Many people take SSRIs and other medications because they believe the serotonin imbalance theory to be the modern scientific consensus. A doctor would be fired and ostracized for using the four humours, but can prescribe life-altering medication after five minutes to correct chemical imbalance, a theory which has never had much support within the scientific community.

Indeed, a rebuttal [1] to that paper starts with:

> Moncrieff et al. report in a review of reviews that depression is not generally linked with serotonin deficiency. This is hardly news to neuropharmacologists, which Moncrieff et al. tacitly admits, as they justify their review by citing examples of laity and general practitioners believing depression is caused by a “chemical imbalance”, i.e., in serotonin. For instance, already in 1986 did Depue and Spoont point out that serotonin deficiency may not be a general cause of depression or other psychiatric illness. Further, that increasing extracellular serotonin—e.g., with selective serotonin reuptake inhibitors (SSRIs)—treats depression does not mean decreased serotonin causes depression.

I have a lot of trust in the science of medicine, but almost none in healthcare. It seems like the research is totally divorced from the medieval treatments I see doctors give all the time. "This is hardly news to neuropharmacologists" vs "laity and general practitioners believe ..." indeed.

1. https://www.nature.com/articles/s41380-023-02090-3