Associate Professor in Psychiatry (AdelaideU). Maudsley Deprescribing Guidelines: https://xitter.cf/t.co/MdD00qaw2z (US) https://xitter.cf/t.co/9eUVpPjCRX (UK)

London
Joined April 2013
I've written a blog in response to @awaisaftab's misleading blog about Kalfas: "No, the Kalfas Meta-Analysis Doesn’t Prove Antidepressant Withdrawal Is Modest: Nonsense Disguised as Nuance" bit.ly/4ofhd7S
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Mark Horowitz @markhoro.bsky.social retweeted
This would be funny if ketamine didn't have serious adverse effects. Ketamine has rapid effects because it makes you drunk/high and that temporarily overrides your underlying feelings (along with a strong placebo effect). There's nothing complicated about it.
Oxford research published last month found that ketamine reduces activity in a brain region involved in processing negative experiences. The Department of Psychiatry’s findings offer new clues about its rapid antidepressant effects. Find out more ⬇️ ox.ac.uk/news/2026-09-23-stu…
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Such vital work!
Day 2 at the Science Festival! The SafeMeds Hellas team continued engaging with the public, exploring how to read medication leaflets and report suspected adverse drug reactions through the Yellow Card system. Empowering safer medication use through knowledge! #SafeMedsHellas #ScienceFestival #MedicationSafety #Pharmacovigilance
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Martin Ploderl explains with crystal clarity that studies find that the effect of antidepressants in children and adolescents do not differ from placebo in effect on depression. Given their clear harms this means that guidelines should no longer recommend these drugs for treating depression in children. Guidelines however continue to do so on outdated studies. @NICEComms and others need to update guidance to prevent avoidable harm Link to Martin’s blog below.
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It is good to be reminded for the 100s of thousands of people trying to survive long-term psychiatric drug withdrawal injuries that there is hope for recovery, even if it takes years. What will it take for this extraordinary harm to be properly factored into the prescribing of these drugs in the first place?
I haven't been posting much on X this summer bc I've been so busy enjoying my life. Hard to believe after years of protracted withdrawal injuries from psychiatric drugs right?! It's so important to believe you will recover. Life can get so much better again. Have hope. Don't give up.
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It is important that @NICEComms reviews its guidelines based on this finding.
A single clinical trial of 40 children might have wrongly swayed medical evidence in favour of using Prozac to treat depression in children and adolescents, a group of researchers say. go.nature.com/3U4nY27
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It's always useful to hear anecdotes but it is important that we rely on good evidence when exposing children to medications that cause a wide variety of harms. The recent Cochrane review found that sertraline has "small and unimportant" effects on depression in children. It is not approved by the TGA for depression in children.
Replying to @markhoro
Personally I find this development validating. Having worked in adolescent MH @headspace_aus for 20 yrs I have never felt fluoxetine was very effective. More recent meds esp escitalopram & sertraline much more so (for a subset) & more effective for anxiety than depression per se
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This is certainly the most consequential paper published in child and adolescent psychiatry for the last few years. It shows that the meta-analyses that current child psychiatry guidelines rely on to recommend fluoxetine for depression were skewed by an unbelievable trial (n=40) in Iran which found an effect 15 times larger than the average. When this trial is removed all meta-analyses find the same as a recent Cochrane analysis which found 'small and unimportant differences.' The flawed meta-analyses by Zhou and @cipriani in the @TheLancet and Lancet Psychiatry need to be corrected. And guideline committees need to update their guidance in the context of the harms of these drugs including withdrawal effects, sexual effects and agitation/akathisia and suicidality in a minority of youths exposed to them. Link below
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Apologies to the good people at @Cipriani restaurant - no need to correct your no doubt excellent bolognaise. I meant Professor Cipriani @And_Cipriani
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“He said I shouldn’t have been taking Klonopin for so long, almost like I’d been writing my own prescriptions for the past nineteen years.” A powerful account of benzodiazepine withdrawal—and the harm compounded when doctors fail to recognise it. This is just another story which shows why safe tapering and believing patients matters. Link below
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Mark Horowitz @markhoro.bsky.social retweeted
How is this going to affect their emerging personalities, and what sort of adults will they become?
A girl put on an SSRI at eight has no before. She will move through her first crush, her first heartbreak, her first kiss, all of it dialed down a few notches, and she will never think to ask what's missing. Around one in ten girls as of 2019 were taking antidepressants, twice as the percentage of
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Mark Horowitz @markhoro.bsky.social retweeted
More worrying evidence of adverse pregnancy effects of SSRIs and reason to reign in prescribing, especially to young women
NEW STUDY: -Children with prenatal exposure to antidepressants (mostly SSRIs) had an increased risk of Autism, ADHD, & behavioral-emotional-social difficulties. These findings are consistent with antidepressant effects on fetal neurodevelopment. Both maternal depression and antidepressant exposure were associated with increased risk, but the increase was greater with antidepressants than with untreated depression. "Antidepressant exposure was associated with a 2.9% increase in absolute risk of special educational need among those exposed to depression." "Antidepressant medication exposure without a record of depression was also associated with increased risk." journals.plos.org/plosmedici…
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Mark Horowitz @markhoro.bsky.social retweeted
This re-analyses shows an influential network meta-analysis of fluoxetine and placebo was influenced by an unreliable 'zombie trial'. If this is removed it shows minimal effects consistent with other meta-analyses. @NaudetFlorian onlinelibrary.wiley.com/doi/…
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I think this is an excellent non-systematic review of the ways that biological reductionism (or the absurd farce that passes for it) misses the point in human emotions. More to the point it hypnotises doctors (and many patients) enough that they will give drugs with serious consequences on the basis of flimsily supported, often fantastical biological rationales
Psychiatrists on social media explaining why you're depressed after an awful breakup and completely missing the point be like
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This is an important step by the VA towards giving truly informed consent for psychiatric medications. What will it take for other health institutions to follow suit?
The VA is expanding informed-consent requirements for psychiatric medications. The @FDADrugs black box warning on all antidepressant identifies increased suicidality risk through age 24. But akathisia does not discriminate based on age. Medication risks deserve informed consent, especially when those risks can end lives. nytimes.com/2026/09/28/scien…
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