Antihypertensives Test Prep and Practice Pearls; Part 1 – ACEIs and CCBs

Welcome to today’s episode, where we dive into two cornerstone classes of antihypertensives: ACE inhibitors and calcium channel blockers. These drugs are among the most frequently prescribed agents in both primary care and specialty settings, making a solid understanding of their practical nuances essential for clinicians, pharmacists, and learners alike. In this episode, we’ll break down the most important clinical pearls that can immediately improve your prescribing confidence and patient care.

We’ll start with ACE inhibitors, a class often selected for patients with hypertension, heart failure, diabetes, and chronic kidney disease. While widely effective, ACE inhibitors come with monitoring requirements and predictable side effect profiles that clinicians must recognize early. We’ll highlight what changes in renal function are acceptable, how to navigate issues like hyperkalemia and cough, and when switching to an ARB may be the safest option.

Next, we’ll move into calcium channel blockers, emphasizing the differences between dihydropyridines and non-dihydropyridines—two groups with distinct effects and unique considerations. I outline amlodipine’s adverse effects and how to navigate a patient who is experiencing edema.

By the end of this episode, you’ll walk away with a set of high-yield, easy-to-apply pearls that you can use in your next patient encounter. If you use antihypertensives and treat hypertension, heart failure, arrhythmias, or chronic kidney disease, this episode will help sharpen your understanding of these foundational therapies and elevate your medication management strategies. Let’s get started.

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Nifedipine Pharmacology

Nifedipine is a dihydropyridine calcium channel blocker that selectively inhibits L-type calcium channels in vascular smooth muscle, leading to vasodilation and reduced peripheral vascular resistance.

The extended-release formulation of nifedipine provides more stable plasma concentrations and is preferred for chronic management of hypertension and angina.

Common adverse effects include headache, flushing, peripheral edema, and dizziness, all related to its vasodilatory action.

Nifedipine undergoes extensive first-pass metabolism in the liver, primarily via CYP3A4 enzymes, which significantly influences its bioavailability and potential drug interactions.

CYP3A4 inhibitors (e.g., ketoconazole, erythromycin, grapefruit juice) can increase plasma levels of nifedipine, raising the risk of hypotension and adverse effects.

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Amlodipine Pharmacology Podcast

On this episode of the Real Life Pharmacology Podcast, I discuss amlodipine pharmacology, adverse effects, and important drug interactions.

I break down why edema occurs with amlodipine on this episode of the Real Life Pharmacology podcast.

While beta-blockers are typically the first-line agent for the prevention of chronic angina symptoms, CCBs like amlodipine can be used as an alternative.

There are some potential CYP3A4 interactions with amlodipine. I discuss the severity of these interactions and how to monitor patients.

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Verapamil Pharmacology Podcast

On this episode, I discuss verapamil pharmacology, adverse effects, and important drug interactions.

There are numerous drug interactions to be aware of with verapamil as it inhibits the enzyme CYP3A4.

Verapamil is a calcium channel blocker (non-dihydropyridine) that blocks calcium channels in the heart and vessels.

In addition to hypotension and bradycardia, verapamil can cause constipation which may be more prominent in our geriatric patients.

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