Your brother is a lucky man to have a family that loves him and wants so much to help him. You already know that your brother is seriously mentally ill. He probably does need the medications that his psychiatrist is prescribing. Unfortunately, I don’t know anything about the services available in your country. All I can tell you is what I would suggest to someone in the U.S. and hope that it is somewhat useful to you.
My first concern would be whether your brother is accurately telling his psychiatrist about how he behaves and what he feels. If he will let you, I suggest you accompany him to his appointments and ask that you be allowed to share your observations with his doctor for at least part of his session. The remainder of the session is for his private conversation with the doctor. I also suggest that you and your family start some family therapy or get involved in a support group for family members of people with severe and persistent mental illness. Having a family member who is so ill is very, very stressful on any family. A therapist or a support group will give you all both support and some practical advice for how to handle your brother so his illness doesn’t tear up your family. A family therapist may want to include him in some of your sessions together to help him accept your help.
Finally, I don’t know if there are any community services available in your country for people like your brother. At least in some parts of the U.S., there are staffed group residences and work programs that serve those with severe mental illness. When someone doesn’t respond optimally to treatment, such programs can at least give the person a home, meaningful work, and the “safety net” of staff who make sure they get to their appointments and live a reasonably safe life.
I’m very sorry that I can’t be more specifically helpful. Perhaps your brother’s psychiatrist can give you and your family some guidance about what services are available in your own country.
I wish you well.