25 Aug 2026
Signal Headquarters
Vol. I
No. 237
Reference

What is SSRIs?

SSRIs

Selective serotonin reuptake inhibitors (SSRIs) are a type of antidepressant medication. In discussions, they are often evaluated for their efficacy in treating conditions like OCD and depression, with some experts questioning their effectiveness and suggesting alternative approaches.

How it developed

  • Jul 2026 - Andrew Huberman said there is very little, if any, evidence that the serotonin system is disrupted in OCD.
  • Jul 2026 - Andrew Huberman said that combining cognitive behavioral therapy with SSRIs did not lead to further decrease in OCD symptoms.
  • Mar 2026 - Arthur Brooks said exercise was as good as either of those at improving depressive symptoms.

In the evidence

Every line below is attributed to a named speaker.

Contrarian take

SSRIs are effective for OCD yet there is little to no evidence of serotonin-system disruption in OCD, undercutting the standard chemical-imbalance explanation.

“There is very little, if any, evidence that the serotonin system is disrupted in OCD.”
Andrew Huberman · 9 Jul 2026
Contrarian take

Adding SSRIs to CBT produced no further reduction in OCD symptoms beyond CBT alone, contradicting the assumption that combination therapy is superior.

“The combination of cognitive behavioral therapy and the SSRIs together did not lead to any further decrease in OCD symptoms.”
Andrew Huberman · 9 Jul 2026
By the numbers

A new meta-analysis found exercise is as effective as CBT or SSRIs at improving depressive symptoms.

“Exercise was as good as either of those at improving depressive.”
Arthur Brooks · 24 Mar 2026
Worth quoting

Chamath on the pharmaceutical consequence of denying children agency and risk.

“If you don't do those things, by the way, you're going to all of a sudden have people telling you got to put your kids on SSRIs or speed to get them to have those things.”
Chamath Palihapitiya · 29 Jun 2026
Signal Headquarters · reference note, compiled from attributed expert discussion. Last updated 2026-08-22.