I encourage you to ask your question of Dr. Schwartz on our Depression Community.
And, of course, this is something that should be discussed with your prescribing doctor.
But since you posted here on our Substance Abuse board, is there a concern about addiction? If so, you might want to discuss that aspect here and if you post on Depression, explain there what all is involved, how much you are taking, etc.View Thread
Our experts look in here about once per week, usually towards the end of the week or over the weekend.
I realize this won't be soon enough for you and hope you will contact a doctor to help you through this. You need and deserve support through this process. Please take care of yourself and I hope you'll keep us updated on your discussion as to how you're doing.View Thread
It sounds like a difficult situation for you and your family. It's clear you care about your brother and would like to see him get help.
Unfortunately, no one online can really even guess at what's going on for him. Can you approach him with your concern and support him in at least starting by seeing a doctor. Even if it's due to being alone for so long and not developing social skills, that can be helped and therapy may make a huge difference for him.