinsertion. It was found that event rates did not differ significantly between the progesterone (1569 women-months) and the copper (1558 woman-months) devices. Greater pain on insertion (23.3% versus 15.4%), less metrorrhagia (7.5% versus 13.4%), and higher continuation rates after 1 year of use (87.2% versus 84.6%) were associated with the progesterone device. A flow decrease of 27.2% and increase of more than 22.3% was associated with the Copper-7. Duration of menstruation was not significantly different between the 2 groups, but the progesterone IUD users had more days of "spotting." In both groups, duration of menstruation increased by the end of the study year for a large number of women. This was significant only in Copper-7 users.