Depends on the intent of the focus. Buddhist tradition even has uses for meditating on that which neither "is" nor "isn't". As for SSRI's, I can't really give an educated opinion.
@Doragon What @J.T. said is correct. To be quite honest with you it doesn't necessarily matter (in terms of focusing on all being or non being), unless you happen to be Buddhist. Committing to either path to it's mystical fulfillment is difficult, but to commit to the understanding of the Monad through non being would require almost immediately some serious detachment from material affairs.
In fact, it's generally imperative that meditations are performed in sobriety, so as to ascertain the 'temperature' within various states of consciousness.
One such instance, I recall reading, a Jewish man is now on treatment after his practice of TDM for some reason removed his ability to properly digest food.
Just wondering if there's a known problem for people trying to get in touch with spiritual or esoteric layers while they might be on ssris or other medications for whatever reason
