the effects of psilocybin can be dampened by SSRI/SNRI for up to 3 months after cessation
the effects of psilocybin can be dampened by SSRI/SNRI for up to 3 months after cessation

pure.johnshopkins.edu
Attenuation of psilocybin mushroom effects during and after SSRI/SNRI antidepressant use

paper from Johns Hopkins. I wouldn't say the numbers are rock solid, but it's better than anecdotal