Comparative Pharmacology
Head-to-head clinical analysis: LEVONORGESTREL versus NORLUTATE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: LEVONORGESTREL versus NORLUTATE.
LEVONORGESTREL vs NORLUTATE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
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.
Progestin that suppresses gonadotropin secretion, inhibits ovulation, and induces endometrial transformation.
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.
5 mg orally once daily for 5 days, starting on day 1 of menstrual cycle; for menorrhagia, 5 mg orally three times daily from day 19 to day 26 of cycle.
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: 24-30 hours (range 11-45 hours). This prolonged half-life supports once-daily or extended-cycle dosing in contraceptive formulations.
Terminal elimination half-life is approximately 5-6 hours. Clinical context: supports twice-daily dosing; steady state reached within 2 days.
Renal: 45-60% (metabolites), Fecal: 32-45% (unchanged and metabolites). Biliary excretion contributes to fecal elimination.
Primarily renal (approximately 60% of metabolites, mostly glucuronides), with about 40% fecal/biliary elimination. Less than 1% excreted unchanged.
Category C
Category C
Progestin
Progestin
"The metabolism of Fluconazole can be decreased when combined with Levonorgestrel."