Discontinuation of alpha-blockade after initial treatment with finasteride and doxazosin for bladder outlet obstruction.
OBJECTIVE
Patients with symptomatic bladder outlet obstruction and moderately enlarged prostates can receive durable relief from finasteride. However, the delayed onset of action has led many clinicians to prescribe an alpha-blocker in addition to finasteride early in therapy for more rapid symptom relief. Our goal was to determine when to discontinue the alpha-blocker in this group of patients.


METHODS
We enrolled 100 consecutive men with an estimated prostate size of >40 g and an AUA symptom score of > or =20, who reported an initially favorable response to combination therapy with 5 mg finasteride and 2 mg doxazosin daily. The average symptom score reduction at 1 month was 3.3. We discontinued the doxazosin at 3, 6, 9, or 12 months, while continuing finasteride, then reevaluated patients 1 month later to determine if the patients reported any worsening of symptoms.


RESULTS
Twenty-five patients discontinued doxazosin at 3 months. Five (20%) were successfully discontinued, reporting no change in symptom score. Twenty reported worsening symptoms. Twenty-five patients discontinued doxazosin at 6 months. Twelve (48%) were successfully discontinued, reporting no change in symptom scores. Thirteen (52%) reported worsening symptoms. Twenty-five patients discontinued doxazosin at 9 months. Twenty-one (84%) were successfully discontinued, reporting no change in symptom scores. Four (16%) reported worsening symptoms. Twenty-five patients discontinued doxazosin at 12 months. Twenty-one (84%) were successfully discontinued, reporting no change in symptom scores. Four (16%) reported worsening symptoms.


CONCLUSIONS
Patients with symptomatic bladder outlet obstruction and moderately enlarged prostates who are placed initially on combination therapy using finasteride and an alpha-blocker are likely to tolerate discontinuation of the alpha-blocker after 9 months of combination therapy.
Baldwin
K C
KC
Albert Einstein Medical Center, Philadelphia, PA, USA.
Ginsberg
P C
PC
Harkaway
R C
RC
D000317:Adrenergic alpha-Antagonists / Q000627:therapeutic use*; D017292:Doxazosin / Q000627:therapeutic use*; D004791:Enzyme Inhibitors / Q000627:therapeutic use*; D018120:Finasteride / Q000627:therapeutic use*; D006801:Humans; D008297:Male; D011470:Prostatic Hyperplasia / Q000150:complications* / Q000188:drug therapy*; D001748:Urinary Bladder Neck Obstruction / Q000188:drug therapy* / Q000209:etiology*
D000317:Adrenergic alpha-Antagonists; D004791:Enzyme Inhibitors; D018120:Finasteride; D017292:Doxazosin