What class of drugs is known to dilate the pupil?

Mydriatics are a class of drugs specifically designed to dilate the pupil. They work by either stimulating the dilator muscle of the iris or inhibiting the sphincter muscle, leading to an increase in pupil size. This dilation is crucial in various diagnostic and therapeutic procedures, such as during retinal examinations or surgeries, as it allows more light to enter the eye and provides a clearer view of the internal structures.

In contrast, miotics, another class of drugs, are used to constrict the pupil. They are often utilized to treat conditions like glaucoma. Antihistamines are primarily used to alleviate symptoms of allergic reactions and do not have a direct effect on pupil size. Analgesics are pain relievers that also do not influence the dilation or constriction of the pupil. Thus, mydriatics are the only class of the listed options effective for pupil dilation.