Dear Pacman all I can say is to keep persevering. The drowsiness will lessen as the mirtazapine begins to kick in and your depression will start to lift. Do not interfere with the dosage I would stick with the 30mg that you have been given. This time I was started with 30mg but I had taken it previously. I am having a blip at the moment so considering going up to 45mg but the psychiatrist has suggested it. If you are not beginning to feel better after a month then that is the time to go back to your GP.