Blood Pressure and Altitude Affects

I'm 53, until a month ago my BP averaged in the 130/80 range I was working at an about 600 feet above sea level, now I'm working overseas at an altitude of 3800 ft and my BP is now averaging upper 140's/90 range, and has hit 154/94. The local physician has started me on Lisinopril 20mg, after one week no change in BP. How much does altitude affect BP, and will my body  acclimate to a point that my BP goes back down, or am I destined to stay on medication?

[ed34]

The body does adapt to altitude change and this takes a different amount of time in individuals. Some adapt very quickly, just a few days, some take weeks. With the air being thinner, blood pressure will be affected because you have to basically pump blood around quicker to obtain the same oxygen supply to all your living cells. How is your breathing? any dizziness?