Hi, I am an 18-year old woman and today was my first day on a sertraline 50mg pill prescription for anxiety. I've heard friends who have tried sertraline talk about how strong the side effects were for the first few days/weeks and so I decided to only take half a 50mg pill the first day (expertly split using kitchen scissors.) ...Long story short, I had a major panic attack. I noticed my pupils were totally constricted no matter the lighting, I was feeling disoriented and freaking out. At some point, I decided to take a seat but instead of sitting on a chair, I ended up landing backwards into my elliptical bike a few inches away. My upper back took the majority of the impact and I don't know if it was the sertraline making me more expressive, but the fall made me cry out in pain in a way I had never done before. I carried on, though not for long before I lifted my right arm and felt it weaker than my left.