Abstract

Little information is available on clozapine discontinuation rates in developing country settings. The present study aimed to evaluate the incidence and reasons clinicians stopped clozapinine in patients after initiating treatment with the same. In addition, the study also aimed to assess the rechallenge rate, that is, restarting clozapine after a decision to discontinue the same by the clinicians. The treatment records of 859 patients started on clozapine were reviewed to identify the patients for whom the clinician stopped clozapine at least once because of any reason. The reasons for stopping clozapine were reviewed. In addition, the treatment records were also examined for rechallenge with clozapine at a later date. Clozapine was stopped by the clinicians in 44 of the 859 patients (5.12%). The most common reason for stopping clozapine was blood dyscrasias (n = 12), followed by poor adherence making the hematological monitoring difficult (n = 9), and intolerable sedation (n = 7). In half of the patients (n = 22), clozapine was restarted by the clinicians for further management of schizophrenia. Successful rechallenge was done in 58.33% of patients with blood dyscrasias, 44.44% with poor adherence, and 71.4% with intolerable sedation. The present study suggests clinicians stop clozapine in only 5.14% of cases. The most common reasons for clozapine discontinuation by clinicians include blood dyscrasias, poor medication adherence making it challenging to monitor the hemogram, and sedation. However, in half of the patient's clozapine was rechallenged, and all the attempts of rechallenging were successful.

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