Just wanted to see what symptoms others have experienced when the medication poops out (loses effectiveness). I have been on Sertraline 3 times in the last 10 years for anxiety. First 2 times on APOTEX generic Sertraline 50mg capsules for 8 months. Then 16 Months ago, onto my 3rd round and started on 50mg of generic again. After a year on generics I felt like I was getting different strengths every-time I re-upped my prescription and the last batch was really strong or bad so my doc switched me to Pfizer Zoloft which I have been on for 4 months now. The last 2 weeks of my 100 pill prescription (Zoloft) I felt my anxiety coming back, more frequent panic attacks, negative thoughts and feeling low. After I started the new prescription of 100 pills a few weeks ago, this didn't improve and started getting brain zaps and spent a few days dealing with a few of the startup symptoms again. When everything settled still no relief. Yesterday my doc gave me 25mg capsules to take everyday with the 50mgs so now I am on 75mgs daily. Last 2 days I've felt better but some increased anxiety which I know I will have to ensure for a week or so. Guess I will have to wait 2-6 weeks to adjust to the new dose to see if this is what I needed and if I need to increase again but in the meantime has anyone experienced this?