What the numbers actually mean
A blood pressure reading is two numbers, written as a fraction. The top number is systolic pressure, the force on your arteries when the heart contracts. The bottom is diastolic pressure, the force when the heart rests between beats.
Current guidelines for adults define normal as under 120 over 80, elevated as 120 to 129 over under 80, stage 1 hypertension as 130 to 139 over 80 to 89, and stage 2 as 140 or above over 90 or above. A single high reading does not equal a diagnosis. A pattern of high readings, ideally measured at home over several days at consistent times, does.
Why Mississippi has it harder
Several drivers stack here. Obesity, diabetes, sleep apnea, and high sodium diets are all common across the Pine Belt. Family history of hypertension is widespread, particularly in African American populations, who develop hypertension earlier and at higher rates than other groups nationally and in Mississippi specifically. Access to consistent primary care is uneven. Many patients are first diagnosed at an emergency room or a free screening rather than in a planned wellness visit.
The five medication categories
ACE inhibitors and ARBs
Lisinopril, enalapril, ramipril (ACE inhibitors), and losartan, valsartan, telmisartan (ARBs) all work on the renin angiotensin system. They are particularly useful for patients with diabetes or kidney disease because they protect the kidneys in addition to lowering pressure. The most common ACE inhibitor side effect is a persistent dry cough, which affects about one in ten patients. If you have that cough, an ARB usually resolves it while providing similar benefits.
Calcium channel blockers
Amlodipine, nifedipine, diltiazem, verapamil. These relax the blood vessels and, in the case of diltiazem and verapamil, slow the heart rate. Amlodipine is the most commonly prescribed because it is once daily and well tolerated. Ankle swelling is the most common amlodipine side effect.
Thiazide diuretics
Hydrochlorothiazide and chlorthalidone reduce fluid volume in the blood vessels. They are inexpensive, well established, and often part of a combination tablet. Most patients see no major side effects. Some have mild changes in electrolytes that show up on routine blood work.
Beta blockers
Metoprolol, atenolol, carvedilol, bisoprolol. These slow the heart rate and reduce the force of contraction. They are not first line for blood pressure in patients without heart disease, but they are widely prescribed for patients who have had a heart attack or have heart failure.
Combination tablets
Many of the most useful blood pressure pills today combine two of the categories above into one tablet. Lisinopril plus hydrochlorothiazide, valsartan plus amlodipine, amlodipine plus benazepril. Fewer pills usually translates to better adherence, which translates to better blood pressure control.
The most common reasons blood pressure stays high on medication
- The patient is not taking the medication consistently. Even strong medications fail if they are taken three or four times a week instead of seven.
- The dose is too low. Many patients are started on a low dose to minimize side effects and never have it increased.
- The patient is on the wrong category for their physiology. Some patients respond much better to an ARB than to an ACE inhibitor, or much better to a diuretic than to a beta blocker.
- An interacting medication is fighting the BP drug. NSAIDs (ibuprofen, naproxen) and oral decongestants (pseudoephedrine, phenylephrine) commonly do this.
- Sodium intake is too high to overcome with medication alone.
- Untreated sleep apnea is driving pressure up overnight.
Where pharmacy helps
If your blood pressure is not where your doctor wants it, before you accept that you need an additional medication, ask your pharmacist for a full review. Free at Fairview, no appointment, no charge, and can usually be done the same day. We look at every medication and supplement you take, identify anything that may be working against your BP drug, and flag patterns that suggest the dose or the category should be revisited with your prescriber.
Serving Hattiesburg, the Pine Belt, Central Mississippi, and South Mississippi.
When to call a pharmacist
- Your home readings are consistently above 140 over 90 despite medication.
- You have a persistent dry cough that started after a new prescription.
- You are pregnant or planning pregnancy. Several BP medications are not appropriate in pregnancy.
- You take an over the counter pain reliever or decongestant regularly.
- You are picking up an OTC product and want to know if it interacts with your BP medication.
- You have stopped a medication on your own for any reason.
This article is for general information only and is not a substitute for personalized medical advice. Before starting or changing any medication, including over the counter products and supplements, talk with your pharmacist or physician about your specific situation.
References
- CDCHigh Blood PressurePublic health resource
- American Heart AssociationUnderstanding Blood Pressure ReadingsHealth information
