HRT patches explained: doses, use, side effects and switching
Why transdermal oestrogen is the modern default, how patches are dosed, what to do when one falls off, and what to expect in the first three months.
Patches have become the default starting point for in the UK for a straightforward reason: oestrogen absorbed through the skin bypasses the liver, and with it the clot risk associated with the oral route.
In short: HRT patches deliver body-identical oestrogen through the skin, usually changed twice weekly. Transdermal oestrogen is not associated with the increased clot risk seen with oral oestrogen. Anyone with a uterus also needs progesterone to protect the womb lining.
Why transdermal
Swallowed passes through the liver first, which affects clotting factors. Absorbed through skin, it does not. That single difference is why patches, gels and sprays are widely preferred, particularly for women with migraine, raised BMI, or a history of clot risk factors.
How dosing usually works
Patches come in a range of strengths, commonly 25, 50, 75 and 100 micrograms. Most women start low and titrate upwards based on symptom response rather than blood levels. It is normal to need more than the starting dose, and it is normal for that to take a few months to establish.
The progesterone half
If you have a uterus, oestrogen alone is not appropriate. Progesterone protects the womb lining. Micronised progesterone taken at night is the common UK choice, either continuously or cyclically depending on where you are in the transition. A hormonal coil is an alternative that provides endometrial protection and contraception together.
Practical use
- Apply to clean, dry skin below the waist - buttock or upper thigh. Not the breast.
- Rotate sites to reduce skin irritation.
- Change on the same two days each week.
- Patches usually survive showering, swimming and exercise. If one falls off, replace it and keep your usual change days.
- Heat increases absorption, so saunas and hot baths can produce temporary symptom changes.
What to expect in the first three months
Breast tenderness, mild nausea and some bleeding pattern change are common early and usually settle. Persistent bleeding beyond three to six months should be reviewed. Symptom improvement often begins within weeks for sleep and vasomotor symptoms; mood and cognition can take longer.
Switching
Moving between patch, gel and spray is common and is a dose conversation rather than a failure. Skin irritation, inconsistent absorption or personal preference are all reasonable reasons to change form.
Common questions
Are HRT patches safe? For most healthy women starting within ten years of their final period, the benefits outweigh the risks, and transdermal routes avoid the clot risk associated with oral oestrogen. Your history matters, so this is a clinician conversation.
Can I use patches in while still having periods? Yes. HRT is used during perimenopause, usually with cyclical progesterone.
Do patches provide contraception? No. Contraception is still needed until the appropriate point after your final period.
This is information, not medical advice. Discuss any change with your prescriber.
Read the perimenopause guide or find a menopause specialist.