I've been on sertraline for 4 weeks now. 2 weeks at 50mg then cut down to half as side effects?

Are you seeing a GP or a psychiatrist? I was taking 25mg for a month, I felt better within 2 weeks. I tried to increase to 37.5mg but the exhaustion was unbearable, I couldn’t function. Side effects can last a month easily. So my doc lowered me back to 25mg (it’s been 3 months) & just added 150mg Wellbutrin. It seems to be a decent combo for me. It’s possible you need to give it more time. I’ve tried many antidepressants & Zoloft is the only one that’s worked for me, I’m very sensitive to all meds. But I do know if your doc wants to change your meds make sure you do it very slowly! Same thing with the dosages, some docs just want to increase or decrease too fast, I’ve lived through that before.