As of 2015, some medications on the list of schedule II controlled substances are hydromorphone, morphine and hydrocodone, while Tylenol with Codeine, benzphetamine and ketamine are examples of schedule III controlled substances, explains the U.S. Department of Justice Drug Enforcement Administration. Schedule IV controlled substances include alprazolam, lorazepam and clonazepam, while schedule V controlled substances include Phenergan with Codeine and Robitussin AC. There are no medications on the list of schedule I controlled substances.
Schedule I controlled substances are not approved for medical use in the United States and carry a high risk of abuse, notes the U.S. Department of Justice Drug Enforcement Administration. Examples include peyote, marijuana, heroin and 3,4-methylenedioxymethamphetamine, also known as ecstasy. Schedule II and schedule IIN controlled substances also carry a high risk of substance abuse, although this list does include some approved medications, several of which are narcotics or stimulants. The risk of abuse is lower for schedule III controlled substances, which are classified as substances that can cause low or moderate physical dependence levels or high levels of psychological dependence. There are also some narcotics on this list.
The risk of abuse is low in schedule IV and schedule V controlled substances, states the U.S. Department of Justice Drug Enforcement Administration. Most schedule V controlled substances are controlled because they contain very small amounts of narcotics. Cough medications containing less than 200 milligrams of codeine per 100 grams fall under this category.