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Drug Interactions between amantadine and Sinemet CR

This report displays the potential drug interactions for the following 2 drugs:

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Interactions between your drugs

Moderate

amantadine levodopa

Applies to: amantadine and Sinemet CR (carbidopa / levodopa)

Although they are commonly prescribed together, using levodopa with amantadine may increase the risk of side effects of levodopa. You may need a dose adjustment or extra monitoring to safely use both medications. Contact your doctor if you experience confusion, hallucinations, nightmares, increased drowsiness, dizziness, lightheadedness, nausea, and/or vomiting. Avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medications affect you and use caution when getting up from a sitting or lying position. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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Drug and food interactions

Moderate

levodopa food

Applies to: Sinemet CR (carbidopa / levodopa)

Alcohol can increase the nervous system side effects of levodopa such as dizziness, drowsiness, and difficulty concentrating. Some people may also experience impairment in thinking and judgment. You should avoid or limit the use of alcohol while being treated with levodopa. You may experience reduced effectiveness of levodopa in the presence of foods or enteral (tube) feedings with a high protein content. This may make the symptoms of Parkinson's disease worse. Talk with your doctor or nutrition counselor about the best foods to eat while you are taking this medication. Contact your doctor if your condition changes.

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Moderate

levodopa food

Applies to: Sinemet CR (carbidopa / levodopa)

Levodopa and multivitamin with minerals should not be taken orally at the same time. Products that contain iron may interfere with the absorption of levodopa and reduce its effectiveness. You should separate the dosing of these medications by as much as possible. Contact your doctor if your Parkinson symptoms worsen. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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Therapeutic duplication warnings

Therapeutic duplication is the use of more than one medicine from the same drug category or therapeutic class to treat the same condition. This can be intentional in cases where drugs with similar actions are used together for demonstrated therapeutic benefit. It can also be unintentional in cases where a patient has been treated by more than one doctor, or had prescriptions filled at more than one pharmacy, and can have potentially adverse consequences.

Duplication

Dopaminergic agents for parkinsonism

Therapeutic duplication

The recommended maximum number of medicines in the 'dopaminergic agents for parkinsonism' category to be taken concurrently is usually one. Your list includes two medicines belonging to the 'dopaminergic agents for parkinsonism' category:

  • amantadine
  • Sinemet CR (carbidopa/levodopa)

Note: In certain circumstances, the benefits of taking this combination of drugs may outweigh any risks. Always consult your healthcare provider before making changes to your medications or dosage.


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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.