Progesterone release rate in progestase is:-

Progestase: T-shaped device carrying 38 mg of progesterone in silicon oil reservoir in the veical stem. Releases 65 mcg of the hormone per day. Hormone released in the uterus forms a thick plug of mucus at the cervical os which prevents penetration by the sperms and thus exes an added contraceptive effect. Menstrual problems like menorrhagia and dysmenorrhoea noticed with Copper T are less with this device (40% reduction) Expensive and requires yearly replacement.