IS very risky if he has a big flutuation /Change in BP over diference of 50/22
IS better to seek help from a physician to stabalized his BP With a Big up/and down men is being high risk to Stroke and other internal organ damage in a short span of time.
There are so many more medications available for high BP and if a class not suitable the DR will know what to do next but he must go back to the DR and let the DR knows.
PM me I Love to find out about anybody's Medications + Side Effects + Cost : )