My son is being treated in Germany without any possibility of him adjusting his meds

Perhaps others can comment on this post From the Diagnosed forum:

InternationalMother:

My son had paranoid thoughts after heavy use of cannabis. He moved to Germany and was hospitalized with the diagnosis of schizophrenia years ago. He sees a psychiatrist regularly who won’t adjust his multiple meds despite the many side effects like no sexual arousal, weight gain and difficulty waking up. I’m no longer going to place my trust in the current system. I’m thinking of becoming more involved with his treatment plan.
Suggestions or any like experiences?