Comparative Pharmacology
Head-to-head clinical analysis: ORTHO CEPT versus ORTHO CYCLEN 21.
Peer-Reviewed Evidence
Head-to-head clinical analysis: ORTHO CEPT versus ORTHO CYCLEN 21.
ORTHO-CEPT vs ORTHO CYCLEN-21
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Combination oral contraceptive containing desogestrel and ethinyl estradiol. Inhibits ovulation by suppressing gonadotropin secretion; increases viscosity of cervical mucus, impeding sperm penetration; alters endometrial development.
Combination oral contraceptive containing ethinyl estradiol and norgestimate. Suppresses gonadotropin (FSH, LH) release via negative feedback, inhibiting ovulation. Increases cervical mucus viscosity and alters endometrial structure to impair sperm penetration and implantation.
One tablet (0.15 mg desogestrel / 0.03 mg ethinyl estradiol) orally once daily at the same time each day for 21 days, followed by 7 placebo tablets (or 7 hormone-free days).
One tablet (norgestimate 0.180 mg/ethinyl estradiol 0.035 mg for days 1-7, norgestimate 0.215 mg/ethinyl estradiol 0.035 mg for days 8-14, norgestimate 0.250 mg/ethinyl estradiol 0.035 mg for days 15-21) orally once daily for 21 days, followed by 7 placebo tablets (if included) or 7 drug-free days, then repeat.
None Documented
None Documented
Desogestrel: 23 hours (terminal), Etonogestrel active metabolite: 30 hours (terminal); clinical steady state after 7-10 days
Terminal elimination half-life: Norgestimate metabolite (norelgestromin) ~28 hours; Ethinyl estradiol ~17 hours (range 13-27 hours). Clinical context: Steady-state achieved within 10-14 days.
Renal: 50% (metabolites), Biliary/fecal: 40% (metabolites and unchanged drug), 10% unchanged in urine
Approximately 40% renal (as metabolites), 60% biliary/fecal (as metabolites). Norgestimate metabolites are excreted primarily in urine (40-50%) and feces (50-60%). Ethinyl estradiol metabolites are excreted in urine (40%) and feces (60%).
Category C
Category C
Hormonal Contraceptive
Hormonal Contraceptive