Dangerous drugs are substances that can put people's health and well-being at risk. There are several synonyms for the term 'dangerous drug.' Some of the commonly used synonyms include harmful drug, hazardous drug, toxic substance, controlled substance, poison, lethal substance, and deadly substance. These terms indicate the potential dangers of consuming these drugs or substances. They are often associated with addiction, abuse, and even fatalities. The usage of these synonyms highlights the seriousness of the issue and emphasizes the need for caution while dealing with such substances. It is important to educate people on the dangers of such drugs to prevent their misuse and promote public health and safety.