SSRIs
Sunfish,
SSRIs are not a tranquiliser, they are an antidepressant. Their authorised indications in Australia (depending on the particular compound) are for the treatment of major depressive disorders, obsessive-compulsive disorder, and panic disorder.
Like all medications, they have side-effects which should be carefully weighed against the benefit that they provide. The current recommendation is that, once commenced, they be continued for at least 6 months. Studies show that stopping the medication in less than 6 months leads to a far higher risk of recurrence of symptoms. Withdrawal symtoms on ceasing the medication(although usually minor, but not always) can last weeks to several months.
As far as your renewal goes, CASA evaluate all cases individually. It may be worth speaking to them before embarking on this course of action.
Cheers,
BM