I took Zoloft for a year and It made me not care that's for sure. But It took away my sex drive. Mine was low to begin with but It's been a year since I've been off and I'm just now getting my groove back.

It works for me now that I cut it in half

I have taken Zoloft for about 2 years and just recently got switched to Prozac to try to help me not feel so down. I asked my Doctor if it's normal for people to change medication and he says yes it's just like booze or anything else. you build up a tolerance to it and it may not work like you are wanting it to or like it has in the past.
Just talk to your doctor and see what they have to say.

I was prescribed Zoloft by my neurologist who I go to since he knows my health issues and he gives me my other med's

I was on zoloft for 15 years before I was finally put on something else when I found the right psychiatrist.