Some people take three blood pressure medicines faithfully and still see numbers above goal. It is frustrating, and it can feel as if nothing works. Often something specific is driving it, and finding that cause is usually more useful than simply adding another pill.

What counts as resistant

The 2025 AHA/ACC blood pressure guideline defines resistant hypertension as blood pressure above goal despite three medicines with complementary actions, including a diuretic, at the highest doses a person tolerates. People whose pressure is at goal but who need four or more medicines to get there also count. The American Heart Association’s 2018 scientific statement describes the usual three as a long-acting calcium channel blocker, an ACE inhibitor or ARB, and a diuretic.

It matters because, as the AHA statement notes, resistant hypertension carries a higher risk of harmful outcomes than blood pressure that responds to treatment. It is also a group in which a specific, treatable cause is more common.

First, rule out apparent resistance

Before calling blood pressure resistant, the guideline asks doctors to rule out “pseudoresistance,” readings that only look resistant. Its list includes:

  • Measurement errors, such as a cuff that is too small or readings taken without rest
  • A white coat effect, high in the office but controlled at home, ruled out with home or ambulatory monitoring
  • Missed doses, which are common and nothing to be embarrassed about, especially with complex schedules
  • Interfering medicines and substances

Our articles on white coat and masked hypertension and home blood pressure monitoring cover the first two. For missed doses, the guideline notes that single-pill combinations, two medicines in one tablet, improve adherence.

Interfering medicines are worth a careful look. MedlinePlus lists many that can raise blood pressure, including NSAID pain relievers, nasal decongestants and some cough and cold products, corticosteroids, estrogens, some antidepressants, alcohol, caffeine, nicotine and black licorice. KDIGO also links NSAIDs to high blood pressure. Bring every product you take, including supplements, to your next visit. Our article on salt, sodium and blood pressure explains why diet is a real part of treatment.

Look for a hidden cause

Resistant hypertension is one of the main reasons to look for secondary hypertension, high blood pressure driven by another condition. The 2025 guideline highlights several:

  • Primary aldosteronism. The adrenal glands make too much aldosterone, which holds on to salt. The guideline estimates it is present in about 20 to 35 percent of people with resistant hypertension, yet fewer than 2 percent of eligible patients in the US are screened. It now recommends screening everyone with resistant hypertension, whether or not potassium is low, with a simple aldosterone and renin blood test.
  • Obstructive sleep apnea. Snoring, gasping at night and daytime sleepiness are clues. The guideline lists resistant hypertension among the reasons to test for it.
  • Kidney disease and narrowed kidney arteries. Kidney function and urine albumin should be checked, since kidney disease both causes and results from high blood pressure.
  • Less common hormone causes, such as thyroid problems, which the guideline also lists for testing in the right setting.

Finding primary aldosteronism can change treatment, since the guideline names aldosterone-blocking medicines as preferred agents for it.

Treatment options when blood pressure stays high

Once true resistant hypertension is confirmed, the guideline and the AHA statement describe a stepwise approach:

  • Lifestyle, in earnest. Lower sodium, weight loss if needed, regular activity and limited alcohol all add up.
  • Optimize the diuretic. The AHA statement favors long-acting thiazide-like diuretics such as chlorthalidone or indapamide.
  • Add spironolactone. In the PATHWAY-2 trial, spironolactone lowered home systolic blood pressure more than placebo or two other add-on drugs. The 2025 guideline recommends it as the fourth medicine for people with an eGFR of 45 or higher, with potassium and kidney function monitored.
  • Newer options. The guideline describes aprocitentan, a once-daily medicine approved as add-on therapy, and renal denervation, a catheter procedure, as additional options for selected patients. It cautions that renal denervation is not a cure or a replacement for medicine and should be considered by a team experienced in resistant hypertension.

If blood pressure remains uncontrolled, the AHA statement advises referral to a hypertension specialist.

Call your doctor if your home readings stay above goal on three medicines, or if you notice dizziness on standing after a dose change. If a reading above 180/120 comes with chest pain, shortness of breath, back pain, numbness, weakness, a change in vision or difficulty speaking, the American Heart Association says to call 911.

Hypertension is a core part of Nephrology, and Dr. Yana Shtern is board-certified in Internal Medicine and Nephrology. She looks for kidney, hormone and medication causes that are easy to miss, and members can reach her directly when a dose needs adjusting. You can read more on our hypertension page. A complimentary meet and greet with Dr. Shtern is a good first step; bring your medication list and a week of home readings.

This article is general information, not advice for your situation. Members can call the office with questions about their own care.