Hi, I am sorry for the health situation your friend is going through. High blood pressure could be life threatening if not managed well and in time. The very first thing is to measure his blood pressure (bp) and record the results. So, we can understand its fluctuations and take proper measures. We should identify what is causing his bp to get high. Limitation in salt intake is recommended together with managing stress. Chamomile tea can help. However, you cannot do much at home. If his bp is high, should consult with his physician as diagnostic tests should be undergone to determine the cause and advise proper treatment strategy. Hope this helps.