Estrace vs. Prometrium

See how Estrace and Prometrium compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Estrace is an estrogen used for menopause symptoms and vaginal atrophy, while Prometrium is a progesterone used mainly to protect the uterus during estrogen therapy.

  • Estrace is a daily tablet available in several strengths, while Prometrium is a bedtime capsule taken for part of each cycle rather than every day long-term.

  • Estrace has a much lower typical list price than Prometrium, though both carry boxed warnings for cardiovascular disease and probable dementia.

Estrace vs. Prometrium Drug Summary

Estrace

Estrace is an oral estradiol tablet, a type of estrogen used to treat moderate to severe menopause symptoms, vaginal atrophy, and to help prevent postmenopausal osteoporosis. It is also used for hypoestrogenism and as palliative treatment for certain breast and prostate cancers. Estrace is taken once daily at doses ranging from 0.5 mg to 2 mg, with higher doses reserved for cancer treatment.

Prometrium

Prometrium is an oral micronized progesterone capsule used to protect the uterine lining in postmenopausal women taking estrogen and to treat secondary amenorrhea. It is taken at bedtime, typically 200 mg daily for 12 days of a 28-day cycle or 400 mg for 10 days. Prometrium is also used off-label for fertility support and premenstrual symptoms.

Estrace vs. Prometrium Side Effects

Estrace

Most common
headache
nausea
breast tenderness/enlargement
abdominal cramping/bloating

Prometrium

Most common
dizziness (up to 16%)
breast pain (up to 11%)
headache (up to 10%)
abdominal pain (up to 10%)

Estrace vs. Prometrium Dosage

Estrace

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 10 mg three times daily At the start
Maximum dose 10 mg three times daily Same as starting
Dose changes None Fixed dose

Prometrium

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 200 mg once daily At the start
Maximum dose 400 mg once daily If needed
Dose changes 1 increase As tolerated

Estrace vs. Prometrium Indications

Estrace

Estrace treats the hormonal changes of menopause, including hot flashes and vaginal dryness, and helps prevent bone loss after menopause. It is also approved for hypoestrogenism from ovarian failure or surgery, and at higher doses for palliative treatment of certain breast and prostate cancers.

  • Moderate to severe hot flashes and night sweats

  • Vaginal dryness and irritation from menopause

  • Low estrogen from ovarian failure or surgery

  • Prevention of postmenopausal osteoporosis

  • Palliative treatment of certain cancers

Prometrium

Prometrium is FDA-approved to prevent overgrowth of the uterine lining in postmenopausal women taking estrogen, and to treat secondary amenorrhea. Doctors also prescribe it off-label for fertility support, premenstrual symptoms, and as part of combined hormone replacement therapy.

  • Prevent endometrial hyperplasia with estrogen use

  • Secondary amenorrhea

  • Off-label: luteal phase support in fertility care

  • Off-label: premenstrual syndrome (PMS/PMDD)

  • Off-label: combined hormone replacement therapy

Estrace vs. Prometrium Pros and Cons

Estrace

Estrace has decades of clinical use and covers a wider range of approved indications than Prometrium, including osteoporosis prevention and cancer palliation. Like all systemic estrogens, it carries boxed warnings for cardiovascular events, dementia, and endometrial cancer when used without a progestin.

Pros

  • Approved for a wider range of conditions than Prometrium

  • Multiple tablet strengths allow flexible dosing

  • Roughly $8 to $65 per month before insurance, much less than Prometrium

Cons

  • Requires added progestin in women with a uterus to prevent cancer risk

  • Boxed warning for cardiovascular disease and probable dementia

  • 2 mg tablet contains a dye that can trigger allergic reactions

Prometrium

Prometrium's natural progesterone is often preferred for protecting the uterus during estrogen therapy, and it is widely used off-label for fertility and cycle-related symptoms. It shares the same class boxed warnings as Estrace and is significantly more expensive at typical list prices.

Pros

  • Bioidentical progesterone matches the body's own hormone

  • Widely used off-label for fertility and PMS/PMDD support

  • Only needs to be taken part of each cycle, not daily long-term

Cons

  • Roughly $497 to $936 per month before insurance, far more than Estrace

  • Contains peanut oil, unsafe for people with peanut allergy

  • Approved for fewer conditions than Estrace

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