Systemic hormone therapy means estrogen that circulates through your body, with progesterone added if you still have a uterus. It is the most effective treatment for moderate to severe hot flashes and night sweats, it treats genitourinary symptoms, and it preserves bone density and reduces fractures. Whether it is right for you depends on your age, how long it has been since menopause, and your personal history — which is why the screening conversation comes before the prescription.
Who this is for
Women with moderate to severe hot flashes or night sweats that are affecting sleep, work, or quality of life
Women under 60, or within 10 years of their final period, where the balance of benefit and risk is most favorable
Women who need bone protection and also have menopausal symptoms
Women whose periods stopped before 45, or who had their ovaries removed early, where treatment is usually recommended until the average age of menopause
Women with genitourinary symptoms who also have whole-body symptoms — if genitourinary symptoms are the only problem, local vaginal estrogen is the better starting point
What it is
Systemic hormone therapy replaces some of the estrogen your ovaries no longer make, at a dose meant to control symptoms rather than to recreate the levels of your thirties. If you still have a uterus, a progestogen is always included — estrogen alone stimulates the uterine lining and raises the risk of endometrial cancer, and progesterone prevents that. This is not optional and there is no dose of estrogen low enough to skip it.
Everything we prescribe is FDA-approved. That means the dose in the product is the dose on the label, the purity is tested, and the product has been studied.
How we choose a product
Most women start on transdermal estradiol — a patch, gel, or spray. Estrogen absorbed through skin bypasses first-pass metabolism in the liver, and observational studies consistently associate transdermal delivery with lower venous clot risk than oral estrogen. If you have any clot risk factor, that decision is easy.
For the progestogen, micronized progesterone at bedtime is our usual choice. For women in perimenopause who also need contraception and bleeding control, a levonorgestrel intrauterine system often does three jobs at once.
We start low, wait about 8 to 12 weeks, and adjust against your symptom score rather than against a blood level. Blood estradiol levels do not correlate well with symptom relief and we do not chase a target number.
What happens after you start
You will hear from us. The app tracks your hot flash count and a symptom score, so the follow-up conversation is about your data rather than your memory of the last three months.
We ask specifically about bleeding. Spotting in the first three to six months of continuous therapy is common and usually settles. Bleeding that starts after a settled period, is heavy, or continues past six months is evaluated — typically with an ultrasound and often an endometrial biopsy. We would rather look and find nothing.
At least once a year we review the whole picture: what your symptoms are doing now, what has changed in your health, whether the dose is still right, and whether to continue. Stopping is a legitimate outcome of that conversation, and so is continuing.
Options
FDA-approved systemic options we commonly prescribe. Dose and product are chosen with you.
Form
How it is taken
Typical use
Transdermal estradiol patch
Applied to the skin, changed once or twice a week
Often our default. Skin delivery avoids first-pass liver metabolism and observational data suggest a lower clot risk than oral estrogen.
Estradiol gel, spray, or emulsion
Applied to the skin daily
Same delivery advantage as a patch, for women who find patches irritating or who want finer dose adjustment.
Oral estradiol or conjugated estrogens
A tablet once a day
Effective and inexpensive. Usually avoided where clot risk, high triglycerides, or gallbladder disease are concerns.
Micronized progesterone
A capsule at bedtime, nightly or cyclically
Added whenever you still have a uterus, to protect the uterine lining. Taken at night because it is mildly sedating.
Levonorgestrel intrauterine system
Placed in the uterus, replaced every few years
An alternative way to protect the lining, useful in perimenopause because it also controls bleeding and provides contraception.
Conjugated estrogens with bazedoxifene
A tablet once a day
A progesterone-free option for women with a uterus who do not tolerate progesterone.
What the evidence supports
Each claim below carries a rating. Strong means randomized trials and current
specialty guidelines support it. Moderate means the evidence is real but has
meaningful limits. Limited means early, small, or indirect evidence — and where we
say Limited, that is us telling you not to count on it.
Reduces the frequency and severity of hot flashes and night sweats
Evidence for Reduces the frequency and severity of hot flashes and night sweats:● Strong evidence
Consistently the most effective available treatment in randomized trials, typically reducing moderate to severe hot flash frequency by around 75 percent compared with placebo. This is the indication with the clearest evidence.
Treats vaginal dryness and painful sex
Evidence for Treats vaginal dryness and painful sex:● Strong evidence
Systemic estrogen improves genitourinary symptoms for most women. When those are the only symptoms, low-dose vaginal estrogen treats them at least as well with far less systemic exposure.
Preserves bone density and reduces fractures
Evidence for Preserves bone density and reduces fractures:● Strong evidence
The Women's Health Initiative showed reductions in hip, vertebral, and total fractures in women taking hormone therapy — demonstrated in a randomized trial, which is unusual for a fracture outcome.
Improves sleep that is disrupted by night sweats
Evidence for Improves sleep that is disrupted by night sweats:● Moderate evidence
When vasomotor symptoms are what wake you, treating them improves sleep quality. Hormone therapy is not established as a treatment for insomnia that is not driven by hot flashes.
Improves energy, mood, memory, weight, or longevity
Evidence for Improves energy, mood, memory, weight, or longevity:● Limited evidence
We do not offer hormone therapy for these reasons. It may help some women indirectly by improving sleep and symptoms, but trials have not established these as benefits, and it is not prescribed for dementia prevention, weight loss, or anti-ageing purposes.
Local therapy for genitourinary symptoms, with minimal systemic absorption.
Common questions
Didn't a big study show hormone therapy is dangerous?
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The Women's Health Initiative, published in 2002, enrolled women whose average age was 63 — more than a decade past menopause for most of them. Later analyses by age showed that women who started within 10 years of menopause, or under 60, had a different balance of risk and benefit than women who started much later. The headline in 2002 was applied to every woman regardless of age, and that has taken two decades to correct.
What happened to the boxed warning?
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In late 2025 the FDA removed the class-wide boxed warning from systemic and vaginal estrogen product labeling. That is a change in labeling that reflects how the evidence has been reinterpreted by age and by product. It does not mean hormone therapy is proven safe for everyone. Individual risk is still assessed, and we still go through your history before prescribing.
Is body-identical or compounded hormone therapy better?
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FDA-approved estradiol and FDA-approved micronized progesterone are already structurally identical to the hormones your ovaries made — they are bioidentical, and they come with tested purity, verified dosing, and a label. Compounded preparations add cost and dosing uncertainty without adding benefit, and implanted hormone pellets are not something we use. We prescribe FDA-approved products only.
How long can I stay on it?
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There is no arbitrary stopping date and no rule that you must stop at five years or at 65. What matters is a real conversation at least annually about your symptoms, your risk profile, and what has changed. Some women taper after a few years; others continue longer, especially where bone protection is part of the reason.
I had breast cancer. Can I take hormone therapy?
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Systemic hormone therapy is generally not used after breast cancer. There are effective non-hormonal treatments for hot flashes that we use instead. Low-dose vaginal estrogen for genitourinary symptoms is a separate question and may be an option for some survivors with input from your oncologist.
What are the actual risks?
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The main ones we discuss are venous blood clots, which are lower with skin-delivered estradiol than with oral estrogen; stroke, where absolute risk is low in women under 60 and rises with age at initiation; and breast cancer, where combined estrogen-plus-progestogen therapy is associated with a small increase in risk that grows with duration, while estrogen alone in women without a uterus was not. We give you the numbers for your situation rather than adjectives.
Medically reviewed by PLACEHOLDER — Medical Director, MD · Reviewed
· Updated PLACEHOLDER: replace with the reviewing clinician before launch.
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