This is a good thing to a certain extent. Especially when the voices are intruding in their negativity, repetitiously droning until the end of time. Mucking up every creative activity with past criticisms and present doubt. Wilting your personal creative flower until you are none but dust.
But it also means something else. The antidepressant is not selective in the voices it quiets. The creative voices grow silent as well. And you are left with nothing. Only silence.