Progesterone for Women: Interactions Overview (Not Dosing Advice)
Researched by DoseRoutine Research TeamReviewed for accuracy by Nicholas Alexander, RSE, SO, PMPLast updated Educational reference only — not medical advice. Always confirm dosing and safety decisions with a licensed clinician.
Summary
This page is an interaction and education reference for prescribed progesterone — micronized progesterone (Prometrium, Utrogestan) most commonly, and less often synthetic progestins (medroxyprogesterone, norethindrone, drospirenone) used in combined HRT and contraception. Prescribing and dose are set by your clinician. What this page covers: how progesterone interacts with common supplements (magnesium, ashwagandha, kava), sedatives, SSRIs, CYP inducers, and other HRT components. Micronized progesterone is metabolized to allopregnanolone, a GABA-A modulator — which is why sedation and drug-interaction considerations differ meaningfully from synthetic progestins.
Key facts
| Studied dose range | Set by your prescriber — this page gives no dosing advice. |
|---|---|
| Common forms | Oral micronized progesterone (capsule), vaginal micronized progesterone, IM/depot progesterone, synthetic progestin tablets, progestin IUD (levonorgestrel), progestin implant, injectable DMPA |
| Evidence level | Strong |
| Main interaction risks | Sedation with concurrent GABA-active drugs and supplements; CYP3A4 inducers reduce blood levels |
What the research shows
Micronized progesterone is metabolized to allopregnanolone, a positive allosteric modulator of GABA-A receptors — the same mechanism as benzodiazepines and alcohol at high concentrations. This explains its sedative effect and why bedtime dosing is standard (Frontiers in Neuroendocrinology 2016).
The 2019 Lancet meta-analysis on HRT and breast cancer found that micronized progesterone is associated with a smaller breast-cancer signal than synthetic progestins (medroxyprogesterone, norethindrone), though data quality varies.
CYP3A4 metabolism means that potent inducers — St. John's wort, rifampin, phenytoin, carbamazepine — meaningfully lower progesterone blood levels and can compromise endometrial protection in combined HRT.
Vaginal progesterone bypasses first-pass metabolism, achieves higher local endometrial concentrations for lower systemic exposure, and largely avoids the oral-progesterone sedation profile — commonly used in fertility protocols.
Progestin-only contraception (mini-pill, IUD, implant, DMPA) is a separate pharmacology from micronized progesterone and has its own interaction and safety profile — always specify which one to your prescriber.
Turn this evidence into a personal safety check for Progesterone.
The interaction checker cross-references Progesterone against HRT, birth control, thyroid medication, SSRIs, and every other item in your stack — using the same clinical sources cited above.
Check Progesterone on the interaction checkerInteractions
Interaction risk is what makes women's-health supplements uniquely tricky — HRT, birth control, thyroid medication and SSRIs all share metabolic pathways with common botanicals. Each item below lists the mechanism and what to actually watch for.
- Alcohol, benzodiazepines, opioids, gabapentin, pregabalinMechanism: Additive GABA-A sedation from allopregnanolone metabolite.Watch for: Excessive sedation, falls in older women. Take oral progesterone at bedtime and be careful about combined use.Check Progesterone + Alcohol, benzodiazepines, opioids, gabapentin, pregabalin on the interaction checker
- Kava, valerian, ashwagandha (at high doses)Mechanism: Additive sedative effect.Watch for: Grogginess, cognitive slowing. Space dosing or reduce.Check Progesterone + Kava, valerian, ashwagandha (at high doses) on the interaction checker
- St. John's wortMechanism: CYP3A4 induction lowers progesterone levels; risks contraceptive failure and inadequate endometrial protection.Watch for: Do not combine.Check Progesterone + St. John's wort on the interaction checker
- Rifampin, phenytoin, carbamazepine, phenobarbital, some HIV medicationsMechanism: CYP3A4/CYP2C9 induction reduces progesterone levels.Watch for: Prescriber may adjust dose, route, or contraceptive plan.Check Progesterone + Rifampin, phenytoin, carbamazepine, phenobarbital, some HIV medications on the interaction checker
- Grapefruit juice (chronic high intake)Mechanism: Intestinal CYP3A4 inhibition; raises oral progesterone exposure.Watch for: More sedation than expected.Check Progesterone + Grapefruit juice (chronic high intake) on the interaction checker
- LevothyroxineMechanism: Progestins can modestly affect thyroid-binding globulin.Watch for: Recheck TSH 6–12 weeks after starting or changing progesterone.Check Progesterone + Levothyroxine on the interaction checker
- Vitex (chasteberry)Mechanism: Both affect progesterone signalling; complicates dose interpretation.Watch for: Usually not combined with prescribed progesterone.Check Progesterone + Vitex (chasteberry) on the interaction checker
- SSRIs and SNRIsMechanism: Both affect mood pathways; case reports of additive sedation with oral progesterone.Watch for: Monitor for over-sedation, especially in the first weeks.Check Progesterone + SSRIs and SNRIs on the interaction checker
Who should be cautious
- History of active liver disease.
- History of severe depression during previous progestin use.
- Undiagnosed abnormal vaginal bleeding.
- Pregnancy — micronized progesterone is used in some fertility protocols only under specialist supervision; synthetic progestins are typically avoided.
- Progestin allergy or severe intolerance history.
FAQ
Can I take supplements with progesterone?
Most are fine — vitamin D, omega-3, magnesium glycinate, collagen. What to be careful with: GABA-active supplements (high-dose ashwagandha, kava, valerian) can add to oral progesterone's sedative effect; St. John's wort meaningfully reduces progesterone levels via CYP3A4 induction; vitex overlaps mechanism. Add progesterone to the DoseRoutine interaction checker to see the full pair list.
Can I take progesterone with an SSRI?
Usually yes — SSRIs and prescribed progesterone are commonly co-managed. Watch for additive sedation with oral micronized progesterone at bedtime, especially in the first weeks. Vaginal progesterone largely avoids this. This is a prescriber conversation, not a supplement question.
How long does progesterone take to work?
For sleep-onset and mood effects, women often notice a change within days of starting oral micronized progesterone at bedtime. For endometrial protection in HRT, effects are measured over months. For fertility-cycle luteal support, protocols are defined day-by-day by your reproductive endocrinologist.
Micronized progesterone vs synthetic progestin?
Micronized progesterone (Prometrium, Utrogestan) is bioidentical to endogenous progesterone. Synthetic progestins (medroxyprogesterone, norethindrone, drospirenone) are structurally different molecules with different receptor affinities and different long-term risk profiles — the 2019 Lancet HRT analysis found smaller breast-cancer signals for micronized progesterone. Which one you take is a prescriber decision.
Does progesterone interact with birth control?
Progestin-only contraception (mini-pill, IUD, DMPA) and prescribed micronized progesterone are different products with different indications and pharmacology — always specify to your prescriber which one you're on. HRT-prescribed progesterone is usually not combined with hormonal contraception.
Why does oral progesterone make me sleepy?
Oral micronized progesterone is metabolized to allopregnanolone, which activates GABA-A receptors — the same pathway as benzodiazepines and alcohol. That's why standard practice is bedtime dosing. Vaginal progesterone largely bypasses this because it avoids first-pass hepatic metabolism.
Where can I check progesterone interactions?
Add your exact progesterone product (micronized oral, vaginal, or specific synthetic progestin) to the DoseRoutine interaction checker at doseroutine.com/interaction-checker along with all your other medications and supplements for pairwise flags.
Taking progesterone alongside HRT, birth control, or other supplements?
Get access to all DoseRoutine tools — check your full routine for interactions, log doses and get reminders.
Sign up freeSources
- The 2022 NAMS Hormone Therapy Position Statement.
- Schumacher M et al. Front Neuroendocrinol 2016 — Progesterone, allopregnanolone, and the nervous system.
- Beral V et al. Lancet 2019 — Type of progestogen in HRT and breast cancer risk.
- Cicinelli E et al. Fertil Steril 2000 — Direct transport of vaginal progesterone to the uterus.
- ACOG Practice Bulletin — Management of menopausal symptoms.
Source: DoseRoutine Library — doseroutine.com/library/womens-health/progesterone-women