PDF of Ask a Pharmacist 0213

How are drugs classified as 
controlled substances? 

Medications are deemed controlled substances by the US Attorney General, based on recommendations from the FDA and Secretary of the Department of Health and Human Services. The decision involves two primary considerations: whether use of the drug may lead to physical or psychological dependence, and whether the drug has an acceptable medical use. Assessment of these factors includes many aspects, such as scientific knowledge of the compound, potential for abuse or dependence, significance of abuse or dependence, public health risks, and if the drug is an immediate precursor for a controlled substance. Medications are defined within five levels of control, also known as schedules.

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Schedule I High abuse potential; has no accepted medical use (eg, heroin)

Schedule II High abuse potential; has accepted medical use (eg, oxycodone, morphine)

Schedule III Relatively lower abuse potential; has accepted medical use (eg, testosterone and other anabolic agents, hydrocodone/acetaminophen combination products)

Schedule IV Relatively lower abuse potential; has accepted medical use (eg, lorazepam and other benzodiazepines)

Schedule V Relatively lower abuse potential; has accepted medical use (eg, codeine cough syrups and Lomotil [diphenoxylate/atropine])

Some medications may appear under multiple schedules depending on the amount of the medication in the product. One example is codeine. Based on the amount of codeine in the product, it may be classified as Schedule II (codeine only), Schedule III (codeine/acetaminophen tablets), or Schedule V (codeine cough syrups containing a small amount of codeine per mL).

The classification of a medication as a controlled substance, and its schedule, can change over time. For example, a medication that was initially not considered a controlled substance may be reclassified if concern for its abuse potential increases. One recent example of this is the skeletal muscle relaxant carisoprodol (Soma), which was not previously considered a controlled substance. After an extensive data collection and review period that included clinical data, law enforcement testimony, and drug use patterns, the FDA concluded that dependence and abuse may occur. Carisoprodol was reclassified as a Schedule IV drug.

Drug Disposal Program

The Drug Enforcement Administration (DEA) sponsors Prescription Drug Take-Back events each year. In 2012, these events collected more than 
244 tons of prescription medications. The next event is scheduled for Saturday, April 27, 2013. Go to 
disposal/takeback/ on April 1 to find a collection site near you.

Lisa A. Thompson, PharmD, BCOP
, is Assistant Professor, Department of Clinical Pharmacy, University of Colorado Skaggs School of Pharmacy and Pharmaceutical Sciences, Aurora, Colorado.