BackgroundIn January 2023, following a 20-year ban, the New South Wales (NSW) Needle and Syringe Program (NSP) Guidelines permitted NSPs to provide winged infusion sets (‘butterflies’) and larger-volume syringes (‘barrels’) commonly used for injecting methadone liquid intravenously.ApproachThe Kirketon Road Centre (KRC) integrated the distribution of ‘butterflies and barrels’ (referred to as ‘butterfly packs’) into its service delivery in April 2023 and developed resources in collaboration with