Switching guide
How to transition from birth control to HRT for perimenopause
Transition typically done 1-2 years before expected menopause or if BC masking symptoms.
Reviewed by ClearHormones Editorial Team · Updated 2026-04-20
Why switch
- Past age 45 + still on BC
- Symptoms unresolved on BC
- Want physiologic dosing instead of contraceptive doses
Why not to switch
- Still want contraception (HRT not contraceptive)
- Cycles still regular + no symptoms
Step-by-step
- Confirm need for transitionFSH check after 7-day pill-free interval may confirm peri/menopause status (>30 mIU/mL suggests transition).
- Choose HRT regimenTransdermal estradiol (patch/gel/spray) + progesterone (if uterus present). Lower estrogen dose than BC.
- Stop BC, start HRT immediatelyNo washout needed. Start HRT day after last BC dose to prevent symptom break.
- Add contraception if neededHRT doesn't prevent pregnancy. Add condoms, IUD, or await 12 months amenorrhea + age 50+.
- 6-week reassessmentAdjust dose if symptoms persist. Repeat estradiol levels if uncertain.
- Confirm need for transition(Week 0)FSH check after 7-day pill-free interval may confirm peri/menopause status (>30 mIU/mL suggests transition).
- Choose HRT regimen(Week 0)Transdermal estradiol (patch/gel/spray) + progesterone (if uterus present). Lower estrogen dose than BC.
- Stop BC, start HRT immediately(Week 1)No washout needed. Start HRT day after last BC dose to prevent symptom break.
- Add contraception if needed(Week 1)HRT doesn't prevent pregnancy. Add condoms, IUD, or await 12 months amenorrhea + age 50+.
- 6-week reassessment(Week 6)Adjust dose if symptoms persist. Repeat estradiol levels if uncertain.
⚠ Warnings
- HRT not contraceptive
- Bleed patterns differ from BC
- May reveal masked uterine pathology
Other switching guides
Not medical advice. Always discuss medication changes with your prescriber. See our editorial methodology.