Spravato is esketamine - a modified version of ketamine. Ketamine is made up of mirror image molecules and esketamine is the right-handed molecule. They did this because ketamine is off-patent so they needed to modify it in order to patent it, however there is evidence that esketamine is a less effective treatment than ketamine.
It’s very cheap for me but my insurance company pays about $17k a month for this treatment. Ketamine would be a more effective treatment that would be super cheap for them, but they don’t do it because it’s not FDA-approved. So they’re paying a fortune for a less effective treatment.
It would be in the insurance companies’ interests to band together to fund the research so they can save huge amounts of money in the long term but they do not do this.