Same - Levodopa Interaction
Herbal: Same
Also Known As: S-adenosyl-L-methionine, Ademetionine, AdoMet, S-Adenosyl Methionine, S-Adenosyl-L-Methionine, S-Adénosyl-L-Méthionine, S-Adenosylmethionine, S-Adénosylméthionine, S-Adenosylmethionine Tosylate Disulfate, SAM, SAM-e
Drug: Levodopa
Brand names:
Larodopa, Inbrija
Medical Content Editor Dr. Brian Staiger, PharmD
Last updated
Jun 15, 2025
Interaction Details
Levodopa is classified as belonging to the following category: Levodopa
SAMe might reduce the effectiveness of levodopa.
SAMe methylates levodopa, which might reduce its effectiveness for treating Parkinson disease.
Interaction Rating
Likelihood of Occurrence
PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
References
- Charlton CG, Crowell B Jr. Parkinson's disease-like effects of S-adenosyl-L-methionine: effects of L-dopa. Pharmacol Biochem Behav 1992;43:423-31..
Same Overview
S-adenosyl-l-methionine (SAM-e or SAMe) is a compound that is found naturally in the body and is involved in various processes, including the synthesis of neurotransmitters and the metabolism of hormones. SAM-e has been studied as a potential treatment for a variety of health conditions, including depression, osteoarthritis, and liver disease.
As a dietary supplement, it is most often used for improving symptoms of depression and for osteoarthritis. In regard to depression, research suggests that SAM-e may be more effective than placebo in reducing the severity of depression and may be as effective as certain antidepressants for some individuals. However, more research is needed. Similarly, for osteoarthritis, some studies show that it is as effective in reducing symptoms for some individuals as NSAIDs (e.g., ibuprofen).
There are a variety of different forms of SAM-e supplements available on the market, typically different salt forms (e.g., sulfate, sulfate-p-toluenesulfonate, and butanedisulfonate), which may affect how well it is absorbed.
Levodopa Overview
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Levodopa inhalation is used along with the combination of levodopa and carbidopa (Duopa, Rytary, Sinemet) to treat ''off'' episodes (times of difficulty moving, walking, and speaking that may happen when other medication(s) wear off) in people with Parkinson's disease (PD; a disorder of the nervous system that causes difficulties with movement, muscle control, and balance). Levodopa inhalation will not work to prevent ''off'' episodes but will help to control symptoms when an ''off'' episode has already begun. Levodopa is in a class of medications called dopamine agonists. Levodopa works by mimicking the action of dopamine, a natural substance in the brain that is lacking in patients with PD.
Same - More Interactions
Same interacts with 186 drugs
Interaction Rating Key
These severity listings are for informational use only. Never start, stop or otherwise change your therapy before speaking with your provider.
| Major | The combined use of these agents is strongly discouraged as serious side effects or other negative outcomes could occur. |
| Moderate | Use cautiously under the care of a healthcare professional or avoid this combination. A significant interaction or negative outcome could occur. |
| Minor | Be aware that there is a chance of an interaction. Watch for warning signs of a potential interaction. |
| Unknown | No interactions have been reported or no interaction data is currently available. |
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Parts of this content are provided by the Therapeutic Research Center, LLC.
DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.
© 2021 Therapeutic Research Center, LLC
Drug descriptions are provided by MedlinePlus.
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