Hormones and Depression: Why Antidepressants Often Aren't the Answer

By Dr. Farhan Abdullah, DO | Medical Director, Magnolia Functional Wellness | Southlake, TX

She'd been on Zoloft for nine months. Then Wellbutrin got added on top. By the time she walked into my Southlake office, she was on a third medication and still couldn't get out of bed before 10 a.m. without crying. Her psychiatrist kept telling her she had "treatment-resistant depression." What nobody had checked was her hormones.

Her FSH was 42. Her estradiol was in the basement. She wasn't treatment-resistant. She was in perimenopause, and her brain had been steadily losing the estrogen it was used to having for the better part of three decades. After about ten weeks on transdermal estradiol and oral micronized progesterone, she texted me a photo of herself running a 5K at Bicentennial Park. The antidepressants? Tapered off, with her psychiatrist's blessing.

I'm Dr. Farhan Abdullah, an internal medicine and functional medicine physician, and I run women's hormone replacement therapy at Magnolia Functional Wellness in Southlake. May is Mental Health Awareness Month, and every year I see a flood of women whose "depression" turns out to be something else entirely. Not all of them. But enough that I think we owe the conversation a more honest look.

The Story We've Been Telling Women is Incomplete

For roughly forty years, the dominant story in psychiatry has been the serotonin hypothesis. Low mood means low serotonin. Low serotonin means SSRIs. Prozac, Zoloft, Lexapro, Cymbalta, on and on. And to be fair, these medications help millions of people. I'm not anti-antidepressant. I prescribe them in the hospital when patients need them.

The problem isn't that SSRIs exist. The problem is that they've become the reflex answer to every form of female sadness, fatigue, irritability, brain fog, or anhedonia, regardless of context. A 38-year-old who's been wired and weepy since her last pregnancy gets the same workup as a 49-year-old who can't sleep through the night anymore. Both walk out with a prescription pad's version of "let's see if this helps."

Here's what's missing from that story: hormones don't just live in your reproductive organs. Estrogen receptors are dense in the prefrontal cortex, the hippocampus, and the amygdala. These are the brain regions that handle mood regulation, memory, and emotional processing. When estrogen swings wildly, as it does during perimenopause, postpartum, or even across a cycle in some women, the systems built around it start to misfire. You can pour all the SSRIs you want into a brain that's missing its hormonal scaffolding. Sometimes it works. Often, it doesn't.

A 2015 review by Newhouse and Albert in JAMA Psychiatry laid out the neurocognitive model pretty cleanly: estrogen modulates serotonergic, dopaminergic, and HPA axis function. When estrogen drops, the brain's stress response system gets dysregulated. Mood follows. So when a woman tells me her antidepressant "stopped working" around age 45, the right question isn't always "let's increase the dose." Sometimes it's "let's check your FSH."

Perimenopause: The Decade Nobody Warned You About

Perimenopause can start as early as your late 30s and routinely lasts seven to ten years. During that stretch, estrogen doesn't gracefully decline. It crashes, rebounds, crashes again. The hormonal volatility, not the eventual deficiency, is what wrecks mood for so many women.

What does that look like in real life? A patient of mine who's a mom of three teenagers in Southlake described it perfectly. "I went from being the calm one in the house to being the one everyone tiptoes around. I scream at my kids over nothing. I cry in the Tom Thumb parking lot. I don't recognize myself." She'd been started on Lexapro by her PCP. Six months in, she felt flat instead of furious, but no better. We checked her labs. Estradiol was 14 pg/mL on day 21 of her cycle. Progesterone was 0.4 ng/mL.

This is where the landmark Gordon trial comes in. In 2018, Jennifer Gordon and colleagues published a randomized controlled trial in JAMA Psychiatry testing whether transdermal estradiol plus intermittent micronized progesterone could prevent depressive symptoms in perimenopausal and early postmenopausal women. Over 12 months, the women on hormone therapy were significantly less likely to develop clinically significant depressive symptoms compared to placebo. This wasn't a fringe study. It was rigorous, placebo-controlled, and published in one of the most respected psychiatry journals in the world.

And yet, in clinical practice, how often does the average woman in her late 40s actually get offered hormone therapy as a first-line option for new-onset mood symptoms? Almost never. She gets an SSRI prescription and a referral to a therapist. Both can be useful. Neither addresses the underlying biology.

The Other Hormones Nobody's Checking

Estrogen gets most of the attention, but it's not the only hormone that influences mood. In my practice, when a woman comes in with depressive symptoms that aren't fully responding to standard care, I'm running a much wider panel than what most primary care offices order.

Progesterone. This one is wildly underappreciated. Natural progesterone is metabolized into allopregnanolone, which acts on GABA receptors in the brain. GABA is your calm-down neurotransmitter. When progesterone drops in the luteal phase or in perimenopause, GABA tone falls. Anxiety rises. Sleep fragments. The link between low progesterone and PMDD-like symptoms is one of the most consistent findings in reproductive psychiatry.

Thyroid. Subclinical hypothyroidism mimics depression so well that it's almost embarrassing how often it gets missed. Fatigue, weight gain, low motivation, slowed thinking, low libido. I've seen women on three psychiatric medications whose TSH had drifted into the high 4s or low 5s and nobody had touched it. A free T3 in the lower third of the reference range, even with a "normal" TSH, can absolutely be driving a depressive picture in a vulnerable patient.

Testosterone. Yes, women have testosterone too, and yes, it matters for mood, motivation, and the capacity for pleasure. By age 40, a woman's testosterone is often half what it was at 25. By menopause, it's a quarter. The link to depressive symptoms isn't as well-studied in women as it is in men, but the meta-analysis by Walther and colleagues in JAMA Psychiatry showed clear antidepressant effects of testosterone treatment in men. The female literature is catching up. Anecdotally, I can tell you that women whose total testosterone we restore from 12 ng/dL to 50 or 60 ng/dL routinely describe a return of "wanting to do things again." Anhedonia is a hormone problem more often than we admit.

Cortisol and DHEA. Chronic stress flattens the cortisol curve and tanks DHEA. Women with this pattern feel exhausted but wired, can't wind down at night, and wake up at 3 a.m. like clockwork. SSRIs don't fix this either.

Postpartum: Where the Hormonal Cliff is the Steepest

Postpartum depression is finally getting recognized for what it really is, which is a neuroendocrine event, not just a psychological one. In the 48 hours after delivery, estrogen drops by roughly 90 percent. Progesterone collapses with it. Thyroid antibodies surge in some women. Brain levels of allopregnanolone bottom out.

The 2023 FDA approval of zuranolone, an oral allopregnanolone analog specifically for postpartum depression, was a quiet acknowledgment of something functional medicine docs have been saying for years: this is a hormone-driven mood disorder, and treating it like generic depression with a generic SSRI underserves the women going through it. I'm not saying SSRIs have no role postpartum. They do. But hormone-aware care should be the floor, not the ceiling.

If you've had a baby in the last twelve months and you're not feeling like yourself, get your thyroid checked. Postpartum thyroiditis is common, transient, and routinely missed. A free T4 and TPO antibody panel costs almost nothing and can reframe everything.

When SSRIs Are Still the Right Call

I want to be careful here. There are women whose depression is genuinely a primary mood disorder, who have a strong family history, who developed symptoms in their 20s before any hormonal event, and who do beautifully on antidepressants. There are also women whose perimenopausal mood symptoms are severe enough that hormones alone won't get them where they need to be, and an SSRI bridges the gap.

What I'm pushing back against isn't the medication itself. It's the order of operations. The current default is: SSRI first, hormones maybe never. The order I argue for, especially in women between 35 and 55, is: hormonal workup first, then decide. Sometimes the answer is hormones. Sometimes it's both. Sometimes it's hormones first, then we revisit whether the SSRI is still earning its keep.

This is also where therapy belongs in the conversation. Cognitive behavioral therapy, EMDR for women with trauma histories, and good old-fashioned support work alongside any biological intervention. Hormones aren't a magic bullet. They're a foundation that lets the rest of the work actually take.

What an Honest Workup Looks Like

If you're in DFW and you've been on antidepressants for a while without feeling like yourself, here's what a thorough hormone-aware evaluation should include. None of this is exotic. Most of it should be standard for any woman over 35 with mood symptoms, and frankly, isn't.

A complete hormone panel timed to your cycle if you're still cycling: estradiol, progesterone, total and free testosterone, DHEA-S, FSH, LH, SHBG. A full thyroid panel: TSH, free T3, free T4, reverse T3, and TPO and TG antibodies. A morning cortisol with consideration of a four-point salivary cortisol if symptoms suggest HPA dysregulation. Vitamin D, B12, ferritin, and a homocysteine. An MTHFR variant if there's a history of postpartum depression or treatment resistance, because it changes how you methylate folate, and methylated B vitamins can make a striking difference in some patients.

This isn't a fishing expedition. Each one of those markers has a documented relationship to mood. Skipping them and going straight to medication is like trying to fix a car without ever opening the hood.

The Bigger Point

Mental Health Awareness Month tends to be heavy on slogans and light on systems thinking. Reach out, ask for help, you're not alone. All true. All important. But for the millions of women whose mood symptoms have a treatable hormonal driver hiding underneath, awareness without proper workup is its own kind of failure.

If you're in Southlake, Westlake, Grapevine, or anywhere in the DFW area and you've been told your depression is "just stress" or "just hormones, nothing we can do" or, worse, that you need a third medication added on top of two that aren't working, you deserve a more curious physician. That's the kind of medicine we practice at Magnolia Functional Wellness, and it's the kind every woman in her 40s should have access to. Your brain is talking to you. Your hormones are part of that conversation. It's worth listening before you decide what to do about it.