|IMAGES IN ACADEMIC MEDICINE
|Year : 2016 | Volume
| Issue : 1 | Page : 103-105
Varenicline-associated cutaneous reaction
Mark William Fegley1, Robert Menak2, Sahil Agrawal3, Sudip Nanda3
1 Department of Family Medicine, St. Luke's University Health Network, Bethlehem, Pennsylvania, United States
2 Department of Pharmacy, St. Luke's University Health Network, Bethlehem, Pennsylvania, United States
3 Department of Internal Medicine, St. Luke's University Health Network, Bethlehem, Pennsylvania, United States
|Date of Submission||20-Sep-2015|
|Date of Acceptance||29-Sep-2015|
|Date of Web Publication||2-Jun-2016|
Department of Internal Medicine, St. Luke's University Hospital Network, 801, Ostrum Street, Bethlehem, Pennsylvania 18015
Source of Support: None, Conflict of Interest: None
We report the first case of varenicline-induced urticaria in a 43-year-old female patient. Varenicline is a partial agonist of the α4β2nicotinic acetylcholine receptor, which is a frequently prescribed smoking cessation aid. Patients need to be aware of drug-induced urticarial reaction, and that prompt medical attention is needed. We review the recognition of mechanisms of pathogenesis and treatment of drug-induced urticaria. In addition, we review the differential diagnosis of urticaria and side effects associated with varenicline and report a novel cutaneous reaction.
The following core competencies are addressed in this article: Patient care and medical knowledge.
Keywords: Urticaria, varenicline, varenicline adverse drug reactions, varenicline-induced urticaria
|How to cite this article:|
Fegley MW, Menak R, Agrawal S, Nanda S. Varenicline-associated cutaneous reaction. Int J Acad Med 2016;2:103-5
| Introduction|| |
We report the first case of varenicline-induced urticaria in a 43-year-old female patient. To our knowledge, only four cases of varenicline-induced cutaneous reactions have been reported. None of the previous cases described urticaria. Drug-induced urticaria is a well-known phenomenon described in literature. The patient should be made aware of the possible development of urticaria, and prompt medical attention is needed. Physicians need to recognize urticaria and distinguish among urticaria, life-threatening angioedema, and anaphylactic reactions.
| Case Report|| |
A 43-year-old Caucasian female with history of smoking, urticaria, and asthma presented with an acute exacerbation of asthma. Recovering on bronchodilators, steroids, and oxygen, the patient expressed an interest in smoking cessation. Varenicline was started, and an urticarial skin rash developed within 4 h of the first dose. The skin rash resolved within 36 h of the treatment of antihistamines, corticosteroids, and discontinuation of the drug.
| Discussion|| |
Urticaria is defined as wheals consisting of three features namely, central swelling with or without erythema, pruritus or sensation of burning, and return to normal appearance usually within 24 h. Urticaria is classified as acute or chronic depending on the duration of episodes as <6 weeks or >6 weeks, respectively [Table 1] and [Table 2]., Drug-induced urticaria is caused by a variety of mechanisms. Drugs such as beta-lactams cause a generalized urticaria via immunoglobulin E (IgE) antibodies. Another mechanism is a drug can act on mast cells directly, such as morphine or codeine. Aspirin and nonsteroidal anti-inflammatory drugs can induce chronic urticaria via arachidonic acid metabolism. Additional drugs well-known to cause urticaria include clotrimazole, trichazole, sulfonamides, anticonvulsants, vecuronium, succinylcholine, vancomycin, and radiocontrast agents [Table 1].,
|Table 1: Differential diagnosis of acute urticaria (episode duration <6 weeks)|
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In our patient, drug-induced urticaria is suggested over erythema multiforme due to history of allergic disorder, absence of history of herpes, asymmetric nonacral distribution with central clearing [Figure 1]a and [Figure 1]b, lack of central disk/blister [Figure 1]c, absence of mucosal involvement [Figure 1]d, and recovery within 36 h of discontinuation with steroid and antihistamine therapy. In addition, drug-induced angioedema is also ruled out due to the lack of involvement of mucous membranes.
|Figure 1: Classic presentation of urticarial skin reaction displaying (a) widespread asymmetric nonacral rash on the lower limbs of the patient (b and c) close up displaying central clearing and lack of central disk/blister (d) lack of mucosal involvement|
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Varenicline is a partial agonist of the α4β2 nicotinic acetylcholine receptors. It simultaneously blocks and elicits a partial nicotine-like central nervous system response, decreasing craving, and withdrawals. In a study by Oosterhuis with 1418 patients, adverse drug reactions (ADR) are common, and at least one ADR was reported by 58.8% of respondents. The most common side effects are nausea (30.8%), abdominal pain (11.2%), and abnormal dreaming (10.4%). Less common side effects included depressed mood, headache, dry mouth, insomnia, and behavioral disturbances. Varenicline-induced adverse cutaneous drug reactions are rare, with only four cases reported to our knowledge. Three cases of exanthemas have been reported described as pustulosis.,, One case of a photoallergic reaction mimicking brachioradial pruritus has been reported.
We report the first case of varenicline-associated urticaria. We postulate that varenicline caused cutaneous mast cell degranulation in our patient. This can be either due to an IgE antibody-mediated mechanism (our patient has asthma) or direct mast cell degranulation due to the quick resolution of her urticaria. Prompt treatment with antihistamines and drug discontinuation is the mainstay of treatment with possible addition of corticosteroids depending on severity. Occasionally, drug-induced urticaria can progress to life-threatening angioedema or systemic anaphylactic reaction. Prompt treatment with epinephrine can be lifesaving. Varenicline is a commonly prescribed anti-smoking cessation aid that is becoming more frequently used. The patient needs to be aware that drug-induced urticaria is a possible side effect and that prompt medical treatment is advised.
| Conclusion|| |
Varenicline is a partial agonist of the α4β2 nicotinic acetylcholine receptor. We report a case of varenicline-induced urticarial reaction. The reaction was likely due to IgE antibodies or direct mast cell degranulation. Prompt medical treatment of urticaria is advised, and the patient should be aware of possible skin reactions while taking varenicline.
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Conflicts of interest
There are no conflicts of interest.
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[Table 1], [Table 2]