Cardiovascular Drugs Guide for Pharmacy Technicians

Cardiovascular Drugs Every Pharmacy Technician Should Know

Cardiovascular medications are among the most commonly dispensed drug classes in any pharmacy. Heart disease remains the leading cause of death in the United States, making these medications essential for patient care. As a pharmacy technician, having a strong working knowledge of cardiovascular drugs will help you perform your job effectively and succeed on the PTCB exam.

ACE Inhibitors

Angiotensin-converting enzyme (ACE) inhibitors are a cornerstone of hypertension and heart failure treatment. These medications work by blocking the enzyme that converts angiotensin I to angiotensin II, resulting in blood vessel relaxation and lower blood pressure.

Common ACE inhibitors include:

• Lisinopril (Prinivil, Zestril) - one of the most prescribed medications in America
• Enalapril (Vasotec)
• Ramipril (Altace)
• Benazepril (Lotensin)
• Captopril (Capoten)

A key identifier for ACE inhibitors is the "-pril" suffix. The most notable side effect is a persistent dry cough, which affects roughly 10-20% of patients. ACE inhibitors are contraindicated in pregnancy due to the risk of fetal harm.

ARBs (Angiotensin II Receptor Blockers)

ARBs work similarly to ACE inhibitors but block the angiotensin II receptor directly. They are often prescribed as alternatives for patients who develop a cough from ACE inhibitors. Common ARBs include losartan (Cozaar), valsartan (Diovan), and irbesartan (Avapro). The identifying suffix for ARBs is "-sartan."

Beta-Blockers

Beta-blockers reduce heart rate and blood pressure by blocking the effects of adrenaline on beta-adrenergic receptors. They are used to treat hypertension, heart failure, arrhythmias, and angina. Key beta-blockers include:

• Metoprolol (Lopressor, Toprol-XL) - available in tartrate and succinate forms
• Atenolol (Tenormin)
• Carvedilol (Coreg) - also blocks alpha receptors
• Propranolol (Inderal) - non-selective beta-blocker
• Bisoprolol (Zebeta)

The suffix "-olol" identifies most beta-blockers. Important counseling points include not stopping these medications abruptly, as this can cause rebound hypertension or cardiac events.

Calcium Channel Blockers

Calcium channel blockers (CCBs) prevent calcium from entering heart and blood vessel cells, causing relaxation and dilation. There are two main subtypes: dihydropyridines (like amlodipine and nifedipine) that primarily affect blood vessels, and non-dihydropyridines (like diltiazem and verapamil) that also slow heart rate.

Amlodipine (Norvasc) is one of the most commonly prescribed antihypertensives in the United States. A well-known side effect of dihydropyridine CCBs is peripheral edema, or swelling in the ankles and feet.

Diuretics

Diuretics help the body eliminate excess sodium and water, reducing blood volume and blood pressure. The three main classes are:

• Thiazide diuretics: hydrochlorothiazide (HCTZ), chlorthalidone
• Loop diuretics: furosemide (Lasix), bumetanide (Bumex), torsemide
• Potassium-sparing diuretics: spironolactone (Aldactone), triamterene, eplerenone

Thiazide and loop diuretics can cause hypokalemia (low potassium), while potassium-sparing diuretics can cause hyperkalemia (high potassium). Pharmacy technicians should be alert to potential interactions with potassium supplements.

Statins (HMG-CoA Reductase Inhibitors)

Statins lower cholesterol by inhibiting the enzyme HMG-CoA reductase in the liver. They are the most widely prescribed class of cholesterol-lowering drugs. Key statins include atorvastatin (Lipitor), rosuvastatin (Crestor), simvastatin (Zocor), and pravastatin (Pravachol). The "-statin" suffix makes them easy to identify.

Important considerations include monitoring for muscle pain (a sign of potential rhabdomyolysis) and taking certain statins in the evening when cholesterol production peaks.

Anticoagulants and Antiplatelets

Blood thinners prevent dangerous blood clots. Warfarin (Coumadin) is a traditional anticoagulant requiring regular INR monitoring. Newer direct oral anticoagulants (DOACs) like rivaroxaban (Xarelto), apixaban (Eliquis), and dabigatran (Pradaxa) have become increasingly popular because they require less monitoring.

Antiplatelet drugs like aspirin and clopidogrel (Plavix) prevent platelet aggregation and are commonly used after heart attacks and stent placement. Pharmacy technicians should understand that these medications increase bleeding risk and watch for potential drug interactions.

PTCB Exam Tips for Cardiovascular Drugs

For the PTCB exam, focus on memorizing generic and brand name pairs, identifying drug classes by their suffixes, understanding major side effects, and recognizing common drug interactions. Cardiovascular medications frequently appear on the exam because they represent such a large percentage of prescriptions filled in community and hospital pharmacies.