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Medications and Drugs

Brand Names:

Generic Name: lysine (Pronunciation: LYE seen)

What is lysine ()?

Lysine is an essential amino acid. Essential means that it is not produced by the body and therefore it must be taken in either by diet or by taking supplements. Lysine is found in foods such as yogurt, fish, cheese, brewer's yeast, wheat germ, pork, and other meats.

Lysine has been used to treat or prevent herpes infections (genital herpes and cold sores) and canker sores. It has also been used to treat symptoms of Bell's palsy, and to improve calcium use in the body.

Lysine has not been approved by the FDA to treat any disease, and it should not be substituted for prescription medications.

Lysine may also have uses other than those listed in this product guide.

What are the possible side effects of lysine ()?

Stop taking lysine and seek emergency medical attention if you experience symptoms of a serious allergic reaction including difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives.

Side effects other than those listed here may also occur. Talk to your doctor, pharmacist, or healthcare provider about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about lysine ()?

Lysine has not been approved by the FDA to treat any disease, and it should not be substituted for prescription medications.

Lysine has not been evaluated by the FDA for safety, effectiveness, or purity. All potential risks and/or advantages of this product may not be known. Additionally, there are no regulated manufacturing standards in place for these compounds. Some marketed herbal supplements have been found to be contaminated with toxic metals or other drugs. Herbal/health supplements should be purchased from a reliable source to minimize the risk of contamination.



Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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