High Blood Pressure (BP) : How to bring it down?

So, for 75 years old female, who has been facing high BP in the range of 120-180, what could be the ways to bring it down?

The person takes mucusless diet, taking Dr. Christopher's blood stream and blood circulation formulas. While these formulas have been of great help in the past, since the last one week, the BP has increased to 120-180 and these formulas have been unable to bring down the BP. She also takes Arjunarishta (Ayurveda based), which helped in the past, though has not been helping now. Whenever the BP is high, she feels nausea a lot.

Suggestions about both short term measures to bring it down and the long term measures would help.

She does have hypothyroid and Dr. Christopher's Herbal thyroid formula is of great help in this.

Thanks for your help.
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