Tyramine pressor response with moclobemide--a reversible monoamine oxidase inhibitor.
Moclobemide is a reversible, short-acting monoamine oxidase inhibitor (MAO1), specific for MAO A. To study moclobemide effects on the tyramine pressor response, we gave 12 depressed patients (2 males, 10 females; mean age 47, SD 11 years) an i.v. tyramine test after 7 days drug free. The mean (+/- SD) tyramine dose to raise systolic blood pressure 30 mmHg was 5.6 +/- 2.5 mg. Repeat tyramine testing after 2 weeks of treatment with moclobemide (280 +/- 90 mg/d) showed the tyramine dose required was reduced to 2.5 +/- 1.6 mg (n = 8). The mean (+/- SD) increase in sensitivity to tyramine was 2.9 +/- 1.8. Four patients did not have repeated tyramine tests as testing was discontinued because of tyramine-induced cardiac arrhythmias. Moclobemide seems an effective antidepressant with less tyramine sensitivity than MAOIs in current use.
Department of Psychiatry, University of Melbourne, Victoria, Australia.
J W
JW
Tiller
K P
KP
Maguire
B M
BM
Davies
D000328:Adult; D000928:Antidepressive Agents / Q000627:therapeutic use*; D001549:Benzamides / Q000009:adverse effects / Q000627:therapeutic use*; D001794:Blood Pressure / Q000187:drug effects*; D003866:Depressive Disorder / Q000188:drug therapy*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D020912:Moclobemide; D008996:Monoamine Oxidase Inhibitors / Q000009:adverse effects / Q000627:therapeutic use*; D014439:Tyramine
D000928:Antidepressive Agents; D001549:Benzamides; D008996:Monoamine Oxidase Inhibitors; D020912:Moclobemide; D014439:Tyramine