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Side Effects and Precautions<br /><br />Methionine can cause allergic reactions and other side effects, regardless of the form its taken in. The most common side effects are nausea and vomiting. Some people feel drowsy after taking it. Emergency medical attention may be necessary if a person shows signs of a several allergic reaction such as difficulty breathing, chest tightness, and swelling.<br /><br />Pregnant women or nursing mothers should not take methionine supplements without first consulting their healthcare provider, because it's not clear how they affect a postpartum body. Those who take oral contraceptives should also inform a medical professional before taking it, since it increases estrogen production. This amino acid can worsen existing conditions such as liver disease, acidosis, and schizophrenia. While it has no known negative interactions with other drugs, patients should tell their medical care provider about any other medications or supplements they are using prior to starting methionine.
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