Interchangeability between biological medicines and biosimilars, and subsequent substitution by pharmacists represent an important opportunity for costs savings for health care systems. Because biological medicines are complex products, the expert role of the pharmacist to inform patients and support physicians is indispensable. However, regulations on substitution of biosimilars differ around the globe, such that a substitution that is allowed in one country may be forbidden in another. Overall, pharmacists' knowledge of biosimilar medicines is incomplete and hesitancy to engage in substitutions is perceptible. As counter-balancing remedy, continued education about biosimilars is needed among practicing community pharmacists.