What form of drugs are known as strong depressants used for severe pain?

Narcotics are known to be strong depressants that are specifically utilized for managing severe pain. They work by binding to specific receptors in the brain and spinal cord, which helps in altering the perception of pain and can also induce feelings of euphoria. This class of drugs is often used in medical settings for pain relief in situations such as post-surgery or for chronic pain conditions.

In contrast, amphetamines are stimulants that increase alertness and energy levels rather than providing pain relief. Over-the-counter medications typically include milder analgesics that do not have the potency or the depressant effects associated with narcotics. Hallucinogens, on the other hand, are primarily known for altering perception and mood rather than functioning as pain relievers. Therefore, narcotics stand out as the appropriate answer given their specific role and effectiveness in pain management.