C-I

Medical abbreviation · Pharmacy

C-I
Stands forSchedule I controlled substance
CategoriesMedical

C-I stands for Schedule I controlled substance, a pharmacy abbreviation.

Federal classification for substances with a high potential for abuse, no currently accepted medical use in US treatment and a lack of accepted safety under medical supervision. Heroin, LSD, MDMA and psilocybin are Schedule I.

Example: The research protocol for psilocybin required a DEA C-I researcher registration.

Usage notes

Schedules come from the Controlled Substances Act of 1970 and are maintained by the DEA. Schedule I drugs cannot be prescribed, but registered researchers may study them, and the FDA has granted breakthrough therapy designations for psilocybin and MDMA-assisted therapies. Also written CI or "Schedule 1".

More pharmacy abbreviations

  • BLA – Biologics License Application
  • BOP – Board of pharmacy
  • BP – British Pharmacopoeia
  • BPMH – Best possible medication history
  • BTC – Behind the counter
  • BUD – Beyond-use date
  • C-II – Schedule II controlled substance
  • C-III – Schedule III controlled substance
  • C-IV – Schedule IV controlled substance
  • C-V – Schedule V controlled substance
  • CACI – Compounding aseptic containment isolator
  • cap – Capsule

See all 134 pharmacy abbreviations →

Edited by the AbbreviationList.com team. Spotted an error or a missing meaning? Contact us.

This entry is for general education and is not medical advice. Abbreviation use varies between institutions; always confirm in context.