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Some hypertensives are referred to as resistant, that is the blood pressure is not controlled on 3 or more medications. Some persons may appear resistant but the high readings may be due to problems such as small cuff when checking the blood pressure, white coat hypertension (blood pressure goes up in doctor's office) , problems taking medication.
Normally when a person is assessed as having true resistant hypertension
then the following can be done: (1) your doctor may consider increasing the dosage of the medication to the maximum dosage provided you do not have any problems with that (2) consider switching one of the three from morning to bedtime (3) adding additional medication
I hope this helps