Why is sertraline making me so tired

Your doctor may start you on a low dose and gradually increase the dose over time. It’s common to experience headaches, nausea, and fatigue during your first week on Zoloft. These side effects often get better over the first week or two.

Sertraline is sedating, so switching to a less sedating antidepressant dosed in the morning, or to an antidepressant less likely to cause/exacerbate RBD (such as bupropion) may help reduce the frequency of dream enactment.

Sertraline’s effectiveness doesn’t depend on the time it’s taken, but your sleep schedule may be better if you take it at a certain time of day. For some people, sertraline can make you feel tired and sleepy. For others, sertraline can cause insomnia or difficulty sleeping.

SSRIs release two chemicals in the brain that kick in at different times, causing a period of negative effects on mental health, the authors report. The first chemical is serotonin, which is released very soon after an SSRI is taken but might not lessen depressive symptoms until after a couple of weeks.

Why Antidepressants Cause Fatigue

Certain antidepressants work by acting on brain chemicals called neurotransmitters—in particular norepinephrine and serotonin—causing them to linger in the spaces between nerve cells where they carry out their job of regulating mood.