What It Is
If you have a uterus and take estrogen, you need progestogen. This is non-negotiable. Estrogen without progestogen stimulates the uterine lining and increases the risk of endometrial hyperplasia and cancer. The question is not whether to add progestogen but which one, how to take it, and whether to use a fixed combination product or separate prescriptions.
The separate-prescription approach (generic estradiol plus generic micronized progesterone) is typically cheaper, more flexible, and uses the progestogen with the most favorable emerging evidence profile. Yet many clinics default to fixed combinations because they are simpler to prescribe.
Product-Specific Details
Activella (estradiol 1mg / norethindrone acetate 0.5mg). Continuous combined oral tablet. Generic available ($30 to 80 per month). Convenient single product. Uses norethindrone (synthetic progestin), not micronized progesterone.
CombiPatch (estradiol / norethindrone acetate transdermal). Continuous combined patch, changed twice weekly. Provides the transdermal VTE advantage in a single product. $80 to 200 per month. No generic.
Prempro (conjugated estrogens 0.625mg / MPA 2.5mg). The specific product studied in the WHI. Continuous combined oral. No generic available. Brand only (approximately $220 to 320 per month without insurance). Uses CEE and MPA - neither bioidentical.
Separate prescriptions (estradiol + micronized progesterone). $20 to 65 per month for both generics. Maximum flexibility to adjust each component independently. Uses bioidentical hormones with the most favorable evidence profile. Most menopause specialists use this approach.
Continuous vs Cyclic
Continuous combined: both hormones daily. Goal is no monthly bleeding. Breakthrough spotting common in first 3-6 months (up to 40 to 50% of women). Best for women at least 1-2 years past their final period.
Cyclic: estrogen daily, progestogen for 12-14 days per month. Produces predictable withdrawal bleed. Better for perimenopausal women and early postmenopause. See the dosing guide for full details and calendar examples.
Breakthrough Bleeding
Months 1 to 3: spotting is expected on continuous therapy. Do not stop or change regimen. Months 3 to 6: should be decreasing. If worsening, contact clinician. After 6 months: persistent bleeding warrants endometrial evaluation (ultrasound and possibly biopsy).
Cost
Separate generics: $20 to 65 per month. Fixed oral combinations: $30 to 100 per month. CombiPatch: $80 to 200 per month. The separate-prescription approach is usually the cheapest and most flexible.
The WHI Context
The WHI studied Prempro (CEE + MPA). Whether estradiol + micronized progesterone carries the same risk profile is an active area of research, with emerging evidence suggesting potentially lower breast cancer risk with micronized progesterone. Ask your clinician which specific combination they are prescribing and how its evidence base compares.
Questions To Ask
- Are you prescribing separate components or a fixed combination, and why?
- Which progestogen are you using - micronized progesterone or synthetic?
- Should I be on continuous or cyclic based on my menopausal stage?
- What bleeding pattern should I expect and report?