Which class of drugs is characterized by side effects such as pinpoint pupils?

The class of drugs that is associated with side effects such as pinpoint pupils is depressants. Depressants, which include substances like opioids, barbiturates, and benzodiazepines, typically slow down brain activity, leading to effects such as sedation and relaxation. One of the physiological effects of certain depressants, particularly opioids, is miosis, which is the constriction of the pupils to a pinpoint size.

In contrast, stimulants generally have the opposite effect, leading to dilated pupils, increased heart rate, and heightened alertness. Psychedelics can also affect pupil size, but they usually cause dilation rather than constriction. Antidepressants can vary widely in their effects and side effects, and while some may lead to changes in pupil size, they are not specifically characterized by pinpoint pupils. Therefore, the characteristic side effect of pinpoint pupils aligns distinctly with depressants.