An equianalgesic opioid converter is a foundational tool in pain management, used by healthcare professionals to calculate the equianalgesic dose when switching a patient from one opioid to another (opioid rotation) or when changing the route of administration (e.g., from oral to intravenous). This tool is essential because different opioids (such as morphine, oxycodone, hydromorphone, and methadone) possess vastly different analgesic potencies. The converter uses established conversion factors, which represent the dose ratio required to achieve the same level of pain relief between the drugs. It's crucial to note that conversion to certain opioids, especially Methadone, is often dose-dependent, requiring more conservative (higher) conversion factors for higher doses of the source opioid. Correct use of this converter is vital for preventing underdosing (which results in uncontrolled pain) and overdosing (which increases the risk of potentially fatal respiratory depression and other adverse effects), ensuring a safe and effective therapeutic transition.