Final answer:
Among the given options, harm reduction is the most effective term for overdose prevention in primary care settings.
Step-by-step explanation:
When discussing overdose (OD) prevention in primary care (PC) settings, the most effective term among the given options is Harm reduction. Harm reduction focuses on minimizing the negative consequences associated with drug use, rather than strictly advocating for abstinence. It includes measures such as providing clean needles, naloxone distribution, and safe injection sites. This approach has been proven to reduce the risk of overdose and other harms related to drug use.