Do not take Irbesartan Hydrochlorothiazide Winthrop if you are allergic (hypersensitive) to irbesartan and hydrochlorothiazide, or any of the other ingredients of Irbesartan Hydrochlorothiazide Winthrop or to sulfonamide-derived medicines during the last 6 months of pregnancy, see section Pregnancy and breastfeeding if you are breast-feeding if you have severe liver or kidney problems if you have difficulty in producing urine if you have a condition which is associated with persistently high calcium or low potassium levels in your blood