Contemporary research on biofeedback as a treatment for essential hypertension by Greenhalgh et al. (2009)indicates that:

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Biofeedback has been studied as a treatment for essential hypertension, but research, including the study by Greenhalgh et al. (2009), has found it to be ineffective when compared to placebos, no treatment, and pharmacotherapy. This suggests that while biofeedback may have benefits for other conditions, it does not significantly lower blood pressure in patients with essential hypertension when compared to these other interventions.

Contemporary Research on Biofeedback as a Treatment for Essential Hypertension