Comparative Pharmacology
Head-to-head clinical analysis: DROSPIRENONE ETHINYL ESTRADIOL AND LEVOMEFOLATE CALCIUM versus NORETHINDRONE ACETATE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DROSPIRENONE ETHINYL ESTRADIOL AND LEVOMEFOLATE CALCIUM versus NORETHINDRONE ACETATE.
DROSPIRENONE, ETHINYL ESTRADIOL AND LEVOMEFOLATE CALCIUM vs NORETHINDRONE ACETATE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Combination of drospirenone (a progestin with antimineralocorticoid and antiandrogenic activity), ethinyl estradiol (an estrogen), and levomefolate calcium (a folate supplement). Prevents ovulation by suppressing gonadotropins; increases cervical mucus viscosity, inhibiting sperm penetration; levomefolate provides folate to reduce neural tube defect risk.
Progestin that suppresses gonadotropin secretion, inhibits ovulation, and induces endometrial thinning. Also binds to progesterone receptors, exerting antiestrogenic effects.
One tablet orally once daily for 28 days (21 active tablets containing drospirenone 3 mg, ethinyl estradiol 0.02 mg, and levomefolate calcium 0.451 mg, followed by 7 placebo tablets containing levomefolate calcium 0.451 mg).
Oral, 5 mg once daily for 14 days per cycle, beginning on day 1 of menstrual cycle; for endometriosis, 5 mg daily for 14 days then 10 mg daily for 14 days, then 15 mg daily, or as tolerated up to 15 mg daily continuous.
None Documented
None Documented
Drospirenone: ~30 hours (steady state achieved after 8 days). Ethinyl estradiol: ~13-17 hours (biphasic, terminal). Levomefolate calcium: ~4-6 hours (folate derivatives have longer retention).
Terminal elimination half-life is approximately 5-8 hours (mean 7.5 hours). Clinically, steady-state is achieved within 2-3 days of daily dosing.
Drospirenone: ~50% renal (as metabolites), ~40% fecal. Ethinyl estradiol: ~40% renal, ~60% fecal. Levomefolate calcium: ~70% renal (as folate metabolites), ~30% fecal.
Renal (39-61% as metabolites), biliary/fecal (35-49% as metabolites). Less than 1% excreted unchanged.
Category D/X
Category D/X
Progestin + Estrogen
Progestin