Why we have written this. This is for women with ADHD who have noticed that their medication seems to fade in the week before a period, that their emotions get harder to manage at the same time, or that something similar happened after a baby, with a new contraceptive or in perimenopause. It explains the one hormone that sits behind most of those experiences, progesterone, and the calming substance the body makes from it, allopregnanolone. It is a companion to our complete guide to hormones, ADHD and women's mental health, and it is general information rather than personal medical advice. Please discuss any change to your medication or contraception with your own doctor.
Many women with ADHD tell us the same story. Their medication works well for most of the month, then seems to stop working in the week before their period. Their emotions feel harder to manage at the same time. Some notice the same thing after having a baby, when they start a new contraceptive, or in perimenopause.
This is not imagined. It reflects how sex hormones act on the brain chemicals that ADHD and mood depend on, and progesterone is the one that explains most of it.
The brain chemistry in plain terms
Three brain chemical systems respond to sex hormones, and each matters for ADHD and mood.
- Brain system: Dopamine; What it does: Focus, motivation, reward, working memory. ADHD stimulants work mainly here; How hormones affect it: Oestrogen boosts it. Progesterone dampens it
- Brain system: Serotonin; What it does: Mood stability, irritability, anxiety, sleep and appetite; How hormones affect it: Oestrogen supports it. Levels drop when oestrogen falls
- Brain system: GABA; What it does: The brain's main calming, braking system; How hormones affect it: Allopregnanolone, made from progesterone, strengthens it. A sudden drop leaves the brain under-braked
Allopregnanolone is the key player most people have never heard of. It is a natural calming substance the body makes from progesterone, and it acts on the same receptors as some sedative medicines. The most important principle in this whole subject is that the brain reacts to change more than to level. Most symptoms appear when hormones are falling, not when they are high or low.
The good side of progesterone
For most women, progesterone is calming. Through allopregnanolone it eases anxiety and helps sleep, which is why body-identical progesterone in HRT is usually taken at bedtime.
Its dampening effect on dopamine reward is strong enough that researchers have tested progesterone as a treatment for stimulant addiction. In a randomised trial of 50 women who had recently given birth and had a cocaine use disorder, oral progesterone reduced cocaine use compared with placebo over twelve weeks, although the benefit faded at follow-up. Trials in men on methadone, and in women outside the postpartum period, did not show the same benefit, and a 2026 pilot in postpartum women using methamphetamine found progesterone safe but no difference in return to use. It is not an approved addiction treatment. The research matters here for a different reason: it confirms, in humans, how strongly progesterone blunts the brain's response to stimulants.
The difficult side
Some women are hormone-sensitive. In them, allopregnanolone has the opposite effect: it causes irritability, tension and anxiety instead of calm. This sensitivity underlies premenstrual dysphoric disorder (PMDD), and PMDD appears to be considerably more common in women with ADHD; a Dutch clinic study found PMDD-type symptoms in around 45% of women with ADHD, although clinic samples tend to overestimate.
Progesterone also weakens stimulant medication. In a laboratory study at the University of Chicago, women given the same dose of amphetamine in each half of the cycle felt its effects less strongly in the luteal phase, when progesterone is high, than in the follicular phase, and in the follicular phase the response rose with oestrogen. The tablet is the same and the blood levels are the same. The brain simply responds less.
The menstrual cycle: two different luteal phases
The second half of the cycle, the luteal phase, contains two quite different hormonal states, and they feel different.
- Hormones; Mid-luteal (about days 19 to 24): Progesterone at its peak, oestrogen moderate; Late luteal (about days 25 to 28): Both oestrogen and progesterone falling
- GABA; Mid-luteal (about days 19 to 24): Strengthened: drowsy, or irritable if sensitive; Late luteal (about days 25 to 28): Withdrawal: anxious, tense, poor sleep
- Dopamine; Mid-luteal (about days 19 to 24): Dampened by progesterone; Late luteal (about days 25 to 28): Lower as oestrogen falls
- Serotonin; Mid-luteal (about days 19 to 24): Fairly stable; Late luteal (about days 25 to 28): Lower as oestrogen falls
- How it feels; Mid-luteal (about days 19 to 24): Tired, sluggish, foggy; medication feels weaker; Late luteal (about days 25 to 28): Irritable, tearful, low, unfocused, quick to feel rejected
For many women with ADHD, the worst days continue into the first two or three days of the period, while oestrogen is still low. Tracking symptoms against period dates for two cycles usually makes this pattern visible, and it is the first thing we ask for.
After birth: the biggest hormonal drop of all
In pregnancy, progesterone and allopregnanolone reach levels many times higher than in any menstrual cycle. Within days of delivery, both fall to almost nothing, and oestrogen falls with them. This is the steepest withdrawal a woman's brain will experience.
Women with ADHD appear particularly vulnerable at this time. The same Dutch study reported postpartum depression in more than half of the women with ADHD who had given birth. Emotional dysregulation, sudden anger, overwhelm and rejection sensitivity can all intensify, just as sleep collapses and the demands on executive function peak.
If you have ADHD and are planning a pregnancy, make a postpartum plan with your psychiatrist in advance: medication, breastfeeding, sleep protection and early warning signs. Brexanolone and zuranolone, newer medicines that act like allopregnanolone, are licensed in some countries for postpartum depression, which supports the idea that the hormone drop itself drives symptoms.
Progestogens in contraception and HRT
With progestogen-only contraception, what matters most is what the method does to your own oestrogen. The hormonal coil leaves most women cycling and usually has little effect on mood or medication; the desogestrel or drospirenone pill and the implant stop ovulation and hold oestrogen at a moderate level, which smooths the swings; the injection suppresses oestrogen to low levels and is the method most likely to lower mood and dull medication. The complete guide sets this out in a table.
In HRT, a progestogen is added to protect the womb lining. Some women feel low, irritable or foggy on the progestogen days, which recreates a premenstrual week. Options include using a hormonal coil as the progestogen, switching to a continuous regimen, or taking body-identical progesterone at night. A Danish national study linked starting hormonal contraception with a modest rise in depression, highest in teenagers; most women are not affected, but if you have a history of hormone-related low mood it is worth tracking your mood for three months after any change.
Stimulant medicines such as lisdexamfetamine and methylphenidate do not reduce contraceptive effectiveness. Modafinil does.
What helps
Track before you change anything. Rate your focus, mood and irritability daily for two cycles, alongside your period dates. This shows whether the problem is ADHD symptoms worsening, PMDD, or both, and they are treated differently.
Adjust stimulant timing, with your prescriber. If focus and motivation dip predictably before your period, some clinicians agree a small, planned dose increase for those days. The evidence comes from small studies, so this is a prescriber's decision, never something to do on your own.
Consider a short-term SSRI for emotional symptoms. When irritability, rage, tearfulness or anxiety dominate, an SSRI such as sertraline or fluoxetine often works within days in PMDD, much faster than in depression, so it can be taken only in the second half of the cycle. Ovulation suppression is an option for severe cases.
A note on serotonin syndrome. Combining an SSRI with an ADHD stimulant is common and usually safe, but it needs care. Amphetamine releases some serotonin, so adding an SSRI slightly raises the risk of serotonin syndrome, a rare but potentially serious reaction, and fluoxetine and paroxetine also raise blood levels of amphetamine and atomoxetine. Watch for agitation, sweating, shivering, a racing heart, muscle twitching, diarrhoea or a high temperature, usually within hours of starting or increasing a dose. Mild symptoms need a call to your prescriber; a high fever, confusion or muscle stiffness needs urgent help. The risk rises with tramadol, triptans, St John's wort or MDMA. Never start an SSRI alongside ADHD medication without medical advice.
So, friend or foe?
Both. Progesterone calms most brains, unsettles sensitive ones, and dulls stimulant medication. Its fall, before a period, after birth or in perimenopause, is when emotional dysregulation and ADHD symptoms are most likely to flare. Recognising the pattern is the first step, because it is predictable and treatable.
Seek help if premenstrual or postpartum symptoms are affecting your relationships, work or safety, or if your ADHD medication seems to stop working for part of each month.
How we approach this at the Eton ADHD Clinic
Women's neurodiversity and the hormonal picture are a particular specialism of ours. We ask every woman we assess about her cycle, contraception, pregnancies and the menopause, we ask for two cycles of tracking before we change anything, and we plan ADHD treatment around PMDD, the postpartum period or perimenopause rather than in isolation. Integrated Consultant Gynaecology means HRT and contraception are part of the same conversation. We assess and treat adults across England and Wales, privately and under our contract with NHS Wales, and our children's and adolescents' service sees young people in London and in Manchester at Alderley Edge.
Six reasons women choose the Eton ADHD Clinic
- A women's neurodiversity specialism, with the hormonal picture built into every assessment.
- Gynaecology and psychiatry in one conversation, so contraception, HRT and ADHD treatment are planned together.
- Tracking before changing, so decisions rest on your own pattern.
- Planned stimulant adjustment and SSRI timing where they fit, under a prescriber's supervision.
- A postpartum plan made before the birth for women with ADHD planning a family.
- NHS and private care to the same standard, including our contract with NHS Wales.
Where to go next
Summary
Progesterone is neither good nor bad. It calms the brain for most women, unsettles it for some, and weakens how well ADHD stimulant medication works for almost everyone. Which of these you notice depends on your own sensitivity and, above all, on how fast your hormone levels are changing. Its fall, before a period, after birth and in perimenopause, is when ADHD symptoms and emotional dysregulation are most likely to flare.
Sources
- Dorani, F., Bijlenga, D., Beekman, A.T.F., van Someren, E.J.W. & Kooij, J.J.S. Prevalence of hormone-related mood disorder symptoms in women with ADHD. Journal of Psychiatric Research 133, 10–15 (2021). https://doi.org/10.1016/j.jpsychires.2020.12.005
- Jespersen, C., Lauritsen, M.P., Frokjaer, V.G. & Schroll, J.B. Selective serotonin reuptake inhibitors for premenstrual syndrome and premenstrual dysphoric disorder. Cochrane Database of Systematic Reviews 8, CD001396 (2024). https://doi.org/10.1002/14651858.CD001396.pub4
- Justice, A.J.H. & de Wit, H. Acute effects of d-amphetamine during the follicular and luteal phases of the menstrual cycle in women. Psychopharmacology 145(1), 67–75 (1999). https://doi.org/10.1007/s002130051033
- Oliva, A., Reed, S.C., Brooks, D.J. et al. Safety and tolerability of progesterone treatment for women with cocaine use disorder: a pilot randomized placebo-controlled trial. American Journal of Drug and Alcohol Abuse 48(5), 586–595 (2022). https://doi.org/10.1080/00952990.2022.2114004
- Skovlund, C.W., Mørch, L.S., Kessing, L.V. & Lidegaard, Ø. Association of hormonal contraception with depression. JAMA Psychiatry 73(11), 1154–1162 (2016). https://doi.org/10.1001/jamapsychiatry.2016.2387
- Smid, M.C., Charles, J.E., Allshouse, A.A. et al. Prevention of postpartum methamphetamine use with micronized progesterone trial (PROMPT): a pilot randomized controlled trial. Drug and Alcohol Dependence 287, 113325 (2026). https://doi.org/10.1016/j.drugalcdep.2026.113325
- Sofuoglu, M., Poling, J., Gonzalez, G. et al. Progesterone effects on cocaine use in male cocaine users maintained on methadone: a randomized, double-blind, pilot study. Experimental and Clinical Psychopharmacology 15(5), 453–460 (2007). https://doi.org/10.1037/1064-1297.15.5.453
- Yonkers, K.A., Forray, A., Nich, C. et al. Progesterone reduces cocaine use in postpartum women with a cocaine use disorder: a randomized, double-blind study. The Lancet Psychiatry 1(5), 360–367 (2014). https://doi.org/10.1016/S2215-0366(14)70333-5
Frequently Asked Questions
This article was written by Dr. Hossein Rostamipour for Eton Psychiatrists and first published at etonpsychiatrists.co.uk. © 2026 Eton Psychiatrists. All rights reserved.
