Irregular cycles have two main midlife causes: perimenopause OR PCOS. Treatment differs sharply.
Cycle irregularity can mean perimenopause (cycles lengthen, eventually stop) or PCOS (cycles longer than 35 days, anovulation). Workup distinguishes the two.
Perimenopause: typically 40s. PCOS: persists from teens but can worsen in 30s-40s. Both share insulin resistance contributions.
All options below are real published treatments. Evidence-level reflects current clinical guidelines (NAMS / ACOG / Endocrine Society). Cost ranges are starting price estimates from $US public sources.
Monthly cost
$5-$50 generic
Side effects
nausea, breakthrough bleeding, breast tenderness
Regulates cycles + reduces bleeding in both conditions. Use in perimenopause limited by VTE risk over age 35 if smoker.
Contraindications: Smoker over 35, history of VTE, migraines with aura
Providers offering this: pandia health, tia womens health
Monthly cost
$20-$80
Side effects
mood changes, breast tenderness
Days 14-28 each cycle to induce regular withdrawal bleed + protect endometrium. Useful when estrogen levels still adequate.
Providers offering this: midi health, alloy womens health
Monthly cost
$5-$20 generic
Side effects
GI upset, diarrhea, B12 depletion long-term
Off-label for PCOS. Improves ovulation in ~⅓ of women + reduces insulin resistance. Required if obesity or impaired glucose tolerance.
Providers offering this: allara, pollie pcos specialist, curio wellness pcos
Monthly cost
$0
Side effects
minimal
Even modest weight loss restores ovulation in many with PCOS. Combined with med therapy.
Onset age (PCOS typically teens; peri typically 40s), accompanying symptoms (PCOS: acne/hirsutism/insulin resistance; peri: hot flashes/sleep changes), and labs (peri: rising FSH/LH ratio normalizes; PCOS: anti-mullerian hormone elevated, LH:FSH ratio >2).
Last verified 2026-06-01. Treatment guidelines update — confirm with your clinician.