Abstract
Pharmaceutical care is a concept that involves identifying, solving and preventing drug-related problems, such as drug interactions, with regards to a patient's drug therapy. Cancer patients are at high risk of drug interactions due to the complex pharmacological profiles and narrow therapeutic indices of anticancer drugs. Furthermore, these patients tend to consume complementary and alternative medicines, thus predisposing them to a risk of herb-drug interactions. This can impact their adherence to anticancer therapies. Various factors are involved in medication non-adherence, such as the cost of medications and patients' beliefs about the value of their treatments. There is a need to understand the impact of non-adherence and optimize intervention strategies from a macro-, meso-, and micro-level. Chapter 1 introduces the concept of pharmaceutical care and the impact of oncology drug interactions and medication non-adherence in patients with cancer. The chapter will also provide an insight to the factors influencing medication adherence and the intervention strategies that have targeted non-adherence.