On this podcast episode, I discuss quinapril pharmacology, adverse effects, drug interactions, pharmacokinetics, and much more.
Quinapril is a prodrug that is converted in the liver to its active metabolite, quinaprilat, which inhibits ACE, leading to decreased formation of angiotensin II and reduced aldosterone secretion.
Hyperkalemia can occur with quinapril use due to decreased aldosterone, leading to potassium retention—especially in patients with renal impairment.
Concomitant use of potassium-sparing diuretics or potassium supplements with quinapril increases the risk of hyperkalemia.
NSAIDs may reduce the antihypertensive effect of quinapril and increase the risk of nephrotoxicity, especially in patients with preexisting renal dysfunction.
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14:08
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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11:36
Clotrimazole Pharmacology
On this podcast episode, I discuss Clotrimazole pharmacology, adverse effects, indications, administration, and much more.
Clotrimazole is an imidazole antifungal that exerts its pharmacological effect by inhibiting the synthesis of ergosterol, an essential component of fungal cell membranes. This inhibition compromises membrane integrity, leading to leakage of cellular contents and ultimately fungal cell death.
Clotrimazole is primarily used topically due to poor systemic absorption when administered via the skin or mucous membranes, which limits systemic side effects.
When clotrimazole is used intravaginally or orally in lozenge form, localized concentrations are sufficient to treat mucocutaneous infections without significant systemic exposure.
Pay attention when clotrimazole is used frequently to treat Candida infections as corticosteroids, immunosuppression, and antibiotics may increase the risk of this type of infection.
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15:20
Irbesartan Pharmacology
Irbesartan is an angiotensin II receptor blocker (ARB) used primarily for the management of hypertension and diabetic nephropathy in type 2 diabetes.
It selectively inhibits the binding of angiotensin II to the AT1 receptor found in vascular smooth muscle and the adrenal gland. This blockade results in vasodilation, reduced aldosterone secretion, decreased sodium and water retention, and ultimately lower blood pressure.
Irbesartan is administered orally, with a typical starting dose of 150 mg once daily, which may be increased to 300 mg depending on the patient’s clinical response and tolerability.
Adverse effects of irbesartan are generally mild but can include hyperkalemia and dizziness. Hypotension may occur, especially in volume-depleted individuals or those on diuretics.
Routine monitoring of renal function and serum potassium is recommended, especially in patients with underlying kidney disease or those taking potassium-sparing agents or supplements.
Irbesartan is contraindicated in pregnancy due to the risk of fetal toxicity and should be discontinued as soon as pregnancy is detected.
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13:55
Benzonatate Pharmacology Podcast
On this episode, I discuss benzonatate pharmacology, adverse reactions, and much more.
Tessalon Pearls (benzonatate) are a non-narcotic antitussive commonly prescribed to relieve dry, non-productive coughs.
Benzonatate acts by numbing stretch receptors in the respiratory tract, lungs, and pleura, which helps suppress the cough reflex at its source. Unlike opioid-based cough suppressants, it doesn’t work in the brain’s cough center.
The usual adult dose is 100 to 200 mg taken orally three times a day as needed, with a maximum daily dose of 600 mg.
One of the most critical points is that the capsules must be swallowed whole. Chewing, sucking, or crushing them can cause numbness in the mouth and throat, leading to a risk of choking or aspiration.
There are no major drug interactions associated with benzonatate.
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