Calcium channel blockers drugs

What drug suffix identifies calcium channel blockers (CCBs)?

There is no single suffix, but most end in -dipine (dihydropyridines). Verapamil and diltiazem are important exceptions.

What are the two major classes of calcium channel blockers?

Dihydropyridines (mainly affect blood vessels) and non-dihydropyridines (mainly affect the heart).

What are the most commonly tested dihydropyridine calcium channel blockers?

Amlodipine, nifedipine, nicardipine, felodipine.

What are the most commonly tested non-dihydropyridine calcium channel blockers?

Verapamil and diltiazem.

Are calcium channel blockers considered high-alert medications?

No, but they require close monitoring because they can cause hypotension, bradycardia, heart block, and worsening heart failure.

What are the common routes of calcium channel blockers?

Primarily PO (oral)

What body system do calcium channel blockers primarily affect?

The cardiovascular system.

What are calcium channel blockers primarily used for?

Hypertension, angina, dysrhythmias, and some forms of coronary artery disease.

Why are calcium channel blockers prescribed for hypertension?

They relax blood vessels, lowering blood pressure.

Why are calcium channel blockers used for angina?

They decrease the heart's workload and improve blood flow to the heart muscle.

Which calcium channel blockers are commonly used to treat dysrhythmias?

Verapamil and diltiazem.

Which calcium channel blockers are commonly used for hypertension?

Amlodipine and nifedipine.

What is the mechanism of action of calcium channel blockers?

They block calcium from entering cardiac and smooth muscle cells, causing relaxation of blood vessels and decreased cardiac workload.

How do calcium channel blockers lower blood pressure?

They relax vascular smooth muscle, causing vasodilation and decreased peripheral resistance.

How do non-dihydropyridine calcium channel blockers affect the heart?

They decrease heart rate, decrease contractility, and slow AV node conduction.

How do dihydropyridine calcium channel blockers primarily work?

They mainly relax blood vessels with minimal effect on heart rate.

What is an easy way to remember the mechanism of calcium channel blockers?

Less calcium enters the muscles, so the heart pumps less forcefully and the blood vessels relax.

When are calcium channel blockers contraindicated?

Severe hypotension, cardiogenic shock, second- or third-degree heart block (without a pacemaker), and hypersensitivity.

Why should verapamil and diltiazem be used cautiously in patients with heart failure?

They can weaken heart contractions and worsen heart failure.

Why should calcium channel blockers be used cautiously in patients with bradycardia?

They can further slow the heart rate.

Why should beta blockers and non-dihydropyridine calcium channel blockers be used cautiously together?

The combination increases the risk of severe bradycardia and heart block.

What are the common side effects of calcium channel blockers?

Hypotension, dizziness, headache, flushing, peripheral edema, and fatigue.

What side effect is commonly associated with amlodipine?

Peripheral edema (swelling of the ankles and feet).

What side effect is commonly associated with verapamil?

Constipation.

What serious side effects can calcium channel blockers cause?

Bradycardia, heart block, worsening heart failure, and severe hypotension.

Which side effects require immediate medical attention?

Chest pain, fainting, severe dizziness, very slow heart rate, difficulty breathing, or worsening swelling.

What should the nurse assess before administering a calcium channel blocker?

Blood pressure, apical pulse for one full minute, heart rhythm, and signs of heart failure.

When should the nurse hold a non-dihydropyridine calcium channel blocker?

If the heart rate or blood pressure is below the provider's prescribed parameters.

What should the nurse monitor while a patient is taking a calcium channel blocker?

Blood pressure, heart rate, ECG (if indicated), peripheral edema, and signs of heart failure.

Why should the nurse monitor for swelling in patients taking amlodipine?

Peripheral edema is a common side effect.

Why should the nurse monitor bowel function in patients taking verapamil?

Constipation is a common adverse effect.

What should patients be taught about taking calcium channel blockers?

Take the medication exactly as prescribed and do not stop it without consulting the provider.

What should patients be taught about changing positions while taking calcium channel blockers?

Rise slowly to reduce the risk of orthostatic hypotension.

What food should many patients avoid while taking calcium channel blockers?

Grapefruit or grapefruit juice unless the provider says it is safe, because it can increase drug levels.

What symptoms should patients report immediately while taking calcium channel blockers?

Chest pain, fainting, severe dizziness, shortness of breath, or swelling that worsens.

How can patients help reduce ankle swelling while taking amlodipine?

Elevate the legs when sitting and notify the provider if swelling becomes severe or sudden.

What drug suffix is commonly associated with dihydropyridine calcium channel blockers?

-dipine.

What are the two most commonly tested non-dihydropyridine calcium channel blockers?

Verapamil and diltiazem.

What assessment must always be completed before administering verapamil or diltiazem?

Assess the apical pulse for one full minute and blood pressure.

What is the hallmark side effect of amlodipine?

Peripheral edema.

What is the hallmark side effect of verapamil?

Constipation.

Which calcium channel blockers significantly lower heart rate?

Verapamil and diltiazem.

Which calcium channel blockers primarily lower blood pressure by relaxing blood vessels?

Amlodipine and other dihydropyridines.

Why should grapefruit juice be avoided with many calcium channel blockers?

It can increase drug levels and the risk of adverse effects.

What is the difference between dihydropyridine and non-dihydropyridine calcium channel blockers?

Dihydropyridines (such as amlodipine) primarily relax blood vessels, whereas non-dihydropyridines (verapamil and diltiazem) primarily slow the heart.

What is the difference between amlodipine and verapamil?

Amlodipine mainly lowers blood pressure by vasodilation, whereas verapamil lowers heart rate, slows AV conduction, and decreases heart contractility.

What is the difference between beta blockers and non-dihydropyridine calcium channel blockers?

Both lower heart rate and blood pressure, but beta blockers block beta receptors, whereas verapamil and diltiazem block calcium channels.

Why should beta blockers and verapamil or diltiazem be used cautiously together?

They can cause excessive bradycardia, heart block, and hypotension.