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  • Title: The long-term antihypertensive activity and tolerability of irbesartan with hydrochlorothiazide.
    Author: Raskin P, Guthrie R, Flack J, Reeves R, Saini R.
    Journal: J Hum Hypertens; 1999 Oct; 13(10):683-7. PubMed ID: 10516738.
    Abstract:
    The long-term safety, tolerability, and antihypertensive effects of irbesartan/hydrochlorothiazide (HCTZ) were assessed in hypertensive patients (seated diastolic blood pressure [SeDBP] 95-110 mm Hg). Patients (n = 1098) completing two randomised, double-blind trials of irbesartan alone, HCTZ alone, irbesartan/HCTZ combinations, or placebo, took 1 year of open-label therapy starting with irbesartan 75 mg/HCTZ 12.5 mg once daily. If target blood pressure (BP) (<140/<90 mm Hg) was not achieved, the dose was titrated sequentially at 2- to 4-week intervals to irbesartan 150 mg/HCTZ 12. 5 mg, then to irbesartan 300 mg/HCTZ 25 mg. If necessary, adjunctive therapies were added. Mean changes in trough seated systolic BP/SeDBP at months 2, 6, and 12 were -19.1/-14.2 mm Hg (n = 941), -20.7/ -15.7 mm Hg (n = 948), and -20.6/-15.6 mm Hg (n = 898), respectively. From months 2 to 12, normalisation rates (trough SeDBP <90 mm Hg) ranged from 75-85% and total responder rates (normalised or >/=10 mm Hg trough SeDBP reduction) ranged from 81-91%, while target BP was achieved in 65-75% of patients. At all time-points, most patients (>/=87%) were receiving irbesartan/HCTZ alone. Eighty-two patients (7.5%) discontinued the study due to adverse events, with half of these events considered unrelated to study medication. There were no reports of serious adverse events related to study medication. Long-term therapy with irbesartan/HCTZ is safe, well tolerated, and maintains normalised BP in >80% of patients.
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