Use of valsartan during pregnancy, especially after the first three months, can cause low blood pressure, kidney failure, too much potassium, or death in newborns. Additionally, when hydrochlorothiazide is used during pregnancy, it may cause jaundice, blood problems, and other side effects in the newborn baby. Therefore, it is important that you check with your doctor immediately if you think that you may be pregnant . It is not known whether valsartan passes into breast milk. However, it does pass into the milk of lactating rats.
Hydrochlorothiazide does pass into breast milk.
Be sure that you discuss this with your doctor if you decide to breast feed while taking these medicines. Studies on this medicine have been done only in adult patients, and there is no specific information comparing use of valsartan and hydrochlorothiazide combination in children with use in other age groups. Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. The presence of other medical problems may affect the use of valsartan and hydrochlorothiazide.