Gerald has been diagnosed with obsessive-compulsive disorder (OCD) .He has been taking his medicine regularly, but has begun to experience side effects such as constipation and drowsiness.Which drug is he most likely taking for his symptoms?

A) Tricyclic antidepressants
B) Benzodiazepines
C) Phenothiazines
D) Selective serotonin reuptake inhibitors (SSRIs)

Selective serotonin reuptake inhibitors (SSRIs) are commonly used to treat OCD. The side effects of constipation and drowsiness are potential side effects of SSRIs. Tricyclic antidepressants and phenothiazines are not typically used to treat OCD. Benzodiazepines may temporarily help with anxiety symptoms associated with OCD, but are not a first-line treatment and can also cause drowsiness as a side effect.