Head-to-head clinical analysis & difference comparison: details on mechanism of action, dosing, half-life, interactions, and maternal-fetal safety.
DUAVEE vs CLOMID
Clinician-reviewed, head-to-head comparison of mechanism, dosing, pharmacokinetics, and safety profiles.
Last clinically reviewed: July 2026 · OpiCalc Medical Review Team
DUAVEE is a combination of conjugated estrogens (CE) and bazedoxifene (BZA). CE activates estrogen receptors (ERα and ERβ) to relieve menopausal symptoms; BZA is a selective estrogen receptor modulator (SERM) that antagonizes ER in the endometrium to prevent endometrial hyperplasia.
Competitive antagonist of estrogen receptors (ER) in hypothalamus and pituitary, leading to increased gonadotropin-releasing hormone (Gn RH) and subsequent LH and FSH release, stimulating ovulation.
Moderate to severe vasomotor symptoms due to menopause,Prevention of postmenopausal osteoporosis
Treatment of ovulatory dysfunction in women desiring pregnancy (FDA approved),Off-label: treatment of male infertility (oligospermia)
One tablet (conjugated estrogens 0.45 mg/bazedoxifene 20 mg) orally once daily.
50 mg orally once daily for 5 days, starting on day 5 of the menstrual cycle. May increase to 100 mg daily if no response.
Conjugated estrogens: terminal half-life of estrone sulfate is approximately 10-24 hours. Bazedoxifene: terminal half-life is approximately 30 hours. Clinically, steady state is achieved within 7 days for estrogens and 10-14 days for bazedoxifene.
Terminal half-life is 5–7 days for zuclomiphene (active isomer), with prolonged elimination due to enterohepatic recirculation.
Conjugated estrogens are primarily metabolized in the liver via phase II conjugation (sulfation and glucuronidation) by enzymes such as UGT1A1, UGT1A8, UGT1A9, UGT2B7, and SULT1A1. Bazedoxifene undergoes hepatic metabolism via glucuronidation by UGT1A1, UGT1A8, UGT1A9, and UGT2B7, with minimal CYP involvement.
Hepatic via CYP3A4 and CYP2D6; undergoes enterohepatic circulation; terminal half-life ~5-7 days
Conjugated estrogens are primarily excreted in urine as glucuronide and sulfate conjugates, with approximately 10-15% excreted in feces via biliary elimination. Bazedoxifene is mainly eliminated in feces (85%) with minimal renal excretion (<1% as unchanged drug).
Primarily hepatic metabolism; metabolites excreted in feces (42%) and urine (8% unchanged).
Conjugated estrogens: extensive binding to albumin (approximately 80-85%). Bazedoxifene: highly bound (>99%) to albumin and alpha-1-acid glycoprotein.
Highly protein bound (>99%), primarily to albumin.
Conjugated estrogens: Vd approximately 0.5-2 L/kg, indicating distribution into total body water and tissues. Bazedoxifene: Vd approximately 1.2 L/kg, suggesting extensive tissue distribution.
Not well-characterized; limited data suggest a large Vd (>100 L) due to extensive tissue distribution.
Conjugated estrogens: oral bioavailability is approximately 30-50% due to first-pass metabolism. Bazedoxifene: absolute oral bioavailability is approximately 6% due to extensive first-pass glucuronidation.
Oral bioavailability is approximately 50% due to first-pass metabolism.
No dosage adjustment required for mild to moderate renal impairment (Cr Cl ≥30 m L/min). Not recommended in severe renal impairment (Cr Cl <30 m L/min) due to lack of data.
No specific adjustment required; use caution in severe impairment (Cr Cl <30 m L/min) as data limited.
Contraindicated in Child-Pugh Class C (severe hepatic impairment). Use with caution in Child-Pugh Class A or B; no specific dose adjustment established, but monitor closely.
Contraindicated in severe hepatic impairment (Child-Pugh class C). For mild to moderate impairment, no adjustment recommended, but monitor liver function.
Not indicated for use in pediatric patients. Safety and efficacy have not been established.
Not indicated for use in children; safety and efficacy not established.
No specific dose adjustment recommended. Higher risk of adverse events (e.g., thromboembolism, stroke) in women >65 years of age; use lowest effective dose for shortest duration.
Not indicated for postmenopausal women. Use not recommended in elderly due to lack of efficacy in anovulation.
Estrogen therapy increases the risk of endometrial cancer in women with a uterus. Concomitant use of a progestin or bazedoxifene is required to reduce this risk. Cardiovascular disorders: Estrogen-alone therapy may increase risk of stroke and DVT. Estrogen plus progestin therapy increases risk of MI, stroke, invasive breast cancer, pulmonary emboli, and DVT. DUAVEE is not approved for cardiovascular disease prevention. Breast cancer: Estrogen plus progestin therapy increases risk of invasive breast cancer. Probable dementia: Estrogen plus progestin therapy increases risk in women 65+.
None
Cardiovascular disorders (stroke, DVT, MI, pulmonary embolism),Malignant neoplasms (endometrial cancer, breast cancer),Gallbladder disease,Hypertriglyceridemia,Fluid retention,Hypocalcemia,Hereditary angioedema,Exacerbation of endometriosis,Exacerbation of asthma, diabetes, migraine, porphyria, SLE, hepatic hemangiomas,Retinal vascular thrombosis
Ovarian hyperstimulation syndrome (OHSS),Ovarian enlargement,Visual disturbances (especially with prolonged use),Multiple pregnancy (increased risk),Ectopic pregnancy,Ovarian cancer risk (theoretical, based on prolonged use)
Undiagnosed abnormal genital bleeding,Known, suspected, or history of breast cancer,Known or suspected estrogen-dependent neoplasia,Active or past history of venous thromboembolism (VTE),Active or past history of arterial thromboembolism (e.g., stroke, MI),Known protein C, protein S, or antithrombin deficiency or other thrombophilic disorders,Hypersensitivity to any component,Pregnancy
Pregnancy (Category X),Liver disease or dysfunction,Undiagnosed abnormal vaginal bleeding,Ovarian cyst or enlargement not due to polycystic ovary syndrome,Hypersensitivity to clomiphene or components
Grapefruit juice may increase estrogen levels; avoid large amounts. No other significant food interactions. Alcohol may increase risk of liver issues; limit intake.
No specific food interactions. Avoid grapefruit as it may alter metabolism (theoretical due to CYP3A4 involvement).
DUAVEE (conjugated estrogens/bazedoxifene) is contraindicated in pregnancy. Estrogens may cause fetal harm; first trimester exposure is associated with congenital anomalies including cardiovascular and limb defects. Second and third trimester exposure increases risk of urogenital abnormalities and delayed cognitive development. Bazedoxifene is a selective estrogen receptor modulator; animal studies show embryotoxicity and fetotoxicity at clinically relevant doses.
Clomiphene citrate is contraindicated in pregnancy. It is associated with an increased risk of fetal malformations, including neural tube defects, specifically when exposure occurs during the first trimester. Second and third trimester risks are not well studied due to contraindication, but theoretical risks include ovarian hyperstimulation syndrome (OHSS) effects on pregnancy.
Contraindicated during breastfeeding. Estrogens and bazedoxifene are excreted in human milk; M/P ratio not reported. Estrogens may reduce milk production and quality. Potential for adverse effects in nursing infants.
Safety in breastfeeding is not established. Clomiphene may reduce milk production. The M/P ratio is unknown. It is generally not recommended during breastfeeding.
No dose adjustments applicable; do not use in pregnancy. Pharmacokinetic changes in pregnancy (increased clearance, volume of distribution) are irrelevant due to contraindication.
No dose adjustments are relevant as clomiphene is contraindicated in pregnancy. Pharmacokinetic changes in pregnancy are not applicable due to contraindication.
DUAVEE (conjugated estrogens/bazedoxifene) is indicated for moderate-to-severe vasomotor symptoms and osteoporosis prevention in postmenopausal women with a uterus. Avoid in women with intact uterus who are not on a progestin; bazedoxifene is the progestin component. Contraindicated in women with undiagnosed abnormal genital bleeding, known/suspected pregnancy, breast cancer, estrogen-dependent neoplasia, active DVT/PE, or history of these conditions. Monitor for thromboembolic events. Not for use in women with prior hysterectomy. Discontinue if jaundice or visual disturbances occur.
Monitor ovarian size via ultrasound to reduce risk of ovarian hyperstimulation syndrome (OHSS). Limit course to 3-6 cycles due to increased risk of ovarian tumors. Check pregnancy test before each cycle. Use with caution in liver disease.
Take DUAVEE once daily with or without food.,This medication is for postmenopausal women with a uterus; it contains both estrogen and a progestin-like drug to protect the uterine lining.,Do not use if you have any unexplained vaginal bleeding, are pregnant, have or have had breast cancer, blood clots, or liver disease.,Report promptly any signs of blood clots (leg pain/swelling, chest pain, sudden shortness of breath) or stroke (sudden headache, vision/speech changes).,DUAVEE may increase risk of gallbladder disease, dementia (if started after age 65), and endometrial hyperplasia if the progestin component fails.,Smoking while on DUAVEE increases risk of blood clots; avoid smoking.,DUAVEE does not prevent heart attack or stroke; in fact, it may increase cardiovascular risk, especially in older women.,Store at room temperature, away from moisture and heat.,If you miss a dose, take it as soon as possible; if almost time for the next dose, skip the missed dose and resume regular schedule. Do not double dose.,You will need regular medical check-ups including mammograms and pelvic exams.
Take exactly as prescribed, typically 50 mg daily for 5 days starting on day 5 of menstrual cycle.,Report abdominal pain, bloating, nausea, or weight gain (possible OHSS).,Avoid alcohol due to hepatotoxicity risk.,Most pregnancies occur within first 3 cycles; consider alternative after 6 cycles.,May cause visual disturbances; report blurred vision or spots.
No interactions on record
No interactions on record
Explore head-to-head clinical comparisons of other medications in the same therapeutic classes.
Common clinical questions about DUAVEE vs CLOMID, answered by our medical review team.
DUAVEE is a Selective Estrogen Receptor Modulator/Estrogen Combination that works by DUAVEE is a combination of conjugated estrogens (CE) and bazedoxifene (BZA). CE activates estrogen receptors (ERα and ERβ) to relieve menopausal symptoms; BZA is a selective estrogen receptor modulator (SERM) that antagonizes ER in the endometrium to prevent endometrial hyperplasia.. CLOMID is a Selective Estrogen Receptor Modulator that works by Competitive antagonist of estrogen receptors (ER) in hypothalamus and pituitary, leading to increased gonadotropin-releasing hormone (Gn RH) and subsequent LH and FSH release, stimulating ovulation.. They differ in pharmacokinetic profiles, FDA-approved indications, and side effect profiles.
Potency comparisons between DUAVEE and CLOMID depend on the specific clinical indication. These are agents from distinct pharmacological classes and are not directly interchangeable by dose. A physician or clinical pharmacist should guide any therapeutic switching decisions.
The standard adult dose of DUAVEE is: One tablet (conjugated estrogens 0.45 mg/bazedoxifene 20 mg) orally once daily.. The standard adult dose of CLOMID is: 50 mg orally once daily for 5 days, starting on day 5 of the menstrual cycle. May increase to 100 mg daily if no response.. Dosing should always be individualized based on indication, renal and hepatic function, age, and other patient factors.
No direct drug-drug interaction has been formally documented between DUAVEE and CLOMID in current clinical databases. However, individual patient risk factors including other medications, organ function, and comorbidities should always be evaluated by a qualified healthcare provider.
The maternal-fetal safety profiles differ. DUAVEE is classified as Category C. DUAVEE (conjugated estrogens/bazedoxifene) is contraindicated in pregnancy. Estrogens may cause fetal harm; first trimester exposure is associated with congenital anomalies includi. CLOMID is classified as Category C. Clomiphene citrate is contraindicated in pregnancy. It is associated with an increased risk of fetal malformations, including neural tube defects, specifically when exposure occurs. Always consult a maternal-fetal medicine specialist before taking either drug during pregnancy or lactation.