Switching Treatment in Schizophrenia: Managing Long-term Adverse Effects : Pre-test

1.

A patient with schizophrenia has had a partial response to antipsychotic treatment but is concerned about long-term adverse effects (AEs). The healthcare professional (HCP) is reviewing different treatment mechanisms, including dopamine receptor–modulating agents and a muscarinic cholinergic.

Based on the patient’s partial response and concern about long-term AEs, which statement should guide your selection between dopaminergic and muscarinic treatment approaches?

A. Dopamine receptor–blocking or dopamine receptor–modulating antipsychotics remain clinically important, while muscarinic M1/M4 receptor activation offers a mechanistically distinct approach that may be useful for selected patients whose treatment is limited by certain dopamine-related AEs
B. Muscarinic receptor agonism has replaced dopamine receptor modulation as the preferred first-line mechanism for all patients with schizophrenia
C. Dopamine receptor–blocking antipsychotics are no longer useful because they do not reduce positive symptoms
D. Muscarinic therapies are best understood as adjunctive treatments for extrapyramidal symptoms (EPS) rather than as antipsychotic therapies

2.

An HCP is reviewing emerging evidence for xanomeline/trospium in adults with schizophrenia and wants to place the data in appropriate clinical context.

Which interpretation of the current clinical evidence for xanomeline/trospium is most appropriate?

A. Xanomeline/trospium has shown placebo-controlled efficacy in acute schizophrenia trials, with gastrointestinal AEs as prominent tolerability considerations and limited long-term comparative data
B. Xanomeline/trospium has been proven superior to all dopamine-blocking antipsychotics in head-to-head relapse-prevention trials
C. Xanomeline/trospium has no clinically meaningful efficacy signal, but it is used because it has no AEs
D. Xanomeline/trospium has definitive evidence for reversing cognitive impairment and negative symptoms as primary endpoints in chronic schizophrenia

3.

A patient with schizophrenia is being transitioned to xanomeline/trospium after experiencing poor tolerability with a dopamine-blocking antipsychotic. The patient and family ask how to take the medication and what AEs they should monitor.

Which counseling strategy would you use when initiating xanomeline/trospium?

A. Start at the highest dose to achieve rapid symptom control, take with meals to reduce nausea, and use diphenhydramine as needed for sleep
B. Start at 50 mg/20 mg twice daily, titrate based on tolerability and response, take doses at least 1 hour before or 2 hours after meals, and monitor for gastrointestinal and anticholinergic AEs
C. Use trospium alone for several days before adding xanomeline to confirm tolerability and avoid constipation
D. Avoid dose titration because gastrointestinal effects are unrelated to dose or administration timing

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Switching Treatment in Schizophrenia: Managing Long-term Adverse Effects

Joseph P. McEvoy, MD

Pretest

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