of course SSRIs have intense and horrid withdrawl, but arent illegal and on TV ads and everything. so that means something doesnt become illegal if it is dangerious (other drugs), and something doesnt become illegal if it has withdrawl (SSRIs). something only becomes illegal if it can produce euphoria pleasure after a single dose (opioids and others).

withdrawl? who cares, legal.
heath issues? who cares legal.
can produce euphoria? very bad, illegal.