Not , is not serious , don’t worry. If your BP drop to 150/100 mmHg from 210/140 mmHg, then is good thing and treatment start work, but first you must maintain strict diet as you have been advised by your Physician ( try reduce in your meals amount of salt, avoid coffee, black tea, smoking
, alcohol, excessive physical exercise, don’t work in hot environment, etc.. ) Second- continue medication as prescribed and monitor yourself or in medical center daily at same time , better morning for 5 days consecutively your BP and record your data. After that comeback to your Physician for review. Only monitoring carefully your BP during the treatment you can know sure if this treatment have positive effects.