Hi,
I understand your concern.
It is caring of you to ask. Delusions of persecution can be challenging, but with the right treatment, usually a combination of medication, therapy, and supportive care, many do improve significantly.
Recovery depends on the cause, early intervention, and consistent support.
You are doing the right thing by being informed and supportive, friends play a big role in healing.
Health Tips
Encourage your friend to seek professional help, stay patient , non-confrontational, avoid arguing about their beliefs, and gently offer consistent emotional support.