Hydrochlorothiazide may increase your risk of skin cancer. Avoid sunlight or tanning beds. Wear protective clothing and use sunscreen (SPF 30 or higher) when you are outdoors. Your doctor may want you to have skin examinations on a regular basis.
Do not use potassium supplements or salt substitutes, unless your doctor has told you to.
Drinking alcohol can further lower your blood pressure and may cause side effects.
Avoid driving or hazardous activity until you know how  hydrochlorothiazide and olmesartan will affect you. Your reactions could be impaired. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy.
