Hmmm...let me think. I was on 5 mg for 4 days and then 10 for 2 weeks maybe? My anxiety was getting better at that point, but the 10 mg. was awful. When I went down to 5 mg. I had an initial increase in my anxiety, but felt ok again in 2-3 days. So, it's hard to tell how long the 5 mg. took to work because I had been on 10 mg. However, on the 10 mg. I felt better within 7 days!