My dad is 86 he takes Metoprolol tartrate 100 mg 1x day in am. Losartan Potassium 50 1x day am. Hydra lazing HCL 25 mg 2 x a day am and 6 pm. I was giving my brother and my dad their blood pressure meds and gave my dad my brother blood pressure pill by accident and it wasLisinopril 40 mg. Will there be a problem and bring my Dads Blood pressure to low? His number was 185/87 20 minutes after he took the wrong one?