L-Lysine Side Effects
Generic name: lysine
Note: This document contains side effect information about lysine. Some of the dosage forms listed on this page may not apply to the brand name L-Lysine.
Applies to lysine: oral tablet
Follow all directions on the product label and package. Tell each of your healthcare providers about all your medical conditions, allergies, and all medicines you use.
Get emergency medical help if you have signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Although not all side effects are known, lysine (the active ingredient contained in L-Lysine) is thought to be possibly safe when taken for up to a year.
Common side effects may include:
stomach pain and diarrhea.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.
Frequently asked questions
More about L-Lysine (lysine)
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Some side effects may not be reported. You may report them to the FDA.