| Summary of the safety profile Smoking cessation with or without treatment is associated with various symptoms. For example, dysphoric or depressed mood; insomnia, irritability, frustration or anger; anxiety; difficulty concentrating; restlessness; decreased heart rate; increased appetite or weight gain have been reported in patients attempting to stop smoking. No attempt has been made in either the design or the analysis of the CHAMPIX studies to distinguish between adverse reactions associated with study drug treatment or those possibly associated with nicotine withdrawal.Clinical trials included approximately 4,000 patients treated with CHAMPIX for up to 1 year (average exposure 84 days). In general, when adverse reactions occurred, onset was in the first week of therapy; severity was generally mild to moderate and there were no differences by age, race or gender with regard to the incidence of adverse reactions. In patients treated with the recommended dose of 1mg BID following an initial titration period the adverse event most commonly reported was nausea (28.6%). In the majority of cases nausea occurred early in the treatment period, was mild to moderate in severity and seldom resulted in discontinuation.The treatment discontinuation rate due to adverse reactions was 11.4% for varenicline compared with 9.7% for placebo. In this group, the discontinuation rates for the most common adverse reactions in varenicline treated patients were as follows: nausea (2.7% vs. 0.6% for placebo), headache (0.6% vs. 1.0% for placebo), insomnia (1.3% vs. 1.2% for placebo), and abnormal dreams (0.2% vs. 0.2% for placebo).Tabulated summary of adverse reactions In the table below all adverse reactions, which occurred at an incidence greater than placebo are listed by system organ class and frequency (very common ( 1/10), common ( 1/100 to <1/10), uncommon ( 1/1,000 to <1/100) and rare ( 1/10,000 to <1/1,000)). Reported postmarketing adverse reactions are also included for which frequency is not known (cannot be estimated from the available data). Within each frequency grouping, undesirable effects are presented in order of decreasing seriousness.| System Organ Class | Adverse Drug Reactions | | Infections and infestations | | Uncommon
| Bronchitis, nasopharyngitis, sinusitis, fungal infection, viral infection,.
| | Metabolism and nutrition disorders | | Common
| Increased appetite
| | Uncommon
| Anorexia, decreased appetite, polydipsia
| | Psychiatric disorders | | Very common
| Abnormal dreams, insomnia
| | Uncommon | Panic reaction, dysphoria, bradyphrenia, thinking abnormal, restlessness, mood swings, depression*, anxiety*, hallucinations*, libido increased, libido decreased
| | Not Known
| Suicidal ideation, psychosis, aggression, abnormal behaviour
| | Nervous system disorders | | Very common
| Headache
| | Common
| Somnolence, dizziness, dysgeusia
| | Uncommon
| Hypertonia, dysarthria, tremor, coordination abnormal, ,lethargy, hypoaesthesia, hypogeusia
| | Rare | Cerebrovascular accident | | Eye disorders | | Uncommon
| Scotoma, scleral discolouration, eye pain, mydriasis, photophobia, myopia, lacrimation increased
| | Ear and labyrinth disorders | | Uncommon | Tinnitus | | Cardiac disorders | | Uncommon
| Atrial fibrillation, palpitations, electrocardiogram ST segment depression, electrocardiogram T wave amplitude decreased, heart rate increased
| | Not Known
| Myocardial infaction
| | Vascular Disorders | | Uncommon
| Blood pressure increased
| | Respiratory, thoracic and mediastinal disorders | | Uncommon
| Dyspnoea, cough, respiratory tract congestion, hoarseness, pharyngolaryngeal pain, throat irritation, sinus congestion, post nasal drip, rhinorrhoea, snoring
| | Gastrointestinal disorders | | Very common
| Nausea
| | Common
| Vomiting, constipation, diarrhoea, abdominal distension, stomach discomfort, dyspepsia, flatulence, dry mouth
| | Uncommon
| Haematemesis, haematochezia, gastritis, gastrooesophageal reflux disease, abdominal pain, change of bowel habit, abnormal faeces, eructation, aphthous stomatitis, gingival pain, tongue coated
| | Skin and subcutaneous tissue disorders | | Uncommon Not Known
| Rash generalised, erythema, pruritus, acne, hyperhidrosis, night sweats
Severe cutaneous reactions, including Stevens Johnson Syndrome and Erythema Multiforme, angioedema
| | Musculoskeletal and connective tissue disorders | | Uncommon
| Joint stiffness, muscle spasms, chest wall pain, costochondritis
| | Renal and urinary disorders | | Uncommon
| Glycosuria, nocturia, polyuria
| | Reproductive system and breast disorders | | Uncommon
| Menorrhagia, vaginal discharge, sexual dysfunction
| | General disorders and administration site conditions | | Common
| Fatigue
| | Uncommon
| Chest discomfort, chest pain, pyrexia, feeling cold, asthenia, circadian rhythm sleep disorder, malaise, cyst
| | Investigations | | Uncommon
| Liver function test abnormal, platelet count decreased, semen abnormal, C-reactive protein increased, blood calcium decreased, weight increased
| * frequencies are estimated from a post-marketing, observational cohort study | |