What is Quetiapine-Induced Parkinsonism?

Quetiapine-induced parkinsonism is a movement disorder caused by the medication quetiapine, which is an atypical antipsychotic used to treat conditions like schizophrenia, bipolar disorder, and major depression. Parkinsonism refers to symptoms similar to Parkinson’s disease, including tremors, stiffness, and slow movements, but these symptoms result from the effects of the drug on brain chemistry rather than the disease itself.

What Are the Symptoms of Quetiapine-Induced Parkinsonism?

Symptoms usually develop gradually and can include:

• Tremors, especially at rest
• Muscle stiffness or rigidity
• Slow movements (bradykinesia)
• Shuffling gait or difficulty walking
• Reduced facial expressions (masked face)
• Difficulty with balance and coordination

What Causes Quetiapine-Induced Parkinsonism?

Quetiapine works by blocking dopamine receptors in the brain to manage psychiatric symptoms. Dopamine is important for controlling movement, so its blockade can disrupt normal motor function, leading to parkinsonism. The risk increases with higher doses, long-term use, and individual sensitivity.

How is Quetiapine-Induced Parkinsonism Diagnosed?

Diagnosis is based on:

• Clinical assessment of symptoms and medication history
• Exclusion of other causes of parkinsonism such as Parkinson’s disease or other neurological disorders
• Improvement of symptoms after reducing or stopping quetiapine may support the diagnosis
  Sometimes, neurological tests may be needed to rule out other conditions.

How is Quetiapine-Induced Parkinsonism Treated?

Treatment involves:

• Adjusting the quetiapine dose or switching to another antipsychotic with a lower risk of motor side effects
• In some cases, medications such as anticholinergics or amantadine may be prescribed to relieve symptoms
• Physical therapy can help improve mobility and balance
  Close collaboration with the prescribing doctor is essential to balance psychiatric and movement symptoms.

Can Quetiapine-Induced Parkinsonism Be Prevented?

Prevention strategies include:

• Using the lowest effective dose of quetiapine
• Regular monitoring for early signs of motor side effects
• Informing healthcare providers promptly if movement symptoms develop
• Considering alternative medications if the patient has a history of movement disorders