Comparative Pharmacology
Head-to-head clinical analysis: ORTHO CYCLEN 28 versus ORTHO NOVUM 10 11 21.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ORTHO CYCLEN 28 versus ORTHO NOVUM 10 11 21.
ORTHO CYCLEN-28 vs ORTHO-NOVUM 10/11-21
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Combination oral contraceptive containing ethinyl estradiol and norgestimate. The primary mechanism is inhibition of gonadotropin secretion (FSH and LH) via negative feedback on the hypothalamic-pituitary axis, thereby suppressing ovulation. Additional effects include thickening of cervical mucus (impedes sperm penetration) and alterations in the endometrium (reduces implantation likelihood).
Combination oral contraceptive consisting of norethindrone (progestin) and ethinyl estradiol (estrogen). Prevents ovulation primarily by suppressing gonadotropin release, including FSH and LH. Also increases cervical mucus viscosity, impeding sperm penetration, and alters endometrial structure, reducing implantation likelihood.
One tablet (0.18 mg norgestimate/0.035 mg ethinyl estradiol) orally once daily for 28 days, first tablet on day 1 of menstrual cycle with 7 placebo tablets in last 7 days.
One tablet (10 mg norethindrone/0.035 mg ethinyl estradiol) orally once daily for 21 days, followed by 7 placebo days. Start on first Sunday after menstrual period begins or on day 1 of cycle.
None Documented
None Documented
Ethinyl estradiol: 13-27 hours; Norelgestromin (active metabolite of norgestimate): 28-52 hours. Terminal half-lives support once-daily dosing.
Norethindrone: 7-8 hours (terminal); Ethinyl estradiol: 10-20 hours (terminal). Clinically, steady state reached within 5-7 days.
Renal (60-70% as metabolites, ~20% unchanged), Fecal (30-40% as metabolites); primarily conjugated metabolites of ethinyl estradiol and norgestimate.
Renal: ~50% (metabolites as glucuronide and sulfate conjugates); Fecal: ~30% (via bile); Urinary unchanged: <1%.
Category C
Category C
Hormonal Contraceptive
Hormonal Contraceptive