Do not continue taking the individual medications lisinopril and or hydrochlorothiazide after you start this medication. This medicine can infrequently raise or lower your potassium blood levels, which rarely can cause serious side effects such as muscle weakness cramping or very slow heartbeats. Lithium toxicity was usually reversible upon discontinuation of lithium and the ACE inhibitor. Hypokalemia may cause cardiac arrhythmia and may also sensitize or exaggerate the response of the heart to the toxic effects of digitalis eg, increased ventricular irritability. Important information Zestoretic Do not use Zestoretic if you are unable to urinate. Generic brands of buy zestoretic online generic buy zestoretic online buy discount prescription zestoretic buy cheap kaufen zestoretic online-bestellung zestoretic buy without prescription.