I agree with all the posts above; staying curious, respectful to the client especially around the side effects they are experiencing is super important. I have not worked with a client who experienced psychosis before, but for the teens I do work with that has depression or anxiety, I find listening to their concerns and providing information the pros and cons of the medication does help them feel more at ease. Also encouraging them to have a discussion regarding what healthy lifestyle might look like so that they can use that to cope with the side effects can be beneficial.