--- title: Neurosteroids: definition and link to PMS and PMDD description: Neurosteroids are molecules the brain makes to adjust mood within minutes, and allopregnanolone, made from progesterone, reacts differently in PMDD. url: https://niyora.com/glossary/neurosteroids/ --- - [Niyora](https://niyora.com/) - [Glossary](https://niyora.com/glossary/) - Neurosteroids: what it means Term # Neurosteroids: what it means Neurosteroids are hormone-like molecules the brain makes or quickly converts, and they can shift how calm or anxious you feel within minutes. Allopregnanolone, made from progesterone, is the main one linked to PMS and PMDD. In PMDD, the brain seems to react differently to its normal rise and fall, not to an abnormal amount of it. Updated 14 October 2026 Niyora editorial ## At a glance - Neurosteroids are molecules the brain makes, often from hormones like progesterone, that act on brain receptors within minutes rather than hours. - Allopregnanolone, built from progesterone, is the best-studied neurosteroid in PMS and PMDD, and it usually calms brain activity by acting on GABA-A receptors. - PMDD is a different reaction to normal hormone changes, not a sign of abnormal hormone levels. - Trials testing drugs that change allopregnanolone levels (dutasteride, sepranolone) have shown mixed, early results for PMDD symptoms. - A doctor decides on treatment, SSRIs, certain hormonal contraceptives or CBT; drugs that target neurosteroids directly aren't yet standard care. ## What are neurosteroids? Neurosteroids are hormone-like molecules the brain makes or quickly converts from steroid hormones, and they act directly on nerve cells rather than traveling through the blood to distant organs the way most hormones do. Three things define them: - They're built in or near the brain, often from hormones like progesterone. - They act fast, changing nerve-cell activity within minutes instead of hours [1]. - **Allopregnanolone**, made from progesterone, is the one most tied to the menstrual cycle. Allopregnanolone binds to GABA-A receptors, the same receptors sedatives and anti-anxiety medicines target, and usually calms brain activity down. For more on how it's built and what it does, see [Allopregnanolone: what it means](https://niyora.com/glossary/allopregnanolone/). It's the neurosteroid that comes up most in [PMDD (premenstrual dysphoric disorder), explained](https://niyora.com/pmdd/). ## How do neurosteroids relate to PMS and PMDD? Progesterone rises through the [luteal phase](https://niyora.com/luteal-phase/) and falls sharply in the days before a period, and allopregnanolone rises and falls along with it. For most women, that swing passes without much notice. In PMDD, the GABA-A receptor seems to respond to the same rise and fall with a **different reaction**, so a normal drop in allopregnanolone can bring on anxiety, irritability or a low mood instead of calm. PMDD is a different reaction to normal hormone changes, not a sign of abnormal hormone levels (Schmidt et al., 1998, NEJM; Dubey et al., 2017, Molecular Psychiatry). A review of hormone studies found luteal estradiol tends to run a little lower in women with PMDD, but this is a correlation seen across studies, not evidence that PMDD comes from abnormally low hormones on their own [2]. None of this makes the feelings less real. It means a biological switch, how sensitive your brain is to its own neurosteroids, flips differently for some people the week before a period. For the fuller hormone picture, see [Menstrual cycle hormones, phase by phase](https://niyora.com/cycle/menstrual-cycle-hormones/). ## What does the research say? Several trials have tested what happens when neurosteroid levels change. - Dutasteride, which blocks progesterone from converting into allopregnanolone, reduced core PMDD symptoms like irritability, sadness and anxiety at a higher dose, though not at a lower one [3]. - Sepranolone, which blocks allopregnanolone's effect on the GABA-A receptor, has been tested as a luteal-phase treatment in two trials, with mixed results on the main symptom score [4] [6]. - Brain imaging shows women with PMDD have different amygdala activity than women without PMDD during the luteal phase [5]. In one trial, women with PMDD randomized to a progesterone-receptor-modulating treatment showed different fronto-cingulate brain reactivity during an aggression task than those randomized to placebo [7]. - A steroid-metabolite study found women with PMDD process certain hormone signals differently from women without the condition, even when hormone levels were controlled in the lab [8]. None of these drugs are approved treatments yet. They're evidence that the allopregnanolone and GABA-A system is a real, measurable part of PMDD, not proof of a fix. For more findings like these, see [PMS and PMDD research, summarised](https://niyora.com/research/). ## Why does it matter for treatment or coping? Guidelines don't yet recommend drugs that target neurosteroids directly. A doctor might offer these options instead: | Option | What it does | Link to neurosteroids | | --- | --- | --- | | SSRIs | Ease mood symptoms, sometimes taken only in the luteal phase | May also affect allopregnanolone levels, though that link isn't well mapped yet | | Certain hormonal contraceptives | Flatten the hormone swings that drive allopregnanolone's rise and fall | Reduce the signal the GABA-A receptor reacts to | | CBT | Builds skills for the thoughts and reactions around the days before your period | Doesn't change neurosteroid levels directly | **A doctor decides** what fits your history and symptoms. Two things this can mean for you tonight: - If a wave of anxiety or anger eases within a few days of your period starting, hormones are likely part of it. - If it's steady all month, or getting worse, bring it up with a doctor rather than waiting it out. If you want to see whether a wave of anxiety or anger lines up with your luteal phase, Niyora is a PMS and PMDD support app. Its estimated PMS window can help you spot the pattern, and if it tips into a fight with someone, its Moon feature lets you write down what happened, see it from another angle and draft a reply you can hold for 20 minutes. Read more on [what causes PMDD](https://niyora.com/questions/what-causes-pmdd/). If this takes a week of every month, or you have thoughts of hurting yourself, see a GP or gynecologist and bring two months of daily notes. From the research library ## Research on neurosteroids 167 studies in the library look at neurosteroids in PMS and PMDD. They were published from 1994 to 2026, and each one has a short summary of what was tested and found. 167 studies, 1994 to 2026 How strong the studies are Strong study design 11 Moderate study design 45 Early or limited evidence 111 - [Review, 2026How well do SSRIs treat PMS?SSRIs like sertraline and fluoxetine are first-line treatments for severe PMS. They work at low doses, are safe with few side effects, and reduce symptoms by affecting serotonin and brain chemistry related to mood.Strong study design](https://niyora.com/research/papers/a-review-of-recent-reports-on-the-role-of-ssri-use-in-understanding-the-2026/) - [Systematic review, 2026Why do some women experience mood changes linked to their menstrual cycle?Evidence shows these women have normal hormone levels but heightened sensitivity in their brains and cells to hormone changes. This explains PMDD and some postpartum and perimenopausal mood problems, and has led to new treatments.Strong study design](https://niyora.com/research/papers/not-broken-just-sensitive-a-systematic-review-of-hormones-mood-and-the-female-2026/) - [Case-control study, 2024Do steroid hormone levels change differently across the menstrual cycle in women with PMDD?Yes. Progesterone rises earlier in the cycle in women with PMDD, leading to higher levels around ovulation and a sharper drop in the late luteal phase. This different pattern may trigger symptoms.Strong study design](https://niyora.com/research/papers/neuroactive-steroid-hormone-trajectories-across-the-menstrual-cycle-in-2024/) - [Systematic review, 2022Does the stress hormone cortisol change across the menstrual cycle?Yes, but only slightly. Across many studies, cortisol was a little higher in the first half of the cycle (follicular phase) than the second half (luteal phase), and higher during a period than right before it, but most other phase comparisons showed no clear difference.Strong study design](https://niyora.com/research/papers/hpa-axis-activity-across-the-menstrual-cycle-a-systematic-review-and-meta-2022/) - [Systematic review, 2022Is taking antidepressants only at certain times as effective as taking them every day for PMS?Yes. Intermittent dosing works just as well as taking them every day, with effects starting within hours and peaking within 2 days.Strong study design](https://niyora.com/research/papers/intermittent-selective-serotonin-reuptake-inhibitors-for-premenstrual-syndromes-2022/) - [Survey study, 2022What causes PMS and PMDD and what new treatments are being studied?PMS and PMDD involve changes in hormone sensitivity, serotonin levels, genetic factors, and inflammation. New treatments under research target progesterone receptors and inflammatory pathways.Strong study design](https://niyora.com/research/papers/recent-advances-in-understanding-management-of-premenstrual-dysphoric-disorder-2022/) ### Clinical trials - [Allopregnanolone and Dynamic GABA-A Receptor Plasticity in Selective Serotonin Reuptake Inhibitor Responsive Premenstrual Dysphoric DisorderRecruiting now, United States](https://niyora.com/research/trials/allopregnanolone-and-dynamic-gaba-a-receptor-plasticity-in-nct06704594/) - [A Study of Efficacy and Safety of Sepranolone (UC1010) in Patients With Premenstrual Dysphoric Disorder (PMDD)Completed, Germany](https://niyora.com/research/trials/a-study-of-efficacy-and-safety-of-sepranolone-uc1010-in-nct03697265/) - [Stress & Premenstrual Symptoms StudyCompleted, United States](https://niyora.com/research/trials/stress-premenstrual-symptoms-study-nct02777372/) [See all 167 studies on neurosteroids (allopregnanolone)](https://niyora.com/research/topics/treatment-neurosteroids/) ## Questions people ask What exactly is a neurosteroid? + A neurosteroid is a hormone-like molecule the brain makes, often from steroid hormones like progesterone, that acts directly on nerve cells. Neurosteroids work fast, changing receptor activity within minutes rather than hours, which is why hormone swings can shift mood quickly in the days before a period. Is allopregnanolone the same thing as a neurosteroid? + Allopregnanolone is one specific neurosteroid, made from progesterone, and the one most studied in PMS and PMDD. Neurosteroids as a group include other molecules too, but allopregnanolone's effect on the GABA-A receptor is the clearest link researchers have found to premenstrual mood changes. Do neurosteroids cause PMDD? + Neurosteroids don't cause PMDD on their own. PMDD seems to involve a different brain reaction to the normal rise and fall of allopregnanolone during the luteal phase, not abnormal amounts of the hormone itself. Genetics, stress and other factors likely shape why some brains react this way and others don't. Can changing allopregnanolone levels treat PMDD? + Drugs that change allopregnanolone levels, like dutasteride and sepranolone, have reduced PMDD symptoms in some trials, though results have been mixed and none are approved treatments yet. Current guidelines still rely on SSRIs, some hormonal contraceptives and CBT, with a doctor deciding what fits your situation. ## Sources - 1. [Sex Hormones, Neurosteroids, and Glutamatergic Neurotransmission: A Review of the Literature](https://doi.org/10.1159/000531148), Neuroendocrinology, 2023 - 2. [Variation in genes and hormones of the hypothalamic-pituitary-ovarian axis in female mood disorders - A systematic review and meta-analysis](https://doi.org/10.1016/j.yfrne.2021.100929), Frontiers in neuroendocrinology, 2021 - 3. [5α-Reductase Inhibition Prevents the Luteal Phase Increase in Plasma Allopregnanolone Levels and Mitigates Symptoms in Women with Premenstrual Dysphoric Disorder](https://doi.org/10.1038/npp.2015.246), Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 2016 - 4. [Treatment of premenstrual dysphoric disorder with the GABA A receptor modulating steroid antagonist Sepranolone (UC1010)-A randomized controlled trial](https://doi.org/10.1016/j.psyneuen.2017.02.031), Psychoneuroendocrinology, 2017 - 5. [Effects of GABA active steroids in the female brain with a focus on the premenstrual dysphoric disorder](https://doi.org/10.1111/jne.12553), Journal of neuroendocrinology, 2018 - 6. [A randomized, double-blind study on efficacy and safety of sepranolone in premenstrual dysphoric disorder](https://doi.org/10.1016/j.psyneuen.2021.105426), Psychoneuroendocrinology, 2021 - 7. [Brain reactivity during aggressive response in women with premenstrual dysphoric disorder treated with a selective progesterone receptor modulator](https://doi.org/10.1038/s41386-021-01010-9), Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology, 2021 - 8. [The steroid metabolome in women with premenstrual dysphoric disorder during GnRH agonist-induced ovarian suppression: effects of estradiol and progesterone addback](https://doi.org/10.1038/tp.2017.146), Translational psychiatry, 2017 Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗ On this page - [What are neurosteroids?](#what-are-neurosteroids) - [How do neurosteroids relate to PMS and PMDD?](#how-do-neurosteroids-relate-to-pms-and-pmdd) - [What does the research say?](#what-does-the-research-say) - [Why does it matter for treatment or coping?](#why-does-it-matter-for-treatment-or-coping) - [Research](#research) - [Questions](#faq) Niyora PMS & PMDD support For the hard moment before your period. Private, no account. [Get it on iPhone](https://apps.apple.com/app/niyora-pms-emotions/id6764561688) ## Keep reading Condition PMDD (premenstrual dysphoric disorder), explained Condition The luteal phase: what's happening in your body and mood Question What causes PMDD? Cycle guide Menstrual cycle hormones, phase by phase Guide All 26 research findings Term Corpus luteum: what it means Term What Does PMS Mean in Text and Slang? Term Allopregnanolone: what it means for PMDD