This is the common definition of addict.GC §411.171. DEFINITIONS. In this subchapter:
(2) "Chemically dependent person" means a person who frequently or repeatedly becomes intoxicated by excessive indulgence in alcohol or uses controlled substances or dangerous drugs so as to acquire a fixed habit and an involuntary tendency to become intoxicated or use those substances as often as the opportunity is presented.
I am not a lawyer or physician, but I think taking prescription drugs and then stopping permanently means a person is not chemically dependent.
These antidepressants and drugs like Adderall and Ritalin must be used by 10% of the population at one time or another. I have never heard of normal use of them being a problem for getting a CHL.
- Jim