This is frustrating to me as a long time psych med user. If the meds have intolerable side effects then the meds do not help. Period. I do better off my meds than anything they ever tried to give me.
The system failed your friend. Not his ability to tolerate these horrible side effects.
IF we actually cared about human life we would have done much more to help your friend, but we did not. We care about human life up to the point it starts diminishing our comfort, and I am afraid we are valuing our comfort more and more than we care about others who are suffering in the last thirty years.