The Department of Health and Human Services announces the funding opportunity titled "Mechanism for Time-Sensitive Substance Use Research" under the National Institutes of Health (NIH) and specifically the National Institute on Drug Abuse (NIDA). This project, designated as R21, aims to support pilot, feasibility, and exploratory research concerning substance use epidemiology, prevention, and health services, particularly in response to urgent emerging drug issues or policy changes. Key focus areas include sudden increases in substance misuse, health system challenges, and impacts of public health emergencies on substance use outcomes. Applications must demonstrate a time-sensitive need for expedited review and funding, with a budget cap of $275,000 over two years. Eligible entities include various educational institutions, governmental bodies, and nonprofit organizations. The application process includes specific requirements to follow NIH guidelines, mandatory registrations, and consideration of human subjects in research. Successful applicants will receive an accelerated review process, with potential funding awards expected within six months of application submission, emphasizing the NIH's commitment to addressing critical public health issues effectively and swiftly.