His doctor isn't monitoring correctly. They should drop the dose. Standard treatment is start with a really smart dose then you double it each month for 5 months. In reality, if you're losing weight, you should just keep on that dosage.
Should anyone have to do this? Of course not, but if the choice is between this or projectile vomit every waking hour, it’s not a hard choice IMO.
Lastly, I just wanted to take a moment to think about how useless pharmacies have become that they can’t actually do this for you anymore and literally just count out pills, or more realistically push a button on a machine that counts out the correct amount.