SN instructed patient / caregiver on medication Hydrochlorothiazide. SN explained to patient that Hydrochlorothiazide ( HCTZ ) is a medication indicated for edema and hypertension. SN explained to patient / caregiver that it is a diuretic that reduces fluid volume overload which, in turn, lowers blood pressure. Explained that side effects of this medication includes dizziness, dehydration, weakness, pancreatitis, anemia and nausea. SN instructed patient / caregiver to notify physician ( MD ) if experiencing persistence or worsening of side effects.