The most widely prescribed blood pressure medications fall into four drug classes that clinical guidelines recognize as first-line treatments: thiazide diuretics, calcium channel blockers, ACE inhibitors, and ARBs (angiotensin receptor blockers). Beta-blockers, once considered a go-to option, are now reserved for people with specific heart conditions. Within these classes, a handful of individual drugs dominate prescriptions. Here are the ten you’re most likely to encounter, how they work, and what to expect from each.
How First-Line Medications Are Chosen
The 2025 guidelines from the American Heart Association and American College of Cardiology are clear: four classes of medication have the strongest evidence for lowering blood pressure, preventing heart attacks and strokes, and being well-tolerated. Those four are thiazide-type diuretics, long-acting calcium channel blockers, ACE inhibitors, and ARBs. Everything else is considered secondary.
Your doctor picks from these classes based on your age, race, kidney function, other conditions you have, and how you respond to the first medication tried. Most people start on one drug and add a second if their numbers don’t come down enough.
ACE Inhibitors
1. Lisinopril
Lisinopril is one of the most commonly prescribed blood pressure drugs in the United States. It works by blocking an enzyme that produces a substance called angiotensin II, which narrows blood vessels. With less angiotensin II circulating, your blood vessels relax and your blood pressure drops. It also reduces a hormone called aldosterone that causes your body to retain salt and water.
The typical starting dose is 10 mg once a day, with most people landing in the 20 to 40 mg range. It’s taken once daily, which makes it simple to stick with. The most notable side effect across all ACE inhibitors is a persistent dry cough, which affects anywhere from a small fraction to roughly a quarter of users depending on the population studied. If the cough becomes bothersome, switching to an ARB usually resolves it.
2. Enalapril
Enalapril works through the same mechanism as lisinopril but is typically taken twice a day. It’s been used since the 1980s and has a long track record in treating both high blood pressure and heart failure. The same dry cough risk applies.
ARBs (Angiotensin Receptor Blockers)
3. Losartan
Losartan targets the same blood pressure system as ACE inhibitors but blocks it at a different point, which is why it rarely causes the cough that ACE inhibitors are known for. In studies, the cough rate with ARBs is no higher than with a placebo. The standard starting dose is 50 mg once a day.
One important interaction to know: losartan and other ARBs can raise potassium levels, so potassium supplements and potassium-containing salt substitutes should be used cautiously. Common anti-inflammatory painkillers like ibuprofen and naproxen can also blunt losartan’s effectiveness and increase the risk of kidney problems when used together.
4. Valsartan
Valsartan is another widely used ARB with a similar side effect profile to losartan. It’s frequently prescribed for people who need blood pressure control along with heart failure management. Like losartan, it carries the same cautions around potassium and anti-inflammatory painkillers.
Calcium Channel Blockers
5. Amlodipine
Amlodipine works by relaxing the muscles in blood vessel walls, allowing them to widen. It’s long-acting, taken once daily, and particularly effective in older adults and Black patients, populations where ACE inhibitors and ARBs sometimes produce a smaller blood pressure drop.
The main drawback is swelling in the ankles and feet. About 1 in 6 people taking amlodipine as their only blood pressure drug develop this peripheral edema. It’s not dangerous, but it can be uncomfortable enough to prompt a switch. The swelling tends to be worse at higher doses.
6. Nifedipine (Extended-Release)
Extended-release nifedipine belongs to the same class as amlodipine and works similarly. It holds a unique place as one of the preferred blood pressure medications during pregnancy, a situation where many other options are off-limits. ACE inhibitors, ARBs, and several other drug classes are strictly contraindicated in pregnancy because they can cause serious harm to the developing baby. Nifedipine and labetalol are the two first-line choices for pregnant women who need blood pressure treatment.
Thiazide Diuretics
7. Hydrochlorothiazide (HCTZ)
HCTZ is a “water pill” that lowers blood pressure by helping your kidneys flush out excess sodium and water. Less fluid in your bloodstream means less pressure on your artery walls. The typical starting dose is 12.5 to 25 mg daily, and doses rarely go above 50 mg.
The trade-off with HCTZ is its effect on electrolytes. It can lower potassium, sodium, and magnesium levels while raising calcium. Low potassium is the most common concern and can cause muscle cramps, weakness, and fatigue. Your doctor will likely check your blood work periodically, and you may be advised to eat potassium-rich foods or take a supplement.
8. Chlorthalidone
Chlorthalidone is a thiazide-type diuretic that lasts longer in the body than HCTZ, providing more consistent 24-hour blood pressure control. Many clinical trials that demonstrated the benefits of diuretics for blood pressure actually used chlorthalidone, which is why some guidelines favor it over HCTZ. It carries the same electrolyte risks.
Beta-Blockers
9. Metoprolol
Metoprolol slows the heart rate and reduces how hard the heart pumps, which lowers blood pressure. It comes in two forms that matter: metoprolol tartrate (immediate-release, taken two or three times a day) and metoprolol succinate (extended-release, taken once a day). The extended-release version is also approved for certain types of heart failure, while the immediate-release version is used after heart attacks to reduce the risk of death.
Current guidelines no longer recommend beta-blockers as a first choice for blood pressure alone. They were found to be less effective than the four first-line classes at preventing strokes and come with more side effects, including fatigue, cold hands, weight gain, and sexual dysfunction. They’re still commonly prescribed when someone also has heart failure, a history of heart attack, or certain irregular heart rhythms.
10. Labetalol
Labetalol is a beta-blocker that also relaxes blood vessels, giving it a dual mechanism. Its most important role is as a go-to blood pressure medication during pregnancy, where it’s considered first-line alongside extended-release nifedipine. It’s the only blood pressure drug with long-term safety data on infant outcomes (that distinction technically belongs to methyldopa, but labetalol is used more frequently in practice). The main group that should avoid labetalol is people with asthma or reactive airway disease, since it can trigger bronchospasm.
ACE Inhibitors vs. ARBs
These two classes are the most frequently compared because they target the same system in your body. The practical difference comes down to one side effect: the cough. ACE inhibitors cause a dry, persistent cough in a variable but sometimes substantial number of users, with rates reported anywhere from under 1% to 28% depending on the study. ARBs don’t carry this risk. If you start an ACE inhibitor like lisinopril and develop an annoying cough that won’t go away, your doctor will likely switch you to an ARB like losartan or valsartan.
Both classes raise potassium levels and should not be used together. Both are dangerous during pregnancy. In terms of blood pressure reduction and heart protection, they perform similarly.
When You Take It May Matter
A large study tracking about 19,000 people over six years found that taking blood pressure medication at bedtime instead of in the morning was associated with significantly better outcomes. People who took their pills before bed were 34% less likely to have a heart attack, 49% less likely to have a stroke, and 56% less likely to die from cardiovascular problems compared to morning dosers. The likely explanation is that high blood pressure during sleep appears to be more damaging to the heart and blood vessels than high daytime readings. Not every medication is suited to bedtime dosing, but it’s worth asking about.
Medications to Avoid During Pregnancy
If you’re pregnant or planning to become pregnant, this is one area where the rules are strict. ACE inhibitors and ARBs are contraindicated because they can cause birth defects and kidney problems in the developing baby. The safe options are extended-release nifedipine, labetalol, and methyldopa (an older drug that acts on the brain’s blood pressure control center). Methyldopa is the only blood pressure medication with long-term data on outcomes for children after birth, though nifedipine and labetalol are more commonly prescribed today.