Acute overdose with levodopa. Clinical and biochemical consequences

Area of Science:

• Neurology
• Clinical Pharmacology

Background:

• Parkinson's disease is a neurodegenerative disorder affecting motor control.
• Levodopa is a primary treatment, but overdose effects are not well-documented.

Purpose of the Study:

• To report the clinical and biochemical effects of a massive levodopa overdose in a Parkinson's disease patient.

Main Methods:

• Case report of a patient ingesting 100 gm levodopa over 12 hours.
• Clinical observation of symptoms and adverse effects.
• Biochemical analysis of serum and urine for levodopa and metabolites.

Main Results:

• Complete alleviation of Parkinsonian symptoms.
• Adverse effects: hypertension, hypotension, postural hypotension, tachycardia, confusion, insomnia, anorexia.
• Biochemical findings indicated saturation of dopamine inactivation pathways (sulfation and O-methylation).

Conclusions:

• Massive levodopa overdose can temporarily resolve Parkinsonism but causes significant, transient adverse effects.
• Overdose saturates dopamine metabolism pathways, highlighting the importance of controlled dosing.