Schedule C-I drugs:  
Drugs with a high potential for abuse, no currently accepted medical
use in treatment in the U.S., and no accepted safe level even under
medical supervision. Examples:
Heroin
Certain other opiates and opium derivatives
Ecstasy
Hallucinogens such as LSD, ibogaine, mescaline, peyote, and psilocybin
Marijuana (hashish), its active ingredient (THC), and related
compounds (tetrahydrocannabinols)
Schedule C-II drugs:  
Drugs with a high potential for abuse, but with a currently accepted
medical use in treatment under severe restrictions;
abuse may lead to severe psychological or physical dependence.
Examples:
Opium and opium derivatives not listed in schedule I
Cocaine and other extracts of coca leaves
Fentanyl
Methadone
Schedule C-III drugs:  
Drugs with a potential for abuse less than schedule I or II substances,
but with a currently accepted medical use;
abuse may lead to high psychological dependence or moderate physical
dependence. Examples:
Amphetamine, methamphetamine, and related compounds
Barbiturates
Anabolic steroids
Certain formulations containing strictly limited amounts of codeine
or related compounds
Schedule C-IV drugs:  
Drugs with a potential for abuse less than schedule III substances,
and with a currently accepted medical use;
abuse may lead to limited physical or psychological dependence
compared to schedule III substances. Examples:
Barbital and phenobarbital
Chloral hydrate
Rohypnol
Schedule C-V drugs:  
Drugs with a potential for abuse less than schedule IV substances,
and with a currently accepted medical use;
abuse may lead to limited physical or psychological dependence
compared to schedule IV substances. Examples:
Certain cough medicines and anti-nausea medicines containg
only very limited amounts of codeine, dihydrocodeine, or opium