Which of the following is NOT a category of drugs?

Household chemicals are categorized differently than prescription medications, non-prescription medications, and illegal or illicit drugs. The first three categories pertain specifically to substances that are consumed or used primarily for their pharmacological effects on the body. Prescription medications require a doctor's approval to obtain and are used to treat specific health conditions. Non-prescription drugs, or over-the-counter medications, can be purchased without a prescription and are generally considered safe for public use when taken as directed. Illegal or illicit drugs are substances that are banned by law due to their potential for abuse or harm.

In contrast, household chemicals encompass a broad range of products typically used for cleaning, maintenance, or other non-medical purposes—such as detergents, bleach, and solvents. While some household chemicals can be hazardous and require proper handling, they do not fit into the drug categories because they are not intended for consumption as medications or therapeutic substances. Thus, household chemicals represent a separate category that does not align with the intention behind the other listed drug categories.