The National Institutes of Health (NIH) is offering a federal grant opportunity titled "Pilot and Feasibility Studies in Preparation for Substance Use and HIV Prevention Intervention and Services Research Trials." This initiative aims to support pilot and feasibility studies that prepare for efficacy, effectiveness, or services research trials focused on substance use prevention, treatment, and HIV eradication, among other related topics. The program encourages applicants to engage relevant stakeholders in the design and execution of their studies, with a well-defined theory of change or logic model expected, although preliminary data is not required. Interested parties can reach out to the NIDA DESPR Program Staff via email at nida-par-26-092@mail.nih.gov for further information, with the estimated synopsis post date set for July 2, 2026, and applications not currently being solicited.