https://www.cambridge.org/core/journals/the-british-journal-of-psychiatry/article/retrospective-study-of-intramuscular-clozapine-prescription-for-treatment-initiation-and-maintenance-in-treatmentresistant-psychosis/18360F55ADED98C47097D271AB789A21

Clozapine is the most effective antipsychotic, but often not prescribed due to concerns about treatment adherence. An intramuscular preparation is now available and may offer a solution to at least starting people on this valuable medication.