Efficacy and tolerability of valsartan in combination with hydrochlorothiazide in essential hypertension

OBJECTIVE: This study compared the efficacy and tolerability of two combination regimens of valsartan and hydrochlorothiazide (HCTZ) with valsartan monotherapy in patients with essential hypertension inadequately controlled with valsartan 80mg once daily. PATIENTS AND METHODS: A total of 708 patients with inadequately controlled blood pressure after 4 weeks' treatment with valsartan 80mg once daily participated in this double-blind comparative trial. Patients were randomly allocated once-daily treatment with valsartan 80mg, valsartan 160mg, valsartan 80mg + HCTZ 12.5mg or valsartan 80mg + HCTZ 25mg for 8 weeks. RESULTS: Statistically significant decreases in mean sitting diastolic blood pressure (SDBP) and mean sitting systolic blood pressure (SSBP) from baseline were seen in all treatment groups (least squares mean change from baseline SDBP: -5.1mm Hg, -6.2mm Hg, -8.2mm Hg, -10.8mm Hg; SSBP: -3.9mm Hg, -6.5mm Hg, -9.8mm Hg, -16.0mm Hg for valsartan 80mg, valsartan 160mg, HCTZ 12.5mg combination, HCTZ 25mg combination, respectively). A significant difference for mean SDBP, SSBP and responder rates in favour of the combination regimens was observed compared with either valsartan monotherapy. All treatments were well tolerated with the percentage of patients reporting treatment-related adverse experiences at any time ranging from 9.9% (valsartan 160mg) to 21.0% (HCTZ 25mg combination). CONCLUSION: The study demonstrated that a combination of valsartan 80mg and HCTZ 12.5mg or 25mg provides an effective and well tolerated treatment in patients who need additional blood pressure control beyond valsartan monotherapy.