Taken by mouth, lemon balm is usually well tolerated in recommended doses up to 30 days in otherwise healthy adults. Side effects can include drowsiness, sedation, headache, nausea, vomiting, abdominal pain, dizziness, sleep disturbances, and wheezing. When it is applied to the skin, it can cause local skin reddening, irritation, pigmentation, tingling, and a burning sensation.
Lemon balm can cause drowsiness. Do not drive or engage in other activities requiring alertness if the product affects you in this way.
Do not take lemon balm with alcohol or other medications or health products with sleep-inducing properties (e.g., antidepressants, lorazepam). Using these products together can cause excessive drowsiness and sleepiness. Due to its sleep-inducing properties, lemon balm may strengthen the effects of anesthesia and other medications used during surgery. Stop taking lemon balm at least 2 weeks before surgery.
Lemon balm may also interact with thyroid replacement therapy (e.g., levothyroxine).
Do not use lemon balm if you are allergic to it. If you experience a severe allergic reaction (swelling of the face and throat, difficulty breathing), stop using the supplement and seek medical attention.
If your symptoms persist or worsen, contact your heath care provider.
If you are taking lemon balm to help sleep, consult your health care provider if you still have trouble sleeping after using lemon balm for more than 4 weeks.
It is not known whether lemon balm is safe for in pregnant and breast-feeding women to use. Talk to your doctor if you are pregnant or breast-feeding before using this supplement.
Before taking any new medications, including natural health products, speak to your physician, pharmacist, or other health care provider. Tell your health care provider about any natural health products you may be taking.
