What activities should I avoid while taking hydrochlorothiazide?

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Avoid breastfeeding until you've talked to your doctor about the risks to your nursing infant associated with your taking hydrochlorothiazide (HCTZ). It is also important to avoid drinking alcohol. It can increase the severity of side effects associated with HCTZ, including dizziness and blurred vision. Do not drive until you know how this diuretic will affect you. You may have to avoid certain activities that cause you to become overheated and thirsty so that you will not dehydrate. HCTZ can increase your sensitivity to the effects of the sun so use sunscreen and stay in the shade.