Genetic variations

Some studies indicate that variations in genes may play a role in the effectiveness and risk of side effects of specific antidepressants. So your genes may, at least in part, determine whether a certain antidepressant will work well for you and whether you're likely to have certain side effects.

Some locations already provide limited genetic testing to help determine antidepressant choice, but testing is not routine and it's not always covered by insurance.

More studies are being done to determine what might be the best antidepressant choice based on genetic makeup. However, genetic testing is a part of — not a replacement for — a thorough psychiatric exam and clinical decisions.