Comparative Pharmacology
Head-to-head clinical analysis: DEMULEN 1 50 21 versus LO SIMPESSE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: DEMULEN 1 50 21 versus LO SIMPESSE.
DEMULEN 1/50-21 vs LO SIMPESSE
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
DEMULEN 1/50-21 is a combined oral contraceptive containing ethinyl estradiol and ethynodiol diacetate. Ethinyl estradiol and progestins inhibit gonadotropin release (FSH and LH) from the pituitary, suppressing ovulation. Progestins also increase cervical mucus viscosity and alter endometrial receptivity, impeding sperm penetration and implantation.
Bile acid sequestrant; binds bile acids in the intestine, forming an insoluble complex that is excreted in feces, thereby reducing enterohepatic circulation of bile acids and promoting conversion of cholesterol to bile acids in the liver, leading to decreased serum LDL cholesterol.
1 tablet (ethinyl estradiol 50 mcg, norethindrone 1 mg) orally once daily for 21 days, followed by 7 days off.
100 mg orally once daily, with or without food.
None Documented
None Documented
Ethinylestradiol: 13 ± 3 h (biphasic; terminal phase used for dosing interval). Clinical context: steady-state achieved after ~3 days; missed dose may reduce contraceptive efficacy if >36 h.
Terminal elimination half-life is 12-16 hours in adults with normal renal function; may extend to >40 hours in severe renal impairment (CrCl <30 mL/min).
Renal (approx. 50% as metabolites, <1% unchanged), fecal (approx. 40%, largely as ethinylestradiol conjugates), biliary (minor, enterohepatic recirculation of ethinylestradiol)
Primarily renal, with 70-80% of the dose excreted unchanged in urine; 10-20% via feces through biliary elimination.
Category C
Category C
Combination Oral Contraceptive
Combination Oral Contraceptive