When I took it I only had 10mg and it made me very groggy. I would take it at night and sleep like a baby but I couldn't get out of bed til midday and was wondering around like the living dead all day. I was using it on top of another AD too but it just wasn't for me. Everyone is different and if you have been advised to stick with it a little longer do it but if you have any serious concerns with your dip in mood don't be afraid to go back to your gp and explain.