Nowadays my father is under stress and also he is having cough since 2 months ,chest x-ray, ecg,blood sugar are normal but Since 4-5 days his bp is rising , it's 150/98,sometimes it decreases sometimes it increases.. he always had normal bp but now doctor have prescribed him telmisatan for 5 days ..my question is should he take the medicines for life long ? Or he should discontinue after 5 days If bp comes to normal ???