It is also coming from a throwaway account, so please take "the same dose was less effective" with a grain of salt.
I know many people with depression and anxiety that used ketamine and never experienced this type of response: extremely limited use and immediate reduction in effectiveness.
I don't buy it.
Edit: Initial studies show even microdoses of ketamine can cause immediate and lasting (+2 weeks) reduction in depression and anxiety. One should not be going into a "k hole" which is regarded as somewhat of an overdose even to partiers