Opioid Posted on 11th December 201514th May 2021 by ThePD (The Project Definition) Opioids are a class of drugs that include the illegal drug heroin, synthetic opioids. Opioid drugs relieve pain, dull the senses, and induce sleep. Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on LinkedIn (Opens in new window) Related Posted in HSE and tagged health, hse. ThePD (The Project Definition) ThePD has been developing the Preferred Project Definitions based on the actual project execution and operation experiences and knowledge with the Project Language, and sharing with you daily basis.