The Mushroom That Eats Your Old Antidepressants — ShroomWire

The Mushroom That Eats Your Old Antidepressants

ByRowan Hale
⏱ 10 min read🗓 Reviewed Jun 15, 2026🔬 AI-researched · Reviewed by Nathan Peters · How we grade the evidence

Right now, on a field somewhere in America, a tanker is spreading treated sewage sludge across soil that will grow next season’s corn. It’s legal, it’s routine, and it’s even good for the dirt — the stuff is rich in nitrogen and phosphorus. There’s just one wrinkle nobody put on the label: riding along in that sludge are trace amounts of the antidepressants the people upstream flushed, swallowed, or poured down the drain. And the drugs don’t break on their way through the treatment plant. They arrive intact.

A pair of researchers at Johns Hopkins wanted to know if a mushroom could fix that. So they took the sludge, spiked it with nine psychiatric drugs, and let fungi loose on it. Two months later, most of the drugs were gone — and the way they vanished is the genuinely surprising part.

Mushroom Eats Old Antidepressants
Original art — ShroomWire

What lands on the farm field

The unglamorous name is biosolids — the nutrient-rich solid left over after a wastewater plant finishes cleaning sewage. The United States produces roughly four million tons of it a year, and about 60% gets spread on farmland as fertilizer. On paper that’s recycling at its best: instead of landfilling or incinerating sewage, you return its nitrogen and phosphorus to the soil. The problem is that conventional treatment was engineered to handle bacteria and bulk organic matter, not the chemically stubborn molecules in modern medicine.

So a fraction of every prescription that passes through a human body — plus every unused pill someone rinses down the sink — survives the plant and concentrates in the solids. Antidepressants are a particularly sticky case. They’re designed to be stable enough to survive your digestive tract and reach your brain intact, which is exactly the property that lets them outlast a wastewater plant too. Lead author Kate Burgener, a PhD student in Johns Hopkins’ Department of Environmental Health and Engineering, put the stakes plainly: even small concentrations of these compounds can have psychological effects when consumed, which is why they’ve become what regulators call “contaminants of concern.”

Once they’re in the soil, the question becomes where they go next — leaching toward groundwater, lingering in the dirt, or being pulled up into the roots and leaves of food crops. That last pathway is what worries scientists most, and it’s why a cheap way to break these molecules before the sludge ever reaches a field would be worth a great deal.

The experiment: fungi versus sludge

Here’s where it gets strange. Burgener and her co-author, associate professor Carsten Prasse, didn’t reach for an exotic, lab-engineered organism. They reached for two mushrooms you can buy at a grocery store or a garden center: the oyster mushroom (Pleurotus ostreatus) and turkey tail (Trametes versicolor). Both are “white-rot” fungi — the workhorse decomposers that turn fallen logs back into forest floor. Both are among the most-studied and most widely available fungi on Earth, which is part of the appeal: a remediation method built on a mushroom anyone can grow is a method that can actually scale.

They spiked real municipal biosolids with nine psychoactive pharmaceuticals — among them the antidepressants citalopram, trazodone, and desvenlafaxine, and the mood stabilizer lamotrigine — and then grew the fungi directly on the contaminated sludge for up to 60 days.

That last detail matters more than it sounds, and it’s the methodological heart of the study. Plenty of earlier work has shown fungi degrading drugs in a clean flask of liquid nutrients — a tidy, well-fed, competition-free environment. Real biosolids are none of those things. They’re a crowded, messy, living matrix already teeming with native bacteria. As Burgener pointed out, watching a compound disappear in liquid culture doesn’t necessarily tell you what happens when you make the fungus actually live in a polluted environment. So the team ran it both ways — in liquid media and on the biosolids themselves — and tracked every molecule with high-resolution mass spectrometry, which can pinpoint a compound’s concentration and catch the new chemicals forming as it breaks down.

What the mushrooms managed

After two months, the numbers were hard to argue with. Each fungus knocked out eight of the nine drugs, with removal efficiencies ranging from 48% to nearly 99%.

The oyster mushroom was the standout. It nearly erased desvenlafaxine, trazodone, and citalopram — clearing more than 90% of each. Turkey tail wasn’t far behind, taking down more than 75% of desvenlafaxine, trazodone, and lamotrigine. Neither species was a perfect janitor — one compound resisted each of them — but for a couple of common mushrooms growing on sewage, “removed most of the antidepressants” is a remarkable line in a results table. And because the two species didn’t fail on the same compound, it hints that a blend of fungi might one day cover more ground than either alone.

The part that actually matters: gone, not just hidden

If the fungi were merely soaking up the drugs and locking them inside their tissue, this would be a much smaller story. That’s called sequestration, and it doesn’t really solve anything — it just moves the contaminant from the sludge into a mushroom you now have to dispose of. The drug is still a drug; you’ve only changed its address.

That’s not what happened. When the team analyzed the chemistry, they found the fungi were taking the molecules apart. The drugs weren’t trapped — they were dismantled into more than 40 different byproducts, the molecular signatures of compounds being cleaved and oxygenated: chopped up and chemically rearranged into something new. This is the difference between sweeping dirt under a rug and actually breaking it down, and it’s the finding that elevates the paper from “neat trick” to “potential treatment.”

Then came the obvious next question — were the leftovers any safer than the originals, or had the fungi just traded one problem for forty smaller ones? To get a first read, the researchers ran the byproducts through the EPA’s Cheminformatics hazard-assessment module, a computational tool that predicts toxicity from chemical structure. The model’s verdict: most of the transformation products would likely be less toxic than the parent drugs. The fungi, in other words, don’t appear to be relocating the problem so much as defusing it.

Why a log-rotting fungus can dismantle a pill

Step back and the strangeness sharpens. Why would a mushroom evolved to rot oak have any interest in an antidepressant it never encountered in nature?

The answer is almost poetic. White-rot fungi earn their living by eating lignin — the rugged, irregular polymer that makes wood woody and that almost nothing else on the planet can fully digest. Lignin is nature’s reinforced concrete, and breaking it is brutally hard chemistry. To pull it off, these fungi secrete a toolkit of powerful, deliberately indiscriminate enzymes — lignin peroxidases, manganese peroxidases, and laccases — that throw off reactive, oxygen-based attacks on tough chemical bonds. Crucially, this machinery isn’t a precision key cut for one lock. It’s closer to a wrecking ball. It evolved to shred a chaotic natural polymer, so it works on a startling range of structures it was never “designed” for.

A pharmaceutical molecule, for all the ingenuity that went into designing it, is just another tough organic structure with rings and bonds to attack. The enzymes don’t know the difference between a splinter of oak and a molecule of citalopram. They simply oxidize what’s in front of them. A drug engineered to survive the human liver — to resist being broken down — turns out to be no match for the same chemistry that rots a fallen tree.

This is also why the result, while striking, isn’t coming out of nowhere. The broader field has a name — mycoremediation — and white-rot fungi have been studied for decades as cleanup agents for industrial dyes, petroleum residues, pesticides, and other pollutants that resist conventional breakdown, precisely because of those promiscuous ligninolytic enzymes. What the Johns Hopkins work adds is a tightly relevant, real-matrix test: not a dye in a beaker, but the actual psychiatric drugs in the actual sludge that actually gets spread on farmland.

From petri dish to farm field

So should we expect mushroom-treated biosolids at the local co-op next year? Not even close — and the researchers are the first to say so.

A controlled experiment, spiked with drugs at known concentrations and run over 60 days, is a proof of concept, not a deployment plan. The leap to four million tons a year is an engineering problem of a completely different size. The native microbial community already living in biosolids would compete with any introduced fungus for space and food, and nobody yet knows how that tug-of-war resolves at scale, in open conditions, across seasons and soil types. Get the balance wrong and the fungi might never establish; get it right and you’d still need a practical, affordable way to inoculate enormous volumes of sludge.

There’s a reason the team insisted on growing the fungi on real biosolids rather than just in liquid: the gap between those two settings is exactly where promising remediation ideas tend to die. Showing that the effect survives contact with the messy real world is what makes this version more credible than a flask result — and also what reveals how much engineering still stands between a lab finding and a working treatment step. The honest framing is that this opens a door, not that it walks through it.

Frequently asked questions

Are these “magic mushrooms”?
No — and the paper’s title (“Magic Mushrooms?”) is a deliberate wink. The species studied are the oyster mushroom and turkey tail, culinary and medicinal fungi with no psilocybin. The “psychoactive” part refers to the drugs being broken down, not the mushrooms doing the breaking.

Does this mean biosolids are safe now, or that my food is contaminated?
Neither conclusion is warranted from this study. It was a controlled lab experiment over 60 days showing fungi can degrade these drugs in spiked sludge. It doesn’t measure what’s in any real crop, and it doesn’t certify any biosolids as clean. It points to a possible future cleanup method, not a verdict on today’s food.

Can eating oyster mushrooms “detox” drugs from my body?
No. This is environmental cleanup of sewage sludge, and it works through enzymes the fungus secretes onto the material it grows on — over weeks, outside any living animal. It says nothing about human digestion or health, and nothing here is medical advice.

Why are antidepressants in sewage sludge in the first place?
Drugs leave the body in waste and also get flushed when unused. Standard wastewater treatment doesn’t fully break down these complex, deliberately stable molecules, so they concentrate in the leftover solids — the biosolids — which are then widely applied as farm fertilizer.

What’s special about white-rot fungi specifically?
They’ve evolved to digest lignin, the toughest polymer in wood, using powerful and non-specific enzymes (peroxidases and laccases). Those same enzymes attack a wide range of pollutants they never evolved to handle — which is why white-rot fungi have been mycoremediation candidates for dyes, fuels, and pesticides for years.

Is this peer-reviewed?
Yes. It was published March 18, 2026 in ACS Environmental Au, a peer-reviewed open-access journal, by researchers at Johns Hopkins University.

Sources

Educational Disclaimer

This article is for informational and educational purposes only. It is not
medical advice, mental health advice, diagnosis, treatment guidance, or a
recommendation to use any substance, supplement, therapy, or protocol.

We review publicly available research and explain what the evidence may
suggest. Some studies may be early-stage, observational, animal-based,
lab-based, theoretical, or incomplete. Always consult a qualified
professional before making health-related decisions.

Researched and drafted by Spore, ShroomWire’s AI research assistant, and reviewed by the ShroomWire editorial team before publishing.

Frequently asked questions

Do antidepressants in sewage sludge end up in food crops?
The article notes that uptake into roots and leaves of food crops is what worries scientists most, though it doesn't confirm this happens. The concern is that psychiatric drugs survive wastewater treatment and concentrate in biosolids applied to farmland, with potential pathways toward groundwater or plant uptake.
Can oyster mushrooms actually break down antidepressants, or do they just absorb them?
The fungi dismantled the drugs rather than merely trapping them. The study found the mushrooms chemically broke the compounds into more than 40 different byproducts through enzymatic action, rather than sequestering them intact in their tissue.
Are the breakdown products from mushroom-treated sludge safer than the original drugs?
An EPA computational tool suggested most transformation products would likely be less toxic than the parent drugs, though this was a hazard-prediction model rather than direct toxicity testing. The fungi appear to defuse the compounds rather than relocate them.
Why would a mushroom that rots wood be able to break down psychiatric medications?
White-rot fungi evolved powerful, indiscriminate enzymes to digest lignin — the tough polymer in wood. These same enzymes can attack other complex, stable molecules including antidepressants, which were designed to survive harsh conditions.
Is spreading sewage sludge on farmland actually safe?
The article describes it as legal and routine, valued for returning nitrogen and phosphorus to soil, but notes conventional treatment wasn't designed to remove modern pharmaceuticals. Regulators now consider these drug traces 'contaminants of concern,' though the article doesn't evaluate overall biosolid safety.

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