Many antidepressants take a couple of weeks or even a month to achieve their full effects. It could vary some for different people because of the way they process the medicine. Some people may metabolize it very fast so it may take longer to achieve a good level. The time frame you report is within an expected range. Check with your doctor next time you want to get off- some antidepressants need to be tapered down in dose over time to avoid withdrawal symptoms or rebound depression. Hope this helps.