Howdy Adele, I think it takes longer than 3 days for the medication to kick in. I could be wrong but I think it takes more like 10-14 days. I went around in circles during the first 6 months I had panic disorder. I switched medcation a few times. Over the last 16 months though I've had the same 2 types of mediaction and have improved all the time. I think it does take a while for people to find the best medication for them. It's basically a case of trial and error. Panic disorder is hard at the start. Remember, panic attacks are distressing not dangerous. They always dissappear into thin air!!