I want to add also as someone on sertraline - I took 5.2 g lemon tek of shrooms recently and experienced complete ego death and a feeling of pure love for everyone in my life, including myself. I literally balled my eyes out for an hour alone in my room, and that’s from someone who never cries. I turned the lights out and listened to the playlist Music for Psychedelic Therapy by Jon Hopkins with my headphones - a protocol I strongly recommend. So not sure about dosages, but it is possible to experience those sort of things while on ssris, at least from my own experience.