After receiving diphenhydramine,a patient complains of having a dry mouth.Which drug effect is this patient experiencing?

A) Side effect
B) Adverse reaction
C) Toxic reaction
D) Supportive effect

Diphenhydramine

An antihistamine medication used to relieve symptoms of allergy, hay fever, and the common cold, as well as for sedation and to treat motion sickness.

Dry Mouth

A condition characterized by a lack of adequate saliva production, leading to discomfort and potential oral health issues.

Side Effect

A typically undesirable effect of a medication or treatment that occurs in addition to the intended therapeutic effect.