"There is a reason that many meditation centers have questionnaires about physical and mental history, previous and current medications, psychiatric diagnoses, and the like, as they know that those who are less stable don’t always do well when things get weirder or their concentration gets ramped up. Some of my bipolar and schizophrenic friends who meditate have strongly encouraged me to include something that says to avoid the high-intensity techniques that I present here, to keep things more grounded in physical activities or somatic practices, to use much lower doses of meditation, to practice very gently, and avoid visualization and mantra practices unless you are working very closely with a qualified teacher. Being physically ungrounded, practicing frequently and intensely, and doing visualization and mantra practices without qualified guidance can increase the risks of meditation practice going wrong."

"As an aside, please do not assume that meditation will allow you to come off your meds if you are on meds for something like bipolar disorder or schizophrenia. It is not that gentle meditation can’t help some people with mental illness, as it can, but it can also greatly increase mental instability at times, so keep whoever helps you manage your illness in the loop about what is going on with you if you get into meditation, and be honest with them about what you are experiencing."

- https://www.mctb.org/.../part-vi-my-spiritual.../61-crazy/