A

Risperidone is an atypical antipsychotic shown to reduce both motor and vocal tics in Tourette’s disorder, the most likely diagnosis in a patient with involuntary blinking and grunting that he cannot suppress [Scahill, 2003, PMID 12505956]. The other options are not first-line tic-suppressing agents: imipramine treats depression/enuresis, carbamazepine treats seizures/mood instability, and methylphenidate treats ADHD.