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Doxazosin Withdrawal and Ambulatory Blood Pressure Monitoring in Normotensive Subjects

Yutaka Takata

First Division of Internal Medicine, National Fukuoka Central Hospital, Fukuoka, Department of Internal Medicine, Kyushu Dental College, Kitakyushu, Second Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan

Takayuki Yoshizumi

First Division of Internal Medicine, National Fukuoka Central Hospital, Fukuoka

Yasuo Ito

First Division of Internal Medicine, National Fukuoka Central Hospital, Fukuoka

Yasuo Hirota

Department of Internal Medicine, Kyushu Dental College, Kitakyushu

Masatoshi Fujishima

Second Department of Internal Medicine, Faculty of Medicine, Kyushu University, Fukuoka, Japan

The effect of doxazosin withdrawal on normotensive subjects was examined by ambulatory blood pressure monitoring (ABPM) during twenty-four hours. Eight normotensive volunteers were treated with doxazosin for four weeks. ABPM was done the day before withdrawal and on the second and seventh days after withdrawal. The average systolic and diastolic BP were not altered by doxazosin withdrawal either on day 2 or day 7, but pulse rate (PR) decreased on day 2 and day 7. Daytime PR decreased on day 2, but both daytime and night time PR decreased on day 7. On withdrawal of doxazosin, the plasma nore pinephrine concentration decreased and the plasma renin activity tended to decrease. Neither overshooting hypertension nor cardiovascular event was re lated to doxazosin withdrawal was observed. It is concluded that, in normoten sive subjects, discontinuation of doxazosin may result in bradycardia without hypotension or signs of withdrawal syndrome.

Angiology, Vol. 45, No. 1, 17-23 (1994)
DOI: 10.1177/000331979404500103
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