Final answer:
The appropriate medication option for a taxi driver with GAD who avoids antidepressant-induced sexual dysfunction and sedating medication is venlafaxine, as it does not generally cause sedation or significant sexual side effects.
Step-by-step explanation:
The suitable medication for a taxi driver diagnosed with Generalized Anxiety Disorder (GAD) who cannot take antidepressants due to sexual dysfunction and needs to avoid sedating medications for work would be venlafaxine. Venlafaxine is a serotonin-norepinephrine reuptake inhibitor (SNRI) that can treat anxiety without the sedative effects that could impair the driver's ability to operate a vehicle. It generally has fewer sexual side effects than some SSRIs and SNRIs. Other options such as imipramine, clomipramine, and mirtazapine may cause sedation or have a known side effect profile that includes sexual dysfunction, whereas benzodiazepines like clonazepam are sedating. Antipsychotics like olanzapine and clozapine are not typically used as first-line treatments for anxiety and can be sedating. Moclobemide, a reversible inhibitor of monoamine oxidase A (RIMA), could be considered but is not among the typical first-line treatments for GAD.