Which type of drugs does not include mood-altering substances?

The type of drugs that does not include mood-altering substances would be best described as any medication or substance that primarily functions for a specific medical need without significantly impacting one’s emotional state. While stimulants, depressants, and narcotics all have mood-altering effects—stimulants can increase energy and alertness, depressants can lead to relaxation or sedation, and narcotics can produce feelings of euphoria—there are categories of drugs, such as certain therapeutic medications (e.g., antibiotics or anti-inflammatory drugs), that are not designed to alter mood at all.

The assertion that all types of drugs alter mood is misleading because it implies that every substance affects emotional states, which is not the case for many medications that are solely intended for physical health purposes.