Side effects of Nicorette gum include dental pain, oral irritation, increased heart rate, increased blood pressure and hiccups, according to MedicineNet. The nicotine gum may also cause heartburn, indigestion and nausea.
Possible side effects of nicotine, the active ingredient in Nicorette gum, include sore throat, mouth sores, blisters and belching, according to Drugs.com. Users may feel unusually tired, and tooth problems may occur as well as neck, jaw and mouth pain as nicotine releases into the system. More serious side effects include blurred vision, dizziness, headache, nervousness and a pounding sensation in the ears. Rare side effects, such as a rapid heartbeat, rash, itching, hives and skin swelling, may also occur, and if any of these appear, individuals should contact a doctor immediately. A nicotine overdose requires emergency medical attention.
Before using nicotine gum, individuals should tell their doctor if they are taking asthma medications, insulin, antidepressants, blood pressure medications and additional smoking cessation medications, as confirmed by MedlinePlus. Users should avoid other nicotine products, including cigarettes, while using nicotine gum due to the high possibility of overdose. Women who are pregnant or breastfeeding should avoid nicotine gum, and those on a sodium-restricted diet should consult a doctor before using it, as well.