Read More. I have been on citalopram 20 mg for five years; working great; over the past few months I have been having heart palpatations (ECG normal) and increased blood pressure; my physician increased the dose to 40 mg.Since this has been increased I feel awful and am still having the heart palps.ead More. I have been on citalopram 20 mg for five years; working great; over the past few months I have been having heart palpatations (ECG normal) and increased blood pressure; my physician increased the dose to 40 mg.