Any risks that may be associated with nicotine replacement therapy are substantially outweighed by the well-established dangers of continued smoking.
Precautions:
Users should be informed that if they continue to smoke while using the patches, they may experience increased adverse effects due to the hazards of smoking, including cardiovascular effects.
Nicotinell TTS should be used with caution on diseased skin (see section 4.2). In the event of a severe or persistent skin reaction, discontinue treatment and use another pharmaceutical form of nicotine replacement therapy.
Cardiovascular disease
In stable cardiovascular disease Nicotinell TTS presents a lesser hazard than continuing to smoke. However dependent smokers currently hospitalized as a result of a recent myocardial infarction, unstable or worsening angina pectoris including Prinzmetal's angina, severe cardiac arrhythmias, uncontrolled hypertension, or recent cerebrovascular accident and who are considered to be haemodynamically unstable should be encouraged to stop smoking with non-pharmacological interventions (such as counselling). If this fails, Nicotinell TTS may be considered but as data on safety in this patient group are limited, initiation should only be under medical supervision. If there is a clinically significant increase in cardiovascular or other effects attributable to nicotine, the nicotine patch dose should be reduced or discontinued.
Dermatitis
Patients with a history of dermatitis are more likely to experience generalised skin reactions or localized erythema, swelling or rash. In this case a decision must be made whether to discontinue and another pharmaceutical form of nicotine replacement therapy should be considered.
Seizures
Potential risks and benefits of nicotine should be carefully evaluated before use in subjects taking anti-convulsant therapy or with a history of epilepsy as cases of convulsions have been reported in association with nicotine.
Diabetes mellitus
Patients with diabetes mellitus should be advised to monitor their blood sugar levels more closely than usual when nicotine replacement therapy is initiated as catecholamines released by nicotine can affect carbohydrate metabolism and the blood glucose levels may be more variable during smoking cessation, with or without NRT.
Allergic reactions
Discontinuation of treatment may be advisable in cases of severe or persistent allergic reactions.
Angioedema and urticaria have been reported. Contact sensitisation was reported in a few patients using transdermal nicotine in clinical trials. Patients who develop contact sensitisation to nicotine should be cautioned that a severe reaction could occur from smoking or exposure to other nicotine containing products.
Renal and or hepatic impairment
Should be used in caution in patients with moderate to severe hepatic impairment and/or severe impairment as the clearance of nicotine or its metabolites may be decreased with the potential for increased adverse effects (See Dosage and Administration).
Gastro-Intestinal disease
Nicotinell TTS should be used with caution in patients suffering from active oesophagitis, oral and pharyngeal inflammation, gastritis, gastric ulcer or peptic ulcers as their symptoms may be exacerbated.
Phaeochromocytoma and uncontrolled hyperthyroidism
Nicotinell TTS should be used with caution in patients with uncontrolled hyperthyroidism or phaeochromocytoma as nicotine causes release of catecholamines.
Transferred dependence
Transferred dependence is rare and is both less harmful and easier to break than smoking dependence.
Danger in small children
Nicotine is a toxic substance. Doses of nicotine that are tolerated by adult and adolescent smokers can produce severe toxicity in small children that may be fatal (see section 4.9). Both before and after use, the patch contains a significant amount of nicotine. Subjects must be cautioned that the patches must not be handled casually or left where they might be inadvertently misused or consumed by children. Used patches must be disposed of with care by folding them in half with the adhesive sides inwards, and ensuring that they do not fall into the hands of children under any circumstances. Patches should be kept out of the sight and reach of children.
Nicotinell TTS contains aluminium. The patch should therefore be removed prior to undergoing any MRI (Magnetic Resonance Imaging), defibrillation or cardioversion procedures.
Stopping smoking
When a smoker stops, this may result in slower metabolism and a consequent rise in blood levels of such drugs.