How to address calcineurin inhibitor–induced psychosis
Here we outline a potential treatment strategy to combat psychosis secondary to calcineurin inhibitors. First, evaluate the patient’s calcineurin inhibitor level (either cyclosporine or tacrolimus). Levels should be drawn as a true trough and doses adjusted if necessary via appropriate consultation with a transplant specialist. Because many of the adverse effects associated with these agents are dose-dependent, we suspect that the risk of psychosis and other mental health–related adverse effects may also follow this trend.
Assuming that the calcineurin inhibitor cannot be stopped, changed to a different agent, or subject to a dose decrease, we recommend initiating an antipsychotic medication to control psychotic symptoms. Given the potential effect of calcineurin inhibitors on dopamine, we suggest trialing a second-generation antipsychotic with relatively high affinity for dopamine D2 receptors, such as risperidone or paliperidone. However, compared with patients with schizophrenia, patients receiving a calcineurin inhibitor may be more likely to develop extrapyramidal symptoms (EPS). Therefore, to avoid potential adverse effects, consider using a lower starting dose or an antipsychotic medication with less dopamine D2 affinity, such as quetiapine, olanzapine, or aripiprazole. Furthermore, because post-transplant patients may be at a higher risk for depression, which may be secondary to medication adverse effects, we suggest avoiding first-generation antipsychotics (FGAs) such as haloperidol because FGAs may worsen depressive symptoms.
We recommend initiating risperidone, 1 mg twice a day, for patients with psychosis secondary to a calcineurin inhibitor. If the patient develops EPS, consider switching to an antipsychotic medication with a less potent dopamine D2 blockade, such as quetiapine, olanzapine, or aripiprazole. We recommend an antipsychotic switch rather than adding benztropine or diphenhydramine to the regimen because many transplant recipients may be older patients, and adding anticholinergic medications can be problematic for this population. However, if the patient is younger or has responded particularly well to risperidone, the benefit of adding an anticholinergic medication may outweigh the risks. This decision should be made on an individual basis and may include other options, such as a switch to quetiapine, olanzapine, or aripiprazole. While these agents may not block the D2 receptor as strongly as risperidone, they all are effective and approved for adjunct therapy in major depressive disorder. We recommend quetiapine and olanzapine as second-line agents because of their potential for sedation and significant weight gain. While aripiprazole has a great metabolic adverse effect profile, its mechanism of action as a partial D2 agonist may make it difficult to control psychotic symptoms in this patient population compared with true D2 antagonists.
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