Final answer:
Stimulants, depressants, and anxiolytics are classes of drugs that are not considered anti-depressants.
Step-by-step explanation:
The classes of drugs that are not considered anti-depressants are stimulants, depressants, and anxiolytics.
Stimulants, like caffeine and amphetamines, increase alertness and wakefulness.
Depressants, such as alcohol and opioids, calm the brain and induce sleepiness.
Anxiolytics, like benzodiazepines, have a tranquilizing effect and inhibit anxiety.