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
Prometrium
Climara vs. Prometrium Dosage
Climara
Prometrium
| 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 |
| 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
| 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
| 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
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