Which drug falls under the category of commonly misused opiates?

Heroin is indeed categorized as a commonly misused opiate. It is an illegal substance derived from morphine, which is itself an opiate. Heroin is known for its potent effects, leading to high levels of dependency and addiction. The drug interacts with the brain's opioid receptors, producing feelings of euphoria, pain relief, and a sense of relaxation. This high potential for abuse, combined with its prevalence in various communities, makes it a significant public health concern in terms of misuse and overdose.

Other choices, such as cocaine and psilocybin, are not classified as opiates. Cocaine is a stimulant drug, while psilocybin is a naturally occurring psychedelic compound. Fentanyl, although an opiate and highly misused, is typically associated with prescription misuse and overdose rather than being classified the same way as traditional opiates like heroin. Thus, heroin remains the archetypal example of commonly misused opiates in this context.