Hello and welcome to Healthcare Magic. Thanks for your query.
Your sister is likely to be suffering from a psychotic disorder
. This is a chronic, relapsing mental illness which can be controlled with medication but not completely cured. If her symptoms are still present despite this dosage of medication, then she may need an increase in dosage or other some medication also. She would be needing to take these medication for long durations and keep having regular follow-ups, otherwise her symptoms may relapse again.
Wish you all the best.
- Dr. Jonas Sundarakumar