Effects of Smoking Cessation
Some symptoms may be related to nicotine withdrawal associated with stopping smoking. These can include irritability/aggression, dysphoria/depressed mood, anxiety, restlessness, poor concentration, increased appetite/weight gain, urges to smoke (cravings), night-time awakenings/sleep disturbance, decreased heart rate, dizziness, presyncopal symptoms, cough, constipation, gingival bleeding or nasopharyngitis.
Increased frequency of aphthous ulcer may occur after abstinence from smoking. The causality is unclear.
Effects of Vaping Cessation
The nicotine withdrawal effects of vaping cessation have not been established; however it is anticipated that many of the effects relating to nicotine withdrawal will be the same as those seen with tobacco smoking cessation.
Adverse Drug Reactions
This product may cause adverse reactions similar to those associated with nicotine given by other means, including smoking and vaping, and these are mainly dose-dependent. At recommended doses this product has not been found to cause any serious adverse effects. Most of the undesirable effects reported by the patients occur during the first 3-4 weeks after start of treatment.
Excessive consumption of this product by those who have not been in the habit of inhaling tobacco smoke or vaping could possibly lead to nausea, faintness or headaches. Excessive swallowing of dissolved nicotine may, at first, cause hiccupping.
Nicotine from the gum may sometimes cause a slight irritation of the throat at the start of treatment, however most subjects adapt to this with ongoing use. This product may also cause increased salivation.
Allergic reactions (including symptoms of anaphylaxis) can occur during the use of the product.
Those who are prone to indigestion may suffer initially from minor degrees of indigestion or heartburn if the 4 mg nicotine gum is used; slower chewing and the use of the 2 mg nicotine gum (if necessary more frequently) will usually overcome this problem.
The chewing gum may stick to and may in rare cases damage dentures.
The adverse reactions observed in patients treated with oral nicotine formulations during clinical trials and post-marketing experience are listed below by system organ class (SOC). Frequencies are defined in accordance with current guidance, as: very common (>1/10); common (>1/100, <1/10); uncommon (>1/1 000, <1/100); rare (>1/10 000, <1/1 000); very rare (<1/10 000), not known - cannot be estimated from the available data.
| System Organ Class | Reported Adverse Event | Incidence |
| Immune System Disorders | Hypersensitivitya Anaphylactic reactiona | Common Not known |
| Psychiatric Disorders | Abnormal dreams* | Uncommon |
| Nervous System Disorders | Headachea# Burning sensationc Dizziness Dysgeusia Paraesthesiaa Seizures | Very common Common Common Common Common Not known |
| Eye Disorders | Blurred vision Lacrimation increased | Not known Not known |
| Cardiac Disorders | Palpitationsa Tachycardiaa Atrial fibrillation | Uncommon Uncommon Very rare |
| Vascular Disorders | Flushinga Hypertensiona | Uncommon Uncommon |
| Respiratory, Thoracic and Mediastinal Disorders | Cough** Sore mouth or throat Throat irritation** Bronchospasm Dysphonia Dyspnoeaa Nasal congestion Sneezing Throat tightness | Common Very common Very common Uncommon Uncommon Uncommon Uncommon Uncommon Uncommon |
| Gastrointestinal Disorders | Nauseaa Hiccups**** Abdominal pain Diarrhoea*** Dry mouth Flatulence Salivary hypersecretion Stomatitis Vomitinga Dyspepsia Eructation Glossitis Oral mucosal blistering and exfoliation Paraesthesia oral*** Dysphagia Hypoaesthesia oral*** Retching Dry throat Gastrointestinal discomforta Lip pain | Very common Very common Common Common Common Common Common Common Common Common Uncommon Uncommon Uncommon Uncommon Rare Rare Rare Not known Not known Not known |
| Skin and Subcutaneous Tissue Disorders | Urticariaa Hyperhidrosisa Pruritusa Rasha Erythemaa | Uncommon Uncommon Uncommon Uncommon Not known |
| Musculoskeletal and Connective Tissue Disorders | Pain in jawb Muscle tightnessb | Uncommon Not known |
| General Disorders and Administration Site Conditions | Fatiguea Astheniaa Chest discomfort and paina Malaisea Allergic reactions including angioedema | Common Uncommon Uncommon Uncommon Rare |
a Systemic effects; b Tightness of jaw and pain in jaw with nicotine gum formulation
c At the application site
*Identified only for formulations applied during the night
**Higher frequency observed in clinical studies with inhaler formulation.
***Reported the same or less frequently than placebo
**** Higher frequency observed in clinical studies with mouth spray formulation # Although the frequency in the active group is less than that of the placebo group, the frequency in the specific formulation in which the PT was identified as a systemic ADR was greater in the active group than the placebo group.
Reporting of suspected adverse reactions
Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard or search for MHRA Yellow Card in the Google Play or Apple App Store.