Yes, Zoloft (sertraline) can make some people feel tired or drowsy, especially in the first few weeks, but for others it has little effect on energy or can even feel energizing.

Quick Scoop

  • Fatigue and sleepiness are known side effects. Many patients report feeling unusually tired, sleepy, or low‑energy when they first start Zoloft or after a dose increase.
  • Often temporary, sometimes persistent. For most, this tiredness improves after a few weeks as the body adjusts, but a smaller group continues to feel fatigued longer term.
  • Not everyone gets tired. Clinical data and user reports show that while some feel exhausted, others feel more awake, productive, or even slightly “wired.”

Why Zoloft Can Make You Tired

  • Zoloft is an SSRI that increases serotonin, a chemical involved in mood and sleep regulation, which can shift sleep–wake patterns and cause fatigue or drowsiness.
  • In studies, fatigue/somnolence occurs in a noticeable minority of users (around 10–12%), and some also experience insomnia instead of sleepiness.

What People Are Saying Online

“Since starting Zoloft, I’ve found myself sleeping up to 16 hours a day… I feel like I’m missing out on so much.”

  • Some forum users describe extreme tiredness, long naps, and feeling like everything is a chore, especially in the first weeks.
  • Others on the same dose say they feel more motivated, energized, and “back to my old self,” showing how individual the response is.

How Long Does The Tiredness Last?

  • Many clinicians note that tiredness and other side effects often ease after the first 1–3 weeks as the body adjusts.
  • For some, fatigue can linger; in those cases, doctors may adjust timing (morning vs evening), tweak the dose, or consider another medication.

What You Can Do About It

If you are on Zoloft and feel wiped out:

  1. Talk to your prescriber. Never change your dose or stop suddenly on your own; your clinician can help distinguish a side effect from depression‑related fatigue or another medical issue.
  1. Ask about timing. Some people do better taking Zoloft in the evening if it makes them sleepy, while others need it in the morning if it feels activating.
  1. Track patterns for a couple of weeks. Note when you take the dose, when you feel most tired or alert, and any changes in sleep, so you can bring concrete info to your appointment.

Important: If fatigue is severe (you can’t stay awake, can’t function at work/school, or feel physically unsafe), or if you notice thoughts of self‑harm or your mood suddenly worsens, seek urgent medical help right away. This content is informational and not a substitute for professional medical advice.

Information gathered from public forums or data available on the internet and portrayed here.