What is the most common side effect of oclacitinib?

Oclacitinib, a Janus kinase inhibitor used primarily for the treatment of atopic dermatitis and other allergic conditions in dogs, has a side effect profile that is well documented in veterinary literature. Among the potential adverse effects, diarrhea is the most commonly reported. This can be attributed to oclacitinib's action, which can lead to gastrointestinal changes in susceptible animals. The occurrence of diarrhea can be dose-dependent, and while it varies between individual patients, it is frequently noted in clinical settings. Monitoring the gastrointestinal health of dogs on this medication is essential to manage and address possible side effects effectively, thereby ensuring the proper adjustment of treatment when necessary.