My dr increased remeron (mirtazapine) from 30mg to 45mg.i have head pressure since increase last monday.would this be a side effect. thanks?

Possibly: Definitely do tell your Dr about this symptom ASAP. It is worth the call.

Could be: Talk to prescribing doctor about lowering dose to 30 or 37.5 mg (½ of a 15 mg pill). If "head pressure" disappears, you know it's a med side effect. If feeling persists, discuss other possible causes with prescribing doc or see your pcp. Hope this helps.