High Blood Pressure Treatment & Medications
Understanding how blood pressure medications work — and what to expect from each class — helps you take an active role in your treatment. Here's a plain-language guide to the medications your cardiologist may prescribe.
Important Safety Note
Never stop or change a blood pressure medication without talking to your doctor first — stopping some medications suddenly can be dangerous. This page is for education only and does not replace medical advice. If you have chest pain, trouble breathing, severe headache, or signs of a stroke, call 911 immediately.
How High Blood Pressure Is Treated
Treatment for high blood pressure (hypertension) always starts with lifestyle changes: reducing sodium, losing excess weight, exercising regularly, limiting alcohol, quitting smoking, and following a heart-healthy eating pattern such as the DASH diet. For some people, these changes alone bring blood pressure into a healthy range.
When lifestyle changes aren't enough — or when blood pressure is significantly elevated or cardiovascular risk is high — medications are added. For most adults, the treatment goal is a blood pressure below 130/80 mmHg. Your individual goal may differ based on your age, kidney function, and other health conditions, so ask your doctor what target is right for you.
There is no single "best" blood pressure medication. The right choice depends on your other medical conditions, kidney function, heart rate, and how you respond. It is common — and completely normal — to need more than one medication, or to adjust the plan over time.
Major Classes of Blood Pressure Medications
Thiazide Diuretics
Often called “water pills,” thiazide diuretics help your kidneys remove excess sodium and water from the body. This lowers the volume of fluid in your blood vessels and reduces blood pressure. They are one of the oldest and most proven medication classes and are frequently used as a first choice.
Common Examples
- •Hydrochlorothiazide (Microzide)
- •Chlorthalidone (Thalitone)
- •Indapamide (Lozol)
Common Side Effects
Increased urination (especially at first), low potassium or sodium levels, dizziness, increased uric acid (which can trigger gout in some people), and a modest effect on blood sugar. Your doctor may check blood tests periodically while you take these.
ACE Inhibitors
ACE (angiotensin-converting enzyme) inhibitors block the production of a hormone called angiotensin II, which normally tightens blood vessels. With less of this hormone, blood vessels relax and blood pressure falls. ACE inhibitors also help protect the kidneys and heart, which makes them especially useful for people with diabetes, kidney disease, or heart failure.
Common Examples
- •Lisinopril (Prinivil, Zestril)
- •Ramipril (Altace)
- •Enalapril (Vasotec)
Common Side Effects
A dry, persistent cough is the most common reason people switch off an ACE inhibitor. Other possible effects include dizziness, elevated potassium, and changes in kidney function. A rare but serious reaction called angioedema — swelling of the lips, tongue, or throat — requires emergency care. ACE inhibitors should not be used during pregnancy.
ARBs (Angiotensin Receptor Blockers)
ARBs work on the same hormone system as ACE inhibitors, but instead of blocking the production of angiotensin II, they block its ability to act on blood vessels. The result is similar — relaxed vessels and lower blood pressure — but ARBs rarely cause the dry cough seen with ACE inhibitors, so they are a common alternative.
Common Examples
- •Losartan (Cozaar)
- •Valsartan (Diovan)
- •Olmesartan (Benicar)
Common Side Effects
Generally well tolerated. Possible effects include dizziness, elevated potassium, and changes in kidney function. Like ACE inhibitors, ARBs should not be used during pregnancy, and the two classes are not combined with each other.
Calcium Channel Blockers
These medications reduce the movement of calcium into the muscle cells of the heart and blood vessel walls, which relaxes the vessels. The dihydropyridine type (such as amlodipine) mainly relaxes blood vessels, while the non-dihydropyridine type (diltiazem and verapamil) also slows the heart rate, which can be helpful for people who also have certain heart rhythm problems.
Common Examples
- •Amlodipine (Norvasc)
- •Diltiazem (Cardizem, Cartia)
- •Verapamil (Calan, Verelan)
Common Side Effects
Ankle and lower-leg swelling is the most common side effect of amlodipine and usually is not dangerous, though it can be bothersome. Other possible effects include flushing, headache, and dizziness. Diltiazem and verapamil can slow the heart rate and cause constipation (verapamil in particular).
Beta Blockers
Beta blockers slow the heart rate and reduce how forcefully the heart pumps, lowering blood pressure and the heart’s workload. They are not usually the first choice for blood pressure alone, but they are very important for people who also have coronary artery disease, a prior heart attack, heart failure, or certain rhythm problems.
Common Examples
- •Metoprolol (Lopressor, Toprol-XL)
- •Carvedilol (Coreg)
- •Bisoprolol (Zebeta)
Common Side Effects
Fatigue, slow heart rate, dizziness, cold hands and feet, and sometimes vivid dreams or reduced exercise tolerance. Beta blockers should never be stopped abruptly — doing so can cause a rebound rise in heart rate and blood pressure. Always taper under a doctor’s guidance.
Mineralocorticoid Receptor Antagonists
These medications block aldosterone, a hormone that causes the body to retain sodium and fluid. They are particularly effective as an add-on treatment for resistant hypertension — blood pressure that stays high despite several other medications — and are also used in heart failure.
Common Examples
- •Spironolactone (Aldactone)
- •Eplerenone (Inspra)
Common Side Effects
Elevated potassium is the main concern, so blood tests are monitored. Spironolactone can also cause breast tenderness or enlargement in men; eplerenone is less likely to do this.
Other Medications
Several additional medications are used in specific situations, usually when blood pressure remains high on standard therapy or when other classes are not tolerated. Hydralazine directly relaxes blood vessel walls. Clonidine works in the brain to calm the sympathetic (“fight or flight”) nervous system. Alpha blockers relax vessels and can also help men with prostate symptoms.
Common Examples
- •Hydralazine (Apresoline)
- •Clonidine (Catapres)
- •Doxazosin (Cardura), an alpha blocker
Common Side Effects
Hydralazine can cause headache and rapid heartbeat. Clonidine can cause drowsiness and dry mouth, and stopping it suddenly can cause dangerous rebound high blood pressure. Alpha blockers can cause dizziness when standing, especially after the first doses.
Combination Therapy & Sticking With Your Medications
Many people need two or more medications from different classes to reach their blood pressure goal. This is expected, not a failure — combining lower doses of two medications often controls blood pressure better, with fewer side effects, than a high dose of one. Many combinations are available as a single pill to make things simpler.
Blood pressure medications only work if you take them consistently. Tips that help:
For more strategies on organizing and safely managing your prescriptions, see our guide to medication management.
When Blood Pressure Stays High: Resistant Hypertension
If your blood pressure remains above goal despite taking three or more medications at optimal doses (including a diuretic), you may have resistant hypertension. This deserves a careful evaluation — sometimes there is an underlying cause such as sleep apnea, kidney disease, or a hormonal condition, and sometimes the medication regimen simply needs to be rebuilt. Adding spironolactone is often one of the most effective next steps.
For selected patients whose blood pressure remains uncontrolled despite medications, a minimally invasive procedure called renal denervation may be an option. It uses a catheter to calm overactive nerves around the kidney arteries that drive blood pressure up.
When to Call Your Doctor
Contact our office if you experience:
- Side effects that bother you or make you want to stop a medication
- Home blood pressure readings consistently above your goal despite taking medications as prescribed
- Dizziness, lightheadedness, or fainting — your blood pressure may be running too low
- A persistent dry cough after starting an ACE inhibitor
- New or worsening ankle swelling
- Any new medication, supplement, or over-the-counter drug you plan to start — some (like NSAIDs and decongestants) can raise blood pressure
Call 911 for swelling of the lips, tongue, or throat; chest pain; severe shortness of breath; sudden weakness or numbness; trouble speaking; or a severe headache with a blood pressure reading above 180/120 mmHg.
Key Numbers
- Treatment Goal (Most Adults)
- < 130/80 mmHg
- First-Line Treatment
- Lifestyle changes
- Needing 2+ Medications
- Common and expected
Seek Emergency Care
Call 911 for blood pressure above 180/120 mmHg with any of the following, or for swelling of the lips, tongue, or throat after taking a medication:
- • Severe headache
- • Chest pain
- • Vision changes
- • Difficulty breathing
- • Numbness or weakness
Questions About Your Medications?
Dr. Bleszynski can review your blood pressure regimen, address side effects, and build a plan that fits your life — including options for hard-to-control blood pressure.
Schedule Consultation(702) 805-5678