What is a common oral side effect of Bupropion?

Bupropion (an atypical antidepressant and smoking cessation aid) commonly causes xerostomia (dry mouth) as one of its most frequently reported side effects, along with insomnia and agitation. Bupropion inhibits neuronal reuptake of norepinephrine and dopamine, and its sympathomimetic properties reduce salivary gland secretion. Xerostomia is clinically important in dentistry as it increases caries risk. Drowsiness (option d) is not typical of bupropion; in fact, it is activating and can cause insomnia.