Hi Greyhaze 45mg is usually the maximum dose for mirtazapine although I have known people who are on more. For me it is an 'add on' for the lithium I already take. The mirtazapine makes the lithium work better. I think that you need to chat to your GP about your medication. An increase shouldn't make you feel more drowsy as the drowsiness is usually felt in the lower doses. We are all different however. If it is useful in sleep then the doctor might keep you on 30mg and try something else. I hope it works out for you.