Melissa officinalis, also called lemon balm, is a plant in the mint family. Lemon balm blooms with small yellow flowers in spring and summer, and if you rub the leaves, they smell like lemon. The herb has calming and soothing effects, as explained by the University of Maryland Medical Center. It may have relieve discomfort from indigestion, improve appetite, decrease anxiety and help with sleep. Additionally, lemon balm can treat cold sores, according to the University of Michigan Health System. Lemon balm is generally regarded as safe, and side effects are uncommon.
Eye Pressure
Lemon balm essential oil is included in perfumes, skin creams and massage oil. Studies with animals indicate that lemon balm essential oil may increase pressure in the eye, as noted by the Physicians' Desktop Reference. People with glaucoma should not use this oil.
Considerations for Women
Research on the effects of lemon balm on a developing baby or small child is lacking, as noted by Herbwisdom.com. Because of possible harmful effects, pregnant and breastfeeding women should not use this herb, and it also should not be given to children.
Allergic Reaction
As with any herbal remedy, some people may experience an allergic reaction to lemon balm. Signs, as listed by the Physicians' Desktop Reference, may include difficulty breathing, tightness in the chest or throat, chest pain, hives, a rash, itching or unexplained swelling. An allergic reaction to lemon balm should be considered a medical emergency, as it could lead to life-threatening anaphylaxis.
Sedative Effects
Due to its calming effects, lemon balm may increase the sedative effects of other medications or herbs. Herbwisdom.com cautions that this could result in excessive sedation or mental impairment. St. John's wort, valerian and kava are examples of herbs that can cause sleepiness.
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