Cardiology and blood pressure related.

Hi, my father(age 63) went through a non emergency angioplasty -stent procedure 1 and half month back and recently before 1 week he suffered through a severe allergic reaction called Anaphylaxis where his blood pressure dropped to 90/60. On this day when he was having this allergic reaction he took concor cor 2.5 other than his regular heart medicines bcz he thought the reaction happened bcz he missed to take this medicine which was prescribed from his cardiologist to start after 1 month of stent procedure. Now his bp in hospital is coming 12/90 and at home monitoring machine it is coming as 140,150 . Can he start taking this medicine again as doctor suggested to start this with other ongoing medicine.