Comparative Pharmacology
Head-to-head clinical analysis: DROSPIRENONE ETHINYL ESTRADIOL AND LEVOMEFOLATE CALCIUM versus GYNOREST.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DROSPIRENONE ETHINYL ESTRADIOL AND LEVOMEFOLATE CALCIUM versus GYNOREST.
DROSPIRENONE, ETHINYL ESTRADIOL AND LEVOMEFOLATE CALCIUM vs GYNOREST
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.
Gynorest (dydrogesterone) is a synthetic progestogen that binds to the progesterone receptor with high selectivity, inducing conformational changes that promote transcription of progesterone-responsive genes. It has no androgenic, estrogenic, or corticosteroid activity, and does not inhibit ovulation.
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).
100 mg orally twice daily for 5-10 days or 300 mg orally once daily for 6-12 days.
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 16-20 hours; supports twice-daily dosing for maintenance of therapeutic levels.
Drospirenone: ~50% renal (as metabolites), ~40% fecal. Ethinyl estradiol: ~40% renal, ~60% fecal. Levomefolate calcium: ~70% renal (as folate metabolites), ~30% fecal.
Renal: 50-80% as metabolites; Fecal: 20-50% as metabolites; Biliary excretion contributes to fecal elimination.
Category D/X
Category C
Progestin + Estrogen
Progestin