"my doctor prescribed mirtazapine to me after seeing him for depression, anxiety and sleeping problems since he through it would tackle all 3 problems with one prescription. i started with 15mg, then went to 30mg cause it wasn&#039;t enough and then to 45mg because 30 stopped working. 45mg and 30mg started giving me extreme anxiety and heart palpitations. i spent 3 months on mirtazapine and it was only good for the first month (which is reversed compared to others). im on cipralex (lexapro/escitalopram) for a week now and when i stopped the mirt., last night, my palpitations went away. i now see clearly that mirt. caused my anxiety to sky rocket and my heart to race uncontrollably. my pulse was about 96-100bpm daily, even at resting heart rate."