I understand lack of sexual desire is a side effect of Zoloft (sertraline). However, I feel a lack of emotion (ie, happy, sad, . ..) is this also a side effect?

SSRIs. Zoloft (sertraline) is an antidepressant of the ssri class. Some people report feeling apathetic or their emotions are blunted while on these medicines.Let the doctor who prescribed zoloft (sertraline) know. A change in dose, switch to a different medicine or addition of another can help.