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Since you are 82 yrs then you may be suffering from what we call essential hypertension
that is hypertension coming with age.The tablet Repace 50 is Losartan potassium
a medicine belonging to ACE inhibitor
group and is used to control mild to moderate hypertension.Since your BP did not settle even after taking the medicine the other doctor has advised Telista H which is again from the same group with a added advantage of hydrochlorothaizide which is a mild diuretic
.You can presently start on Telista H as there was probably no good response to Repace 50.Then keep a watch and measure the BP regularly to see if proper control is achieved.