Diffuse exanthema in a patient receiving varenicline.

Area of Science:

• Dermatology
• Pharmacology
• Clinical Medicine

Background:

• Varenicline is a prescription medication used for smoking cessation.
• Adverse drug reactions can manifest as various dermatological symptoms.
• Identifying potential side effects is crucial for patient safety.

Observation:

• A 71-year-old woman developed a diffuse, bright-red rash and severe itching.
• The rash appeared eight days after starting varenicline for smoking cessation.
• The patient had a history of vascular disease, COPD, and other comorbidities.

Findings:

• The patient's symptoms resolved completely within eight days of discontinuing varenicline.
• Other long-term medications were continued without recurrence of symptoms.
• The temporal association and resolution suggest varenicline as the likely cause of the exanthema.

Implications:

• This case highlights a potential adverse dermatological reaction to varenicline.
• Clinicians should consider varenicline-induced exanthema in patients presenting with new-onset rashes.
• Prompt recognition and discontinuation of the offending agent are key to managing such reactions.