Antipsychotic medication non-adherence and its determinants among out-patients with schizophrenia.

Introduction: While antipsychotics are key requirement in acute and long-term management of schizophrenia, medication adherence remains a major unmet need in its care. This paper assessed the prevalence of oral antipsychotic non-adherence among outpatients with schizophrenia and its associated clinico-demographic factors.

Method: Three hundred and ten adult outpatients (18-64 years of age) were cross-sectionally interviewed after being diagnosed of schizophrenia using ICD-10 criteria, and the diagnosis confirmed with the Mini International Neuropsychiatric Interview (MINI). The socio-demographic questionnaire, Morisky Medication Adherence scale (MMAS-8), Brief Psychiatric Rating Scale (BPRS), Liverpool University Neuroleptic Side Effects Scale (LUNSERS), Drug Attitude Inventory (DAI-10), Scale to Assess Unawareness of Mental Disorders (SUMD) were used to obtain participants' demographic profile, level of medication adherence, illness severity, attitude towards antipsychotics, and level of insight respectively.

Results: At least one in every two outpatients with schizophrenia (n=158; 51.0%) did not adhere to their antipsychotics as prescribed. The independent risk factors for poor oral antipsychotic adherence were illness severity (p= 0.001; AOR 1.13), psychoactive substance use (p= 0.009; AOR 1.87), young age (p= 0.014; AOR 2.09), perceived poor social support (p= 0.025; AOR 3.58), use of first generation antipsychotics alone (p= 0.006; AOR 17.99), use of second generation antipsychotics alone (p= 0.02; AOR 29.36), and awareness of symptoms (p= 0.025; AOR 1.18).

Conclusion: The high rate of poor medication adherence should necessitate much emphasis on the highlighted modifiable risk factors and the need for continuous adherence assessments and education in clinical practice.