A possible case of ulcerative colitis (UC) developed during treatment with ixekizumab is reported. Ixekizumab is a human monoclonal antibody approved for chronic plaque psoriasis that works by blocking interleukin-17 (IL-17). Cytoquines, such as IL-17, may be involved in the pathophysiology of psoriasis and inflammatory bowel diseases. We describe the case of a 76-year-old woman who presented with an episode of acute self-limited colitis after receiving ten doses of ixekizumab. It was resolved after treatment withdrawal. A re-challenge was done after 3 months and symptoms returned. Colonoscopy results confirmed the diagnosis of UC. Symptoms remitted after drug discontinuation and treatment with corticosteroids. Four months after stopping ixekizumab, she remains asymptomatic and she is being treated with guselkumab with adequate response. The Naranjo algorithm revealed a probable causal relationship.This adverse event should be taken into account by physicians and pharmacists before prescribing or reviewing therapies in order to improve patients’ safety.

A possible case of bullous pemphigoid (BP) that developed during treatment with ustekinumab is reported. Ustekinumab is a human monoclonal antibody found in pathologies such as psoriasis, which works by inhibiting the activity of interleukin-12 and interleukin-23. We describe the case of a 75-year-old woman who presented with new onset of erythematous and bullous lesions 5 days after receiving a fifth dose of ustekinumab. The patient was treated with corticosteroids and dapsone, whereupon the lesions disappeared. Ustekinumab was withdrawn. Currently the patient remains asymptomatic. In addition, the histopathological and immunofluorescence findings confirmed the diagnosis of BP. Three causality algorithms were applied and revealed a probable causal relationship. There may be a causal relationship between the use of ustekinumab and BP. This association should be taken into account by physicians when prescribing and reviewing drug therapies.

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Statins are widely used in the treatment of hypercholesterolemia. Muscle weakness and elevated creatine kinase (CK) are frequent side effects of statins with an incidence of about 15%. Statin-associated myopathy is more common in people who receive multiple drugs, the elderly or women but the mechanism underlying it is still unclear. These symptoms generally improve after drug discontinuation. However, there is a type of autoimmune mediated myopathy characterised by the persistence of muscle weakness and CK elevation after stopping statins. Herein, we discuss a case of autoimmune myopathy associated with statin exposure and responsive to immunossupresive drugs. The increased use of statins in recent years raises the importance of acquaintance with this disease in clinical practice.