The patient, who was found incapable of making treatment decisions, had previously refused anti-psychotic medication while capable.
His mother, acting as his substitute decision-maker, refused consent to new anti-psychotic medication based on his prior wish.
The Consent and Capacity Board found the prior wish inapplicable due to the patient's deteriorated condition and the availability of new, more effective medication with fewer side effects, ordering the mother to consider his best interests.
The Superior Court overturned this decision as unreasonable.
The Court of Appeal allowed the psychiatrist's appeal, restoring the Board's decision, holding that it was reasonable for the Board to conclude the prior wish was not applicable to the changed circumstances and that the substitute decision-maker must act in the patient's best interests.
