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A plain-language summary of the cited sources below. Informational only — not medical advice.
Amantadine works by increasing dopamine activity in the brain. It helps nerve cells produce and release more dopamine, and it slows the process by which dopamine is reabsorbed after being released. This is why it's mainly prescribed for Parkinson's disease and related movement disorders — conditions where dopamine levels are typically low. Your family member might also receive it if they've developed movement side effects from other medications, or less commonly, as influenza A prevention.
The medication stays in the body for roughly 15 hours on average, though this varies between individuals (the range is 10 to 31 hours). This means it's usually taken once or twice daily, and if a dose is missed or the medication is stopped, it takes some time for levels to drop.
Common side effects include a lacy, mottled skin discolouration called livedo reticularis (especially on the legs), ankle swelling, dizziness, light-headedness, and fatigue. Some people experience dry mouth, nausea, constipation, or coordination difficulties. Changes in mood and sleep are also relatively common: your family member might become more anxious, restless, or have trouble sleeping, or they might experience vivid dreams, nightmares, or hallucinations. Difficulty concentrating and shifts in mood — either feeling low or unusually elevated — can occur.
Serious side effects are less common but require prompt medical attention. These include seizures, symptoms resembling neuroleptic malignant syndrome (sudden high fever, muscle rigidity, confusion), heart problems, significant drops in white blood cells, and eye problems such as corneal damage that can affect vision. If your family member develops a high fever with muscle stiffness, new seizures, or any sudden vision changes, contact their doctor immediately.
Amantadine is not suitable for people who are pregnant, breastfeeding, or allergic to the medication or its ingredients.
Parkinson disease Clinical criteria: The condition must be stable for the prescriber to consider the listed maximum quantity of this medicine suitable for this patient, AND The condition must not be drug induced. Treatment criteria: Must be treated by a health practitioner who is any of: (i) a medical practitioner, (ii) an authorised PBS prescriber who is not a medical practitioner, but who is: (a) sharing care of the patient with at least one medical practitioner; (b) intending to share care of the patient with a medical practitioner.
“There is evidence to suggest that amantadine acts as an indirect dopamine receptor agonist, by enhancing the synthesis and release of dopamine from central neurons and delaying the reuptake into synaptic vesicles.”
“Amantadine is eliminated in healthy young adults with a mean plasma elimination half-life of approximately 15 hours (10-31 hours).”
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Curated subset. The full adverse-effect list is in the TGA Product Information; click any citation above to open it.