Climara vs. Prometrium

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

Key Takeaways

  • Climara is a once-weekly estrogen patch that treats hot flashes, vaginal atrophy, and low estrogen, while Prometrium is an oral progesterone taken at bedtime to protect the uterus during estrogen therapy.

  • Both carry boxed warnings for blood clots, stroke, heart attack, breast cancer, and possible dementia risk in women 65 and older.

  • They are often prescribed together: Climara replaces estrogen and Prometrium protects the uterine lining, since estrogen alone can raise endometrial cancer risk in women with a uterus.

Climara vs. Prometrium Drug Summary

Climara

Climara is a steroidal estrogen delivered through a once-weekly transdermal patch. It treats moderate to severe hot flashes and vaginal atrophy from menopause, low estrogen from ovarian failure or castration, and helps prevent postmenopausal osteoporosis. The patch is changed once a week and comes in six dose strengths for individualized titration.

Prometrium

Prometrium is a bioidentical, micronized progesterone taken as an oral capsule at bedtime. Its main FDA-approved role is protecting the uterine lining in postmenopausal women taking estrogen, along with treating secondary amenorrhea. It is chemically identical to the progesterone the body makes naturally, but the capsules contain peanut oil.

Climara vs. Prometrium Side Effects

Climara

Most common
abdominal pain (≥10%)
headache (≥10%)
breast pain (≥10%)
generalized pain (≥10%)

Prometrium

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

Climara vs. Prometrium Dosage

Climara

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 0.025 mg/day patch At the start
Maximum dose 0.1 mg/day patch If needed
Dose changes 5 increases As tolerated

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

Climara vs. Prometrium Indications

Climara

Climara is FDA-approved for menopause-related hot flashes, vaginal and vulvar atrophy, and low estrogen from ovarian failure, hypogonadism, or castration. It is also approved to help prevent osteoporosis after menopause. Some clinicians prescribe it off-label as part of feminizing hormone therapy for transgender women.

  • Moderate to severe hot flashes from menopause

  • Vulvar and vaginal atrophy from menopause

  • Low estrogen from ovarian failure, hypogonadism, or castration

  • Prevention of postmenopausal osteoporosis

  • Off-label: feminizing hormone therapy for transgender women

Prometrium

Prometrium is FDA-approved to prevent endometrial hyperplasia in postmenopausal women who still have a uterus and are taking estrogen, and to treat secondary amenorrhea. It is also used off-label for luteal phase support in fertility treatment, preterm birth prevention, and PMS or PMDD. When paired with estrogen therapy like Climara, it protects the uterine lining from overgrowth.

  • Prevention of endometrial hyperplasia with estrogen therapy

  • Treatment of secondary amenorrhea

  • Off-label: luteal phase support in IVF/fertility treatment

  • Off-label: prevention of preterm birth after prior early delivery

  • Off-label: PMS and PMDD symptom management

Climara vs. Prometrium Pros and Cons

Climara

Climara delivers estrogen through the skin, which bypasses liver metabolism and may lower clot risk compared with oral estrogens. It comes in six patch strengths, giving flexibility for dose adjustments, and its list price is far lower than Prometrium's.

Pros

  • Skin delivery may carry lower blood clot risk than oral estrogen

  • Six patch strengths allow fine dose adjustments

  • Only changed once a week

Cons

  • Can cause skin irritation at the patch site

  • Must be rotated to different skin areas to avoid irritation

  • Needs a separate progestin like Prometrium if the uterus is intact

  • Patch can loosen with swimming, bathing, or heavy sweating

Prometrium

Prometrium is chemically identical to the body's own progesterone, which some patients and clinicians prefer over synthetic progestins. It is taken as a capsule rather than a patch, but its list price runs far higher than Climara's, and it is not an option for anyone with a peanut allergy.

Pros

  • Bioidentical to the progesterone the body naturally makes

  • Oral capsule may be preferred by patients who dislike patches

  • Cyclic dosing schedule fits standard hormone therapy regimens

Cons

  • Contains peanut oil, unsafe for anyone with a peanut allergy

  • Must be taken daily at bedtime rather than once a week

  • Roughly $497 to $936 per month without insurance, much costlier than Climara

  • Not effective alone for hot flashes or vaginal atrophy

Common Symptoms and Related Diseases You Can Explore

Explore a range of common symptoms the Doctronic Symptom Checker can help you understand.