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If you are currently being treated with any of the following medications, you should not use tyrosine supplements without first talking to your health care provider.
Monoamine Oxidase Inhibitors (MAOIs) -- Tyrosine may cause a severe increase in blood pressure in people taking the antidepressant medications known as MAOIs. This rapid increase in blood pressure (also called "hypertensive crisis") can lead to a heart attack or stroke. For this reason, people taking MAOIs should avoid foods and supplements containing tyrosine. MAOIs include:
Thyroid hormone -- Tyrosine is a precursor to thyroid hormone, so it might raise levels too high when taken with synthetic thyroid hormones.
Levodopa(L-dopa) -- No one should take tyrosine at the same time as levodopa, a medication used to treat Parkinson's disease because levodopa may interfere with the absorption of tyrosine.