<s>[INST] My son is ten ans was put on 5 mg of lisinopril this afternoon..then later tonight a second doctor said not to give him anymore..Because his preasure was getting low.Now it is 98/56, when does it reach it peak of dropping preasure until it wares off?My email YYYY@YYYY [/INST] dear user, thanks for your query.from your history it is not clear why did first doctor start lisinopril. bye the way it is lowering pressure two much so i suggest decrease its dose to half and then measure blood pressure. if still blood pressure is low you may stop the drug.regards.- dr deepak </s>