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Updated: May 3, 2026

High-throughput and Comprehensive Drug Surveillance Using Multisegment Injection-Capillary Electrophoresis-Mass Spectrometry
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Reporting a Case of Injecting Methylphenidate (Ritalin) Tablets, Intensified Symptoms of Schizoph-renia or Induce

Alireza Ghaffarinejad1, Ali Kheradmand2

  • 1Associate Professor of Psychiatry, Kerman University of Medical Sciences, Kerman, Iran.

Addiction & Health
|February 5, 2014
PubMed
Abstract

Insights

Methylphenidate injections can trigger psychotic symptoms in schizophrenia patients, even with antipsychotic treatment. This case highlights distinct functional and organic psychoses co-occurring in the same individual.

Area of Science:

  • Psychiatry
  • Pharmacology
  • Neuroscience

Background:

  • Methylphenidate, a stimulant, is known to potentially induce or worsen psychotic symptoms in individuals with schizophrenia.
  • Schizophrenia is a chronic mental disorder characterized by psychosis, affecting thought, perception, and behavior.

Observation:

  • A case study involving a young male patient who injected methylphenidate tablets presented with acute cellulitis and related symptoms.
  • Following recovery from drug-induced psychosis, the patient, diagnosed with schizophrenia, received antipsychotic treatment.
  • Despite consistent schizophrenia medication, the patient experienced recurrent psychotic episodes after subsequent methylphenidate injections.

Findings:

  • The study demonstrates that methylphenidate administration can precipitate psychotic symptoms in patients with schizophrenia.
  • These methylphenidate-induced psychotic symptoms persisted despite ongoing antipsychotic therapy for the underlying schizophrenia.
  • The case illustrates the coexistence of functional psychosis (schizophrenia) and organic psychosis (methylphenidate-induced) within the same patient.

Implications:

  • Methylphenidate-induced psychosis in schizophrenia patients may be refractory to standard antipsychotic treatments.
  • This highlights the potential for distinct etiological pathways leading to psychosis in vulnerable individuals.
  • Clinicians should consider substance-induced psychosis as a differential diagnosis in schizophrenia patients presenting with worsening or new psychotic symptoms.
Keywords:
InjectionMethylphenidatePsychotic disordersSchizophrenia

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