What side effect is characterized by dilated pupils due to the use of atropine?

The side effect characterized by dilated pupils due to the use of atropine is mydriasis. Atropine is an anticholinergic drug that inhibits the action of the neurotransmitter acetylcholine at muscarinic receptors. This inhibition leads to the relaxation of the sphincter muscle of the iris, resulting in an increase in pupil size.

Understanding mydriasis is crucial, particularly in clinical contexts where atropine is used to dilate pupils for examinations or in certain medical emergencies. Recognizing this side effect is important for healthcare professionals in monitoring patients and understanding the implications of atropine use. Other terms like miosis refer to constricted pupils, myositis refers to muscle inflammation, and contraction pertains to muscles tightening, which do not relate to the effect of pupil dilation caused by atropine.