Any antidepressant can cause side-effects. You can scarfe yourself silly reading the leaflet that comes with your tablets, but that's just the drug companies covering themselves in absolutely every eventuality, most of which won't happen.
If you find you have any side-effects - nausea, loss of libido, and so on after about three weeks, then have a chat with your GP, but in nearly all cases, these effects, if they occur at all, subside after a short period of time.
Hope they help you.