Drug Interactions With L-Tyrosine

If certain medications are taken with L-tyrosine, drug interactions may occur. These interactions could affect how the medications are absorbed into your bloodstream or compound their effects. Medications that may cause drug interactions with L-tyrosine include those containing levodopa and thyroid medications. To prevent these and other interactions, tell your healthcare provider about all drugs, vitamins, and supplements you take prior to taking L-tyrosine.

L-Tyrosine Supplement Information

Drug Interactions With L-Tyrosine: An Overview

Even though L-tyrosine (also known just as tyrosine) is a natural product, it can potentially interact with some medicines. Some of the medicines that may lead to drug interactions with L-tyrosine include:

Medications that contain levodopa (Parcopa^®, Sinemet^®, Sinemet^® CR, Stalevo^®)
Thyroid medications, such as:
- Liothyronine (Cytomel^®)
- Liotrix (Thyrolar^®)
- Levothyroxine (Levothroid^®, Levoxyl^®, Synthroid^®, Tirosint^®, Unithroid^®)
- Thyroid (Armor^® Thyroid, Nature-Throid^®).

More Information on Interactions With L-Tyrosine

The following sections explain in detail the potentially negative interactions that can occur when L-tyrosine is combined with any of the drugs listed above.

Medications Containing Levodopa (Parcopa, Sinemet, Sinemet CR, Stalevo)

L-tyrosine could decrease the absorption of levodopa into the bloodstream, perhaps making it less effective. In order to avoid this interaction, be sure to separate levodopa and L-tyrosine dosages by at least two hours.

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