The Controlled Substances Act (CSA) in the United States categorizes drugs into five different schedules based on their potential for abuse, accepted medical use, and safety considerations. Each schedule has specific criteria and regulations regarding the manufacturing, distribution, prescribing, and dispensing of drugs. Here are the criteria for the different schedules:

1. Schedule I:
   • The drug has a high potential for abuse.
   • The drug has no currently accepted medical use in treatment in the United States.
   • There is a lack of accepted safety for use of the drug under medical supervision.
2. Schedule II:
   • The drug has a high potential for abuse.
   • The drug has currently accepted medical use in treatment in the United States or a currently accepted medical use with severe restrictions.
   • Abuse of the drug may lead to severe psychological or physical dependence.
3. Schedule III:
   • The drug has a potential for abuse less than substances in Schedules I and II.
   • The drug has currently accepted medical use in treatment in the United States.
   • Abuse of the drug may lead to moderate or low physical dependence or high psychological dependence.
4. Schedule IV:
   • The drug has a low potential for abuse relative to substances in Schedule III.
   • The drug has currently accepted medical use in treatment in the United States.
   • Abuse of the drug may lead to limited physical dependence or psychological dependence relative to substances in Schedule III.
5. Schedule V:
   • The drug has a low potential for abuse relative to substances listed in Schedule IV.
   • The drug has currently accepted medical use in treatment in the United States.
   • Abuse of the drug may lead to limited physical dependence or psychological dependence relative to substances in Schedule IV.

These schedules are regularly reviewed and updated based on scientific evidence, medical use, abuse potential, and public health considerations. The regulations associated with each schedule aim to balance medical treatment needs with the prevention of drug abuse and diversion.