They can be one of the things that help. Never the only solution. There is not magic combo to make life happen. It can make you able to live life. Like when you have killer headache before a deadline. Painkiller may make able to work. But simply popping ibuprofen will not do the work.
Same with mind altering substances. (which include psych meds.) They can give you the boost or bring your down enough. But they are in no way a miracle cure and I would beware of anybody who spouts it as such.
There is not test for "chemical imbalance" and everybody but Pharma reps moved on from that theory. Your psyche is not that simple.