You will also often see such packaging used with in hospitals, group homes, and nursing homes. It helps to limit med errors for nurses and cnas and can allow some mentally handicapped people or elderly to have some control over their lives.
It's not a common packaging you are going to get from a pharmacy unless specified for you by a doctor.
Adults are the ones usually killing themselves by overdosing. Suicide is final, and survivors of botched attempts praise that they failed to kill themselves. It's why men have a higher suicide rate, because their method is usually final. Having a packaging that hinders the process of suicide via overdosing is helpful to all involved.