The plasma concentration of a synthetic progestin, R 2323, released from polysilastic vaginal rings.
D003274:Contraceptive Devices, Female; D003692:Delayed-Action Preparations; D005260:Female; D006801:Humans; D009645:Norgestrienone / Q000031:analogs & derivatives / Q000097:blood*; D009651:Norpregnatrienes / Q000097:blood*; D045167:Progesterone Congeners / Q000494:pharmacology; D011863:Radioimmunoassay / Q000379:methods; D013997:Time Factors; D014621:Vagina / Q000187:drug effects
D003692:Delayed-Action Preparations; D009651:Norpregnatrienes; D045167:Progesterone Congeners; D009645:Norgestrienone