Which of the following is an example of Class A drugs?

• A. Cannabis, codeine and ketamine.
• B. Heroin, cocaine, MDMA and methamphetamine.
• C. LSD, psilocybin and fentanyl.
• D. Benzodiazepines, tranquillisers and sleeping tablets.

Answer: (B)

Class A drugs are the most tightly regulated because of their high potential for harm and misuse. A widely used example set to illustrate Class A includes heroin, cocaine, MDMA (ecstasy) and methamphetamine. These substances are known for strong addictive potential and serious health risks, which is why they sit at the top level of control.

Heroin is a potent opioid with a high overdose risk and severe physical dependence. Cocaine is a powerful stimulant with acute cardiovascular dangers and high abuse potential. MDMA can cause dehydration, overheating, and neurotoxic effects with repeated use. Methamphetamine is an especially addictive stimulant with long-lasting health and neurological impacts. Together, these drugs exemplify the severe risk profile that characterizes Class A.

The other options mix drugs that are not all classified at this top level in most schedules. Some contain drugs placed in lower classes, or groups that are regulated differently, so they do not represent a single Class A example.