A retrospective study of the role of long-acting injectable antipsychotics in preventing rehospitalization in early psychosis with cannabis use.

backgroundDespite compelling evidence that cannabis use is associated with neurocognitive deficits, loss of cerebral gray matter, relapse and rehospitalization, a substantial number of individuals with early psychosis continue to use recreational or medicinal marijuana. One identified pathway to relapse is non-adherence. Recurrent relapses modify the trajectory of illness and culminate in long-term disability. Long-acting antipsychotic medications are superior to oral equivalents in preventing relapse. PURPOSE: The current paper sought to examine the role of long-acting antipsychotics in preventing relapse in cannabis using early psychosis patients.

methodsThe present retrospective study, which was based in an early psychosis program in mid-Michigan, examined the association between patient perceptions of antipsychotic medication and subsequent rehospitalization, among cannabis users (n = 24) and non-users (n = 27). Patient perceptions of antipsychotic medications were assessed using a single question from the NAVIGATE Patient Self-Rating Form:

resultsCannabis users were substantially more likely to report dissatisfaction with antipsychotic medication (Pearson Chi-square 9.67, df = 1.0, p < 0.002), and more likely to experience rehospitalization (Pearson Chi-square 4.40, df = 1.0, p = 0.036). Those maintained on long-acting injectable antipsychotic medications were rehospitalized less frequently when compared to others maintained on oral formulations (Pearson Chi-square 4.61, df = 1.0, p = 0.032).

conclusionsDissatisfaction with antipsychotics may predict non-adherence and subsequent rehospitalization in early psychosis patients who use cannabis. Long-acting antipsychotics may prevent rehospitalization.