Is weight gain a side affect? A: Hyzaar is a combination of losartan and hydrochlorothiazide.A: Yes, dry cough is a side effect for Hyzaar HCT (losartan-HCTZ). Hyzaar HCT ( losartan-HCTZ) treats high blood pressure by decreasing fluid retention and increasing blood flow. canadian-pharmacyv.com original viagra online