Antihypertensive Medications

Focus: mechanism → assessment → safe administration → adverse effects → patient teaching → clinical judgment

Purpose: This guide expands the original medication notes into a high-yield study resource for early nursing students. It emphasizes concepts students should recognize in pharmacology, fundamentals, health assessment, and adult health courses. Medication administration should always follow the patient’s prescription, facility policy, and current drug reference.

1. Foundational Concepts You Should Know First

Blood pressure basics

• Blood pressure is influenced by cardiac output and systemic vascular resistance. A useful framework is: MAP ≈ CO × SVR.
• Cardiac output depends on heart rate and stroke volume. Antihypertensive drugs lower blood pressure by reducing vascular resistance, reducing cardiac workload/heart rate, reducing circulating volume, or combinations of these effects.
• Know the difference between systolic BP, diastolic BP, pulse pressure, and mean arterial pressure (MAP).
• For nursing care, trends are often more useful than a single isolated BP reading. Recheck unexpected values using correct technique and assess the patient.

Pharmacodynamics vs. pharmacokinetics review

• Pharmacodynamics = what the medication does to the body: receptor effects, physiologic response, therapeutic effects, and adverse effects.
• Pharmacokinetics = what the body does to the medication: absorption, distribution, metabolism, and excretion (ADME).
• For antihypertensives, nursing students should connect pharmacodynamics to assessment: for example, a drug that slows cardiac conduction may require assessment of heart rate, rhythm, and BP before administration.

Receptors and autonomic physiology

• Beta-1 receptors: primarily cardiac; stimulation increases heart rate and contractility and promotes renin release from the kidney.
• Beta-2 receptors: prominent in bronchial and vascular smooth muscle; stimulation promotes bronchodilation and selected vasodilatory effects.
• Alpha-1 receptors: vascular smooth muscle; stimulation promotes vasoconstriction and increased vascular resistance.
• Alpha-2 receptors: presynaptic/central sympathetic regulation; activation reduces norepinephrine release and sympathetic outflow.
• Agonist = activates/stimulates a receptor. Antagonist = blocks receptor activation.
• Vasodilation decreases vascular resistance; vasoconstriction increases vascular resistance.

2. High-Yield First-Line Hypertension Knowledge

For uncomplicated hypertension, current guidance identifies four major first-line medication classes: thiazide/thiazide-like diuretics, dihydropyridine calcium-channel blockers, ACE inhibitors, and ARBs. Beta-blockers are generally not first-line therapy for isolated hypertension but remain important when another indication is present, such as selected heart failure or ischemic heart disease.

• Know the four major first-line classes by class name and representative medication.
• Know that medication selection depends on comorbidities, kidney function, electrolytes, pregnancy status, age, adverse-effect risk, and the patient’s overall clinical situation.
• Do not memorize hypertension treatment as a single medication choice. Nursing students should learn to ask: What is the drug doing? What should I assess? What laboratory values matter? What adverse effect is dangerous? What should I teach?

3. Calcium Channel Blockers (CCBs)

Dihydropyridines (DHP)

• Examples: amlodipine, nifedipine, nicardipine.
• Common naming clue: many end in ‘-dipine.’
• Primary effect: vascular smooth-muscle relaxation → vasodilation → decreased systemic vascular resistance and BP.
• Amlodipine and other DHP CCBs are commonly used for hypertension. Nicardipine is frequently encountered in monitored inpatient/critical-care settings for BP control.
• Common adverse effects: hypotension, peripheral edema, flushing/headache, and sometimes reflex tachycardia.

Nondihydropyridines (NDHP)

• Main examples: verapamil and diltiazem.
• Have stronger effects on the heart than DHP agents: they slow AV-node conduction and can decrease heart rate and contractility.
• Common clinical uses include rate control for selected supraventricular arrhythmias, including atrial fibrillation.
• Important adverse effects: bradycardia, hypotension, and AV block.
• Use caution/avoidance in certain patients with significant systolic heart failure because of negative inotropic effects; follow the specific prescription and clinical context.

Nursing assessment for CCBs

• Check BP before administration and reassess response as appropriate.
• For verapamil/diltiazem, assess apical pulse/heart rate and rhythm and review the patient’s conduction history.
• Assess for dizziness, syncope, hypotension, and peripheral edema.
• Teach patients to report significant dizziness, fainting, or new/worsening swelling.

4. Beta-Adrenergic Blockers

• Common naming clue: many end in ‘-olol.’
• Beta-blockers reduce sympathetic effects on the cardiovascular system, commonly decreasing heart rate, contractility, and BP.
• Sympathetic response = “Fight” response, so the effects we see are the blockage of adrenaline
• Cardioselective examples: metoprolol, atenolol, nebivolol. Cardioselectivity is relative and can diminish at higher doses.
• Nonselective examples: propranolol. Labetalol and carvedilol have additional alpha-1 blocking activity.
• This equates to a more pronounced impact on BP for these medications
• Beta-blockers have important indications beyond hypertension, including selected patients with ischemic heart disease and heart failure.
• Very important for patients post-MI and for chronic management of heart failure

Key nursing concerns

• Assess heart rate, BP, and rhythm as appropriate before administration and follow ordered/facility-specific hold parameters.
• Adverse effects include bradycardia, hypotension, fatigue, dizziness, and conduction abnormalities.
• Beta-2 blockade can contribute to bronchospasm, so use particular caution in patients with asthma or reactive airway disease; cardioselective agents may be preferred when a beta-blocker is clinically necessary, but they are not completely free of pulmonary effects.
• Beta-blockers can blunt adrenergic warning signs of hypoglycemia such as tachycardia. They do not directly cause every episode of hypoglycemia simply by being given.

5. ACE Inhibitors (ACEIs)

• Naming clue: ‘-pril’ (examples: lisinopril, enalapril, captopril).
• Block conversion of angiotensin I to angiotensin II → less vasoconstriction and less aldosterone-mediated sodium/water retention.
• Important uses include hypertension, selected heart failure patients, and kidney-protective indications in appropriate patients with chronic kidney disease and diabetes.
• Important adverse effects: hypotension, hyperkalemia, increased creatinine/renal effects, persistent dry cough, and angioedema.
• ACE inhibitors are contraindicated during pregnancy because of fetal toxicity.

Nursing priorities

• Review BP and symptoms of hypotension.
• Know the patient’s potassium and renal function (BUN/creatinine/eGFR) when available.
• Recognize angioedema as a potentially life-threatening adverse effect. Swelling of the lips, tongue, face, or airway symptoms requires immediate clinical attention. Angioedema has no timeline for when it can occur. It could be 1 week or 10 years after initiation of medication, this is important to remember.
• Teach patients not to discontinue long-term therapy without discussing it with their clinician unless emergency instructions direct otherwise.
• If kidney function acutely worsens, the medication may need to be held or adjusted depending on the clinical situation; do not treat ‘AKI = automatically hold every ACEI’ as a universal nursing rule.

6. Angiotensin II Receptor Blockers (ARBs)

• Naming clue: ‘-sartan’ (examples: losartan, valsartan, candesartan).
• Block the effects of angiotensin II at the angiotensin II receptor, producing vasodilation and reduced aldosterone effects.
• Often used when an ACE inhibitor is not tolerated, particularly because ARBs are much less likely to cause the persistent ACE-inhibitor cough.
• Important adverse effects: hypotension, hyperkalemia, and changes in renal function. Angioedema is uncommon but possible.
• ARBs are contraindicated during pregnancy.

Safety connection: ACEI + ARB

• Routine combination of an ACE inhibitor with an ARB is avoided because dual renin-angiotensin-system blockade increases the risk of hyperkalemia, hypotension, and renal dysfunction without added benefit.

7. Diuretics

Diuretics increase renal sodium/water excretion. For early nursing education, focus on expected electrolyte changes, volume status, BP response, and patient teaching. Learning the locations where these medications work can assist you if you have a strong foundation of anatomy and physiology. For the purposes of most nursing exams at the undergraduate level however, location of effect is not generally tested for these medications.

Thiazide / thiazide-like diuretics

• Examples: hydrochlorothiazide, chlorthalidone, indapamide.
• Act primarily at the distal convoluted tubule and are important first-line agents for hypertension.
• Monitor BP, volume status, sodium, potassium, and renal function as clinically indicated.
• Can contribute to hyponatremia, hypokalemia, dehydration/orthostatic symptoms, and increased uric acid.

Loop diuretics

• Examples: furosemide, bumetanide, torsemide.
• Act in the thick ascending limb of the loop of Henle and produce potent diuresis.
• Common nursing concerns: hypokalemia, volume depletion, hypotension, and other electrolyte abnormalities.
• Rapid IV administration of some loop diuretics can increase ototoxicity risk; administer according to the specific medication’s current prescribing information and facility policy.

Potassium-sparing / aldosterone-antagonist diuretics

• Example: spironolactone.
• Promotes sodium/water excretion while reducing potassium loss.
• Major safety concern: hyperkalemia; monitor potassium and renal function.
• Spironolactone also has antiandrogenic effects and can cause gynecomastia and menstrual changes.

Diuretic nursing priorities

• Monitor BP, orthostatic symptoms, intake/output when clinically indicated, daily weight when ordered/appropriate, and electrolyte/renal laboratory results.
• Teach patients to follow prescribed fluid and sodium guidance rather than independently making large changes.
• When appropriate, schedule diuretics earlier in the day to reduce nighttime urination; follow the prescription and patient-specific plan.
• A rapid weight change can be clinically meaningful in patients being treated for fluid overload; interpret weight trends with the overall clinical picture.

8. Vasodilators

Hydralazine

• Direct arterial vasodilator used in selected hypertension situations rather than routine first-line therapy.
• Can cause hypotension, reflex tachycardia, headache, and fluid retention.
• Nursing focus: BP, heart rate, dizziness, and response to therapy.
• Clinical note: Hydralazine given through the IV push route is highly variable in effectiveness. Always give over instructed time frame and carefully monitor patient for appropriate response following.

9. Nitrates

• Examples: nitroglycerin and isosorbide mononitrate.
• Increase nitric-oxide signaling and primarily produce venodilation, reducing venous return (preload); nitroglycerin is commonly encountered in ischemic chest-pain management.
• Common adverse effects: headache, hypotension, dizziness, flushing, and orthostatic symptoms.
• Nursing students should recognize that nitrates are not simply ‘BP medicines’; their clinical purpose may be antianginal therapy or other hemodynamic management depending on the drug and setting.

Nitroprusside — recognize the concept

• Potent IV arterial and venous vasodilator used for closely monitored acute BP reduction in selected settings.
• Because of rapid onset and potentially serious toxicity, it is generally encountered in monitored/critical-care environments rather than routine oral-medication administration.
• Toxicity considerations include cyanide/thiocyanate accumulation, particularly with prolonged or high-dose therapy; monitoring follows institutional and prescribing guidance.

10. Alpha-1 Blockers

• Naming clue: ‘-zosin’ (examples: prazosin, doxazosin, terazosin).
• Block alpha-1 receptors → vasodilation → lower BP.
• Major nursing concern: orthostatic hypotension, dizziness, and falls, particularly after initiation or dose increases.
• Some alpha-1 blockers are also used for urinary symptoms related to benign prostatic hyperplasia.
• Do not assume every antihypertensive should be stopped abruptly; medication-specific instructions matter.

11. Nursing Assessment: What to Check Before and After an Antihypertensive

• Blood pressure: use appropriate cuff size, correct positioning, adequate rest, and repeat unexpected readings when appropriate. Always assess before administering any of these medications
• Heart rate/rhythm: especially important with beta-blockers and nondihydropyridine CCBs.
• Orthostatic symptoms/vital signs when indicated: dizziness, lightheadedness, or syncope can signal excessive BP reduction or volume depletion.
• Renal function: especially important with ACEIs, ARBs, and many diuretics.
• Electrolytes: potassium and sodium are particularly important with RAAS medications and diuretics.
• Volume status: edema, lung sounds, mucous membranes, intake/output, urine output, and weight may help identify fluid excess or depletion depending on the patient.
• Medication history: look for duplicate therapy, over-the-counter drugs, supplements, missed doses, and other agents that may alter BP or electrolytes.
• Clinical response: determine whether the medication achieved the intended therapeutic effect without causing hypotension or other adverse effects.

12. Patient Teaching: High-Yield Topics

• Take medications exactly as prescribed and ask before stopping them, particularly medications that affect cardiovascular or sympathetic function.
• Rise slowly from lying or sitting positions when a medication can cause orthostatic hypotension.
• Know which adverse effects are expected and which require urgent evaluation, such as severe dizziness/syncope, facial/tongue swelling, severe shortness of breath, or very slow heart rate when associated with symptoms.
• Keep a current medication list and bring it to appointments.
• Home BP monitoring can help confirm and manage hypertension when performed with validated equipment and correct technique.
• Lifestyle measures remain important: dietary patterns such as DASH, sodium reduction, physical activity, appropriate weight management, and limiting alcohol are components of evidence-based BP management.

13. Clinical Judgment Connections

• If BP is low and the patient is dizzy, do not focus only on the medication name. Assess the patient, recheck vital signs as appropriate, review recent medications/diuresis, and follow ordered hold parameters and escalation procedures.
• If a patient taking an ACEI develops lip/tongue swelling, recognize possible angioedema and prioritize airway assessment and urgent intervention.
• If a patient taking a diuretic becomes weak, confused, hypotensive, or develops an abnormal rhythm, consider volume and electrolyte disturbances and review laboratory data.
• If a patient taking metoprolol has marked bradycardia with symptoms, recognize the relationship between the medication’s pharmacologic effect and the patient’s assessment findings.
• If potassium is elevated in a patient taking an ACEI, ARB, or spironolactone, recognize the medication-laboratory connection and promptly communicate clinically significant findings.
• Always connect the medication to the reason it was prescribed. The same medication can have different indications and different monitoring priorities in different patients.

14. Quick Memorization Table

Class	Examples	Main Effect	Major Nursing Concern	High-Yield Clue
ACEI	Lisinopril	↓ Ang II → vasodilation	K+, renal function, cough, angioedema	-pril
ARB	Losartan	Blocks Ang II receptor	K+, renal function, hypotension	-sartan
DHP CCB	Amlodipine	Vasodilation	Edema, hypotension	-dipine
NDHP CCB	Diltiazem, verapamil	↓ HR/conduction	Bradycardia, AV block	Heart rate
Beta-blocker	Metoprolol	↓ HR/contractility	Bradycardia, hypotension	-olol
Thiazide	HCTZ, chlorthalidone	↑ Na+/water excretion	K+, Na+, volume status	DCT
Loop	Furosemide	Potent diuresis	K+, volume status	Loop of Henle
K-sparing	Spironolactone	Na+/water loss, K+ retention	Hyperkalemia	K+
Alpha-1 blocker	Prazosin	Vasodilation	Orthostatic hypotension/falls	-zosin
Direct vasodilator	Hydralazine	Arterial dilation	Hypotension/reflex tachycardia	Direct vessel effect

15. Academic References

• StatPearls. Antihypertensive Medications. NCBI Bookshelf. Updated 2026. https://www.ncbi.nlm.nih.gov/books/NBK554579/
• StatPearls. ACE Inhibitors. NCBI Bookshelf. Updated 2025. https://www.ncbi.nlm.nih.gov/books/NBK430896/
• StatPearls. Hypertensive Heart Disease. NCBI Bookshelf. https://www.ncbi.nlm.nih.gov/books/NBK539800/
• OpenStax. Pharmacology for Nurses, Chapter 18: Hypertension and Angina. Rice University. https://openstax.org/books/pharmacology/pages/18-introduction
• NCBI Bookshelf. Health Alterations, Chapter 5: Cardiovascular Alterations. https://www.ncbi.nlm.nih.gov/books/NBK613064/
• NCBI Bookshelf. InformedHealth.org: What medications are used to treat high blood pressure? Institute for Quality and Efficiency in Health Care (IQWiG). https://www.ncbi.nlm.nih.gov/books/NBK279230/

Educational note: This resource is intended for nursing education and does not replace course materials, a patient’s medication order, facility policy, a pharmacist, or a current medication reference. Medication-specific administration and monitoring requirements can vary by drug, formulation, dose, and clinical setting.