Questions about admitting someone to a psych ward?

In most states, there is a provision to have an adult committed who expresses the intention or is believed to be capable or harming himself or others. In FL it's the Baker Act, etc. It will depend on where you live. This is usually a 24-72 hour hold, during which the person can meet with counselors and be thoroughly evaluated. You would initiate this process by calling the police and explaining that it's your belief you brother is in imminent danger from himself. They'll take care of the rest.

If your brother or someone else is in danger, TAKE THIS MEASURE. Too many times family members are left saying, "I didn't really think they were serious." It's serious.

Good luck keeping your brother safe and getting him the help he needs. Be prepared for anything, from vitriolic anger to crying and pleading. It will all work out further up the road; safety is his first priority right now.

Under 18 your parents can have him admitted. Over 18 all you can do is driv him emergency room after an attempt. That's how it was for me my first time admitted there
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In the psych ward the only comps there belong to the staff. No belts are allowed either. Get your brother there especially if mentally ill and suicidal.

Ask a doctor or, better still, a psychiatrist.

Some states you can call a crisis line and have him evaluated.