That is according to Margaret Gibney, a carer for someone who is living with psychosis and is struggling to access the right treatment.
There are no readily available statistics for how many patients are taking antipsychotic medication in Northern Ireland, which Ms Gibney says means people like her loved one do not have "appropriate information to make informed choices about their treatment".
The Department of Health said it was working towards a system which will generate "high‑quality data" aimed at improving outcomes for patients.
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