Olanzapine Viatris (Olanzapine)

Olanzapine Viatris is an atypical antipsychotic used across several psychiatric disorder pathways.

• Schizophrenia: helps control delusions, hallucinations and thought disorder.
• Bipolar I disorder (manic episodes): reduces mania severity and stabilises mood.
• Schizoaffective disorder: alleviates both psychotic and mood symptoms.
• Maintenance therapy: helps prevent relapse of psychotic episodes after stabilization.
• Adjunctive treatment: may be added to other psychotropic regimens when monotherapy is insufficient.

• Olanzapine acts as a high‑affinity antagonist at dopamine D2 and serotonin 5‑HT2A receptors, with additional activity at histamine H1, muscarinic and adrenergic receptors. By blocking dopamine and serotonin signalling in key brain pathways, it reduces psychotic symptoms and stabilises mood, while its broader receptor profile contributes to its sedative and metabolic effects.

Olanzapine may cause a range of adverse reactions that vary in frequency and severity.

Common Side Effects

• Weight gain: increased appetite and caloric intake.
• Sedation: drowsiness or feeling unusually sleepy.
• Dry mouth: reduced salivary flow.
• Constipation: slowed gastrointestinal motility.
• Elevated triglycerides: rise in blood lipid levels.
• Orthostatic hypotension: drop in blood pressure upon standing.

Serious or Rare Side Effects

• Neuroleptic malignant syndrome: high fever, muscle rigidity, autonomic instability.
• Tardive dyskinesia: involuntary, repetitive facial or limb movements.
• Hyperglycaemia/diabetes mellitus onset: significant rise in blood glucose.
• Seizures: occurrence of convulsive episodes.
• Agranulocytosis: marked reduction in white‑blood cell count.
• Severe allergic reactions: anaphylaxis, angio‑edema.

When prescribing Olanzapine Viatris, clinicians should consider several safety measures.

• Monitor metabolic parameters: check weight, fasting glucose and lipid profile regularly.
• Assess for cardiovascular risk: evaluate blood pressure and heart rate, especially in patients with orthostatic tendencies.
• Screen for movement disorders: watch for early signs of tardive dyskinesia.
• Evaluate hepatic and renal function: dose adjustments may be needed in impairment.
• Pregnancy and lactation: use only if benefits outweigh risks.
• Store at ambient temperature: keep below 25°C, in the original packaging, protected from moisture.

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