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People often search for lists of “hard drugs,” “street drugs,” or the “7 types of drugs” as if there were clear lines between safe and bad drugs. In reality, many overdoses and serious health problems happen when people mix different types of drugs—both legal and illegal—at the same time. This pattern is called polysubstance use, and when it becomes compulsive and harmful, it’s known as polysubstance addiction.

This guide explains how drugs are classified, which drug categories people commonly combine, why those mixtures are so dangerous, and how comprehensive treatment at Nova Recovery Center can help you or a loved one recover from polysubstance addiction.