Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Schedule I
Introduction
Overview
Schedule I or Schedule 1 is a legal category assigned to substances in certain jurisdictions:
- In Australia: Schedule 1
- In Canada: Schedule I (Canada)
- In Estonia: Narcotic Drugs and Psychotropic Substances Act (Estonia)
- In Thailand: Psychotropic Substances Act (Thailand)
- In the United States: Schedule I (US), List of Schedule I drugs
- Internationally under United Nations treaty: Convention on Psychotropic Substances