A counterfeit drug is a fake or unauthorized medication that is deliberately mislabeled with respect to its identity or source. These drugs may contain incorrect, insufficient, or harmful ingredients, posing serious health risks to consumers. Counterfeit drugs are often produced and distributed illegally, bypassing regulatory controls and quality assurance processes. In cybersecurity, the term also relates to the online sale and distribution of such drugs through fraudulent websites, phishing campaigns, and dark web marketplaces. Protecting against counterfeit drugs involves both technical cybersecurity measures and public awareness to prevent the purchase and use of unsafe medications.