Letters to the Editor

Long-Acting Injectable Clozapine Not Available in the United States

American Family Physician. 2023;107(6):568.

Author disclosure: No relevant financial relationships.

To the Editor: As a psychiatrist and family physician, I appreciated the excellent coverage of schizophrenia by Drs. Crawford and Go.1 I agree that refractory schizophrenia should be treated with clozapine (Clozaril), often earlier during care than is commonly administered. However, clozapine is not available in the United States in a long-acting injectable form, although this would be a wonderful addition to our armamentarium. There are protocols in the U.K.'s Public Health Service for the use of intramuscular clozapine in treatment-refractory psychosis using an unlicensed injectable product made in the Netherlands and imported.2 Clozapine is sometimes administered together with a long-acting antipsychotic in Canadian and U.S. clinics but is generally reserved for the most refractory patients and with close monitoring.3

Editor's Note: This letter was sent to the authors of “Schizophrenia,” who declined to reply.

Linda J. Griffith, MD, FAAFP, DFAPA

Yellow Springs, Ohio

Author disclosure: No relevant financial relationships.

  1. 1.Crawford P, Go KV. Schizophrenia. Am Fam Physician. 2022;106(4):388-396.
  2. 2.Hertfordshire Partnership University. NHS Foundation Trust. Guidelines for the use of intramuscular (IM) clozapine treatment for inpatients. April 2019. Accessed December 15, 2022. https://www.hpft.nhs.uk/media/4159/guidelines-for-the-use-of-intramuscular-im-clozapine-treatment-for-inpatients.pdf
  3. 3.Grimminck R, Oluboka O, Sihota M, et al. Combination of clozapine with long-acting injectable antipsychotics in treatment-resistant schizophrenia: preliminary evidence from health care utilization indices. Prim Care Companion CNS Disord. 2020;22(4) ): 19m2560.

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This series is coordinated by Kenny Lin, MD, MPH, deputy editor.

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