Norethisterone contraceptive microspheres.
Two formulations of polylactic and polyglycolic acid microcapsules containing 75 and 100 mg of NET respectively were studied for a 90-day period of anticipated contraceptive effect in two groups of five women. A 200 mg dose of NET preparation was also studied for a 180-day period of anticipated contraceptive effect in 19 women. Alteration in menstrual cycle, with tendency to short bleeding episodes, spotting days, and amenorrhea were the most important collateral effects. In the majority of cases, ovulation was inhibited. No cases of pregnancy were presented. The obtained NET circulating levels were very stable during the period of anticipated contraceptive effect.
Rivera
R
R
Instituto de Investigacion Cientifica, Universidad Juarez del Estado de Durango, Avenida Universidad, Durango, Mexico.
Alvarado
G
G
Flores
C
C
Aldaba
S
S
Hernandez
A
A
D003267:Contraception; D004958:Estradiol / Q000097:blood; D005260:Female; D006801:Humans; D007273:Injections, Intramuscular; D008598:Menstruation / Q000187:drug effects; D008863:Microspheres; D009640:Norethindrone / Q000008:administration & dosage* / Q000009:adverse effects / Q000494:pharmacology; D010053:Ovary / Q000187:drug effects / Q000502:physiology; D011247:Pregnancy; D011374:Progesterone / Q000097:blood
D011374:Progesterone; D004958:Estradiol; D009640:Norethindrone