The short answer
Unboosted integrase inhibitor regimens such as Biktarvy, Dovato and Triumeq, and newer NNRTIs such as rilpivirine and doravirine, have no clinically significant interaction expected with estradiol. Ritonavir- or cobicistat-boosted regimens and older enzyme-inducing NNRTIs such as efavirenz can change hormone levels, so clinicians adjust doses and monitor symptoms rather than changing your ART.
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How these interactions work
Estradiol and most progestogens are processed in the liver by enzymes, mainly CYP3A4, and by glucuronidation. Some HIV medicines speed up or slow down those pathways. That changes how much hormone reaches your bloodstream, but the direction of the effect is not always obvious: ritonavir, for example, inhibits CYP3A4 but induces glucuronidation, so estradiol levels can fall.
Transdermal estradiol avoids first-pass metabolism in the liver, which is one reason it is preferred and tends to be less affected.
Interaction risk by ART class
| ART class | Examples | Expected effect | Usual approach |
|---|---|---|---|
| Unboosted integrase inhibitors | Bictegravir, dolutegravir, raltegravir, cabotegravir | No clinically significant interaction expected | Standard dosing |
| Newer NNRTIs | Rilpivirine, doravirine | No clinically significant interaction expected | Standard dosing |
| NRTI backbones | Tenofovir (TAF, TDF), emtricitabine, lamivudine, abacavir | No meaningful hormone interaction | Standard dosing; TDF relevant for bone |
| Boosted protease inhibitors | Darunavir or atazanavir with ritonavir or cobicistat; lopinavir/ritonavir | Estradiol may fall; some progestogens may rise | Titrate estradiol to symptoms; choose progestogen carefully |
| Cobicistat-boosted integrase | Elvitegravir/cobicistat (Genvoya, Stribild) | Hormone levels may change | Check combination; adjust and monitor |
| Enzyme-inducing NNRTIs | Efavirenz, nevirapine, etravirine | Estradiol and progestogen levels may fall | Higher estradiol dose; consider hormonal IUD for womb protection |
How clinicians manage interactions
- Check the exact combination on the Liverpool HIV Drug Interactions checker before prescribing.
- Start transdermal estradiol at a usual dose and adjust over weeks based on symptom relief.
- For womb protection with an inducer, consider the levonorgestrel IUD, which acts locally and is less affected.
- Review other medicines too: statins, antidepressants, seizure medicines, TB drugs and St John’s wort all matter.
- Share the plan with your HIV clinician so both teams know your full medicine list.
Interactions with non-hormonal options
Non-hormonal treatments have their own interaction profiles. Elinzanetant (Lynkuet) is metabolized by CYP3A4, and its label advises avoiding strong CYP3A inhibitors and inducers, which includes boosted regimens and efavirenz. Fezolinetant (Veozah) is metabolized by CYP1A2, so boosters are less relevant, but it carries liver monitoring requirements. SNRIs and gabapentin generally have few ART interactions, though some combinations still need checking.
Signs your dose may need review
- Hot flashes returning or not improving after 8 to 12 weeks
- New breast tenderness, bloating or spotting after a regimen change
- Any change in your ART: tell your menopause clinician
Specialized care pathway
Menopause care that works alongside your HIV care
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Questions, answered
Common questions
Does Biktarvy interact with estrogen?
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No clinically significant interaction is expected between bictegravir/emtricitabine/TAF and estradiol. Clinicians still confirm the combination on the Liverpool HIV Drug Interactions checker.
Can I take HRT with a boosted protease inhibitor?
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Yes, with adjustments. Ritonavir and cobicistat can lower estradiol and raise some progestogen levels. Clinicians usually use transdermal estradiol, titrate to symptoms and choose the progestogen carefully.
Does efavirenz affect hormone therapy?
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Efavirenz induces liver enzymes and can lower estradiol and progestogen levels. A higher estradiol dose or a levonorgestrel IUD for womb protection may be considered. Your clinician decides.
Will HRT make my ART less effective?
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Estradiol and standard progestogens are not expected to lower ART levels enough to affect viral suppression. Keep taking ART as prescribed and tell both teams about every medicine.
What is the Liverpool HIV drug interactions checker?
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It is a free, widely used database from the University of Liverpool that rates interactions between HIV medicines and other drugs. Clinicians use it to check each combination before prescribing.
WRITTEN & MEDICALLY REVIEWED BY
Kindr Health Clinical Team
Kindr Health Inc. — Editorial & Clinical Team, led by Kevin Wolfe, CMO
Kindr’s clinical content is written and reviewed by board-certified clinicians who prescribe hormone therapy every day across all 50 states — menopause-focused physicians, nurse practitioners, and pharmacists working under Kindr Health, Inc.’s organizational clinical oversight. Every page is checked against current NAMS and ACOG guidance, FDA labeling, and the primary literature before publication, then re-reviewed on a rolling schedule when guidance changes.
Organizational NPI 1609792902 · Last reviewed October 4, 2026 · Editorial policy
Educational content only — not a substitute for individual medical advice, diagnosis, or treatment.
SOURCES & REFERENCES
Every clinical claim on this page is sourced.
- HIV Drug Interactions Checker — University of Liverpool. www.hiv-druginteractions.org/checker
- Guidelines for the Use of Antiretroviral Agents: Drug-Drug Interactions — DHHS, Clinicalinfo.HIV.gov. clinicalinfo.hiv.gov/en/guidelines/hiv-clinical-guidelines-adult-and-adolescent-arv/drug-interactions-overview
- Guidelines for the Use of Antiretroviral Agents in Adults and Adolescents with HIV: Women with HIV — DHHS, Clinicalinfo.HIV.gov. clinicalinfo.hiv.gov/en/guidelines/hiv-clinical-guidelines-adult-and-adolescent-arv/women-hiv
- EACS Guidelines (drug-drug interactions and menopause sections) — European AIDS Clinical Society. www.eacsociety.org/guidelines/eacs-guidelines
- The 2022 Hormone Therapy Position Statement of The North American Menopause Society (2022) — The Menopause Society. www.menopause.org/docs/default-source/professional/nams-2022-hormone-therapy-position-statement.pdf
- LYNKUET (elinzanetant) prescribing information — DailyMed, U.S. National Library of Medicine. dailymed.nlm.nih.gov/dailymed/search.cfm?query=elinzanetant
- VEOZAH (fezolinetant) prescribing information — DailyMed, U.S. National Library of Medicine. dailymed.nlm.nih.gov/dailymed/search.cfm?query=fezolinetant