Comparative Pharmacology
Head-to-head clinical analysis: AYGESTIN versus LEVONORGESTREL.
Peer-Reviewed Evidence
Head-to-head clinical analysis: AYGESTIN versus LEVONORGESTREL.
AYGESTIN vs LEVONORGESTREL
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Progestin that suppresses gonadotropin secretion, inhibits ovulation, and induces endometrial changes by binding to progesterone receptors.
Synthetic progestin that suppresses gonadotropin release (GnRH, LH, FSH) via negative feedback on the hypothalamic-pituitary-ovarian axis; inhibits ovulation, thickens cervical mucus, and alters endometrial lining.
5 mg orally once daily for secondary amenorrhea; 5 mg orally once daily from day 5 to day 25 of menstrual cycle for abnormal uterine bleeding.
For emergency contraception: 1.5 mg orally as a single dose or 0.75 mg orally 12 hours apart. For hormonal contraception: 0.03 mg to 0.05 mg orally once daily in combined oral contraceptives; for progestin-only oral contraceptive (mini-pill): 0.03 mg orally once daily. For intrauterine system (IUD): 52 mg intrauterine device inserted for up to 5 years.
None Documented
None Documented
Clinical Note
moderateLevonorgestrel + Sulfisoxazole
"The metabolism of Sulfisoxazole can be decreased when combined with Levonorgestrel."
Clinical Note
moderateLevonorgestrel + Erythromycin
"The metabolism of Erythromycin can be decreased when combined with Levonorgestrel."
Clinical Note
moderateLevonorgestrel + Cyclosporine
"The metabolism of Cyclosporine can be decreased when combined with Levonorgestrel."
Clinical Note
moderateLevonorgestrel + Fluconazole
Terminal half-life 5-12 hours; clinical context: requires twice-daily dosing for consistent serum levels.
Terminal half-life: 24-30 hours (range 11-45 hours). This prolonged half-life supports once-daily or extended-cycle dosing in contraceptive formulations.
Approximately 50-80% renal as metabolites, 10-20% fecal; less than 1% unchanged.
Renal: 45-60% (metabolites), Fecal: 32-45% (unchanged and metabolites). Biliary excretion contributes to fecal elimination.
Category C
Category C
Progestin
Progestin
"The metabolism of Fluconazole can be decreased when combined with Levonorgestrel."