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Controlled Substance

What Is a Schedule I Controlled Substance?

Schedule I substances will not be seen in a pharmacy. They are the most restricted of all scheduled substances and include many illegal drugs. With the exception of medical marijuana in some states, healthcare providers cannot prescribe substances classified as Schedule I. These substances have the following characteristics:
 
  • High abuse potential
  • No medical use in the United States
  • Lack of data on the drug's safety in humans even under medical supervision.
     
Examples of Schedule I substances include:
 
  • Heroin
  • Lysergic acid diethylamide (LSD)
  • Marijuana
  • Peyote (contains the hallucinogenic substance mescaline).
     

What Is a Schedule II Controlled Substance?

Schedule II substances are the most restricted drugs seen in a pharmacy. They require a written prescription every time because no refills can be given on Schedule II drugs. These substances have the following characteristics:
 
  • High abuse potential
  • Have a currently accepted medical use in the United States or have a medical use with severe restrictions
  • Abuse of the drug may lead to severe physical or psychological dependence.
     
Examples of Schedule II substances include:
 
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