Real Life Pharmacology - Pharmacology Education for Health Care Professionals

Glycopyrrolate is an anticholinergic medication commonly used to reduce excessive secretions, particularly in palliative care, postoperative settings, and certain neurologic conditions. It works by blocking acetylcholine at muscarinic receptors, which decreases salivary and respiratory secretions. Clinically, glycopyrrolate is often used to manage terminal respiratory secretions (“death rattle”). Adverse effects of glycopyrrolate are primarily related to its anticholinergic properties. These may include dry mouth, constipation, urinary retention, blurred vision, tachycardia, and decreased sweating. While it has fewer central effects than agents like scopolamine, caution is still warranted in patients with glaucoma, gastrointestinal obstruction, or significant urinary retention risk. Monitoring hydration and bowe...

Bisacodyl, commonly known by the brand name Dulcolax, is a stimulant laxative widely used for short-term relief of constipation and bowel preparation before procedures. It works by directly stimulating the enteric nerves in the colon, increasing peristalsis, and promoting bowel evacuation. Mechanism of Action:Bisacodyl acts primarily on the large intestine. It stimulates intestinal smooth muscle and alters water and electrolyte transport, increasing fluid accumulation in the bowel and triggering defecation. The result is a bowel movement typically within 6–12 hours orally or within 15–60 minutes when given rectally. Dosage Forms and Dosing:Bisacodyl is available as oral tablets (5 mg) and rectal supp...

On this podcast episode, I cover fludrocortisone. Fludrocortisone is a synthetic corticosteroid with potent mineralocorticoid activity and minimal glucocorticoid effects. It works primarily by promoting sodium reabsorption and potassium excretion in the distal renal tubules, leading to increased water retention and expansion of extracellular fluid volume. This pharmacologic action helps maintain blood pressure and electrolyte balance. Fludrocortisone is most commonly indicated for the treatment of adrenocortical insufficiency, such as Addison’s disease, and for managing orthostatic hypotension by enhancing vascular tone and volume status. Adverse effects are typically related to its mineralocorticoid potency and may include hypertension, edema, hypokalemia, and we...

One of the most important yet often overlooked concepts in pharmacology is the prescribing cascade. It occurs when a new medication is prescribed to treat a side effect caused by another drug, without realizing that the first medication is the root cause. This leads to a chain reaction of additional prescriptions, unnecessary complexity, and often, new adverse effects. Prescribing cascades can sneak up on even the most careful clinicians. A patient develops a new symptom after starting a medication—perhaps swelling, dizziness, or urinary changes—and instead of identifying the drug as the culprit, another medication is added to manage the...

Airsupra is a combination inhaler that contains albuterol and budesonide, approved for as-needed use in adults with asthma. It represents the first rescue inhaler to combine a short-acting beta-2 agonist (SABA) with an inhaled corticosteroid (ICS) in a single device. The albuterol component provides rapid bronchodilation by relaxing airway smooth muscle, while budesonide works to reduce airway inflammation and mucus production. This dual mechanism allows Airsupra to not only relieve acute bronchoconstriction but also address the underlying inflammatory process that contributes to asthma exacerbations. Clinically, Airsupra is indicated for as-needed treatment or prevention of bronchoconstriction in adults with asthma, but...

In this episode of Real Life Pharmacology, we take a deep dive into daptomycin, a lipopeptide antibiotic primarily used for serious Gram-positive infections, including MRSA and VRE. Daptomycin works by binding to bacterial cell membranes in a calcium-dependent manner, causing rapid depolarization and cell death. One key limitation is that daptomycin should never be used for pneumonia because pulmonary surfactant inactivates the drug. Clinically, it’s often reserved for bacteremia, endocarditis, or complicated skin and soft tissue infections. From a pharmacokinetic standpoint, daptomycin is given intravenously and primarily eliminated unchanged by the kidneys, so dose adjustments are necessary in renal im...

Cefepime is a fourth-generation cephalosporin antibiotic with broad-spectrum activity against both gram-positive and gram-negative organisms, including Pseudomonas aeruginosa. It works by inhibiting bacterial cell wall synthesis through binding to penicillin-binding proteins, leading to cell lysis and death. Clinically, cefepime is commonly used in hospital settings for serious infections such as pneumonia, febrile neutropenia, urinary tract infections, skin infections, and intra-abdominal infections. It’s typically administered intravenously, with doses often ranging from 1 to 2 grams every 8 to 12 hours depending on the indication and renal function. From a pharmacokinetic standpoint, cefepime is primarily renally eliminated, so dose adjustments are required in patients with im...

Midodrine is an oral alpha-1 agonist most commonly used for the treatment of symptomatic orthostatic hypotension. Its mechanism of action is through peripheral vasoconstriction, which helps increase blood pressure. Because of its short duration of action, it is typically dosed three times daily, with the last dose recommended in the late afternoon to reduce the risk of hypertension at night. Clinically, midodrine is often considered when non-pharmacologic strategies for orthostatic hypotension (such as increased salt/fluid intake, compression stockings, or physical counter-maneuvers) are not enough. Pharmacists should also be aware of prescribing cascades—such as urinary retention leading to tamsulosin in...

Zosyn (piperacillin/tazobactam) is a broad-spectrum β-lactam/β-lactamase inhibitor combination used widely in hospitals. Piperacillin covers gram-positive, gram-negative, and anaerobic bacteria, while tazobactam helps protect against β-lactamase breakdown. It is commonly used for pneumonia, intra-abdominal infections, skin and soft tissue infections, and febrile neutropenia. An important pharmacology pearl for exams is understanding that Pseudomonas, but it doesn't cover MRSA. The drug is renally eliminated, so dosing adjustments are needed in kidney impairment. Many institutions use extended or prolonged infusions to maximize time above the MIC, which can improve efficacy. Standard dosing is 3.375 g to 4.5 g every 6–8 hours, with modifications for dialy...

Senna is a stimulant laxative. Its pharmacological activity comes from natural compounds called sennosides. Metabolites act locally in the colon to stimulate peristalsis, thereby accelerating bowel movements. While osmotic laxatives are generally considered first-line laxative agents, this makes senna a useful alternative for the short-term treatment of constipation. The pharmacokinetics of senna are unique in that its onset of action typically takes 6 to 12 hours after oral administration, reflecting the time required for colonic bacteria to metabolize sennosides into active compounds. This delayed onset makes senna better suited for bedtime dosing when overnight relief is desired. Although senna is effective, its...

Revefenacin (brand name Yupelri) is a long-acting muscarinic antagonist (LAMA) used for the maintenance treatment of chronic obstructive pulmonary disease (COPD). It works by blocking muscarinic receptors, particularly the M3 subtype, in airway smooth muscle. This antagonism reduces cholinergic bronchoconstriction and leads to sustained bronchodilation. Unlike short-acting anticholinergics such as ipratropium, revefenacin provides 24-hour bronchodilation with once-daily dosing. One of the distinguishing features of revefenacin is that it is the first nebulized LAMA approved for COPD maintenance therapy. Many patients with advanced COPD, physical limitations, or difficulty using handheld inhalers benefit from a nebulized formulation, as it allows medication delivery...

Desmopressin is a synthetic analog of vasopressin, also known as antidiuretic hormone (ADH). It works by mimicking the action of natural ADH on the kidneys, primarily increasing water reabsorption in the collecting ducts. This effect reduces urine production and helps concentrate the urine. Because of this mechanism, desmopressin is commonly used in conditions like diabetes insipidus, nocturnal enuresis (bedwetting), and sometimes for nocturia in adults. It also has a role in certain bleeding disorders, such as mild hemophilia A and von Willebrand disease, since it can increase plasma levels of factor VIII and von Willebrand factor. In this podcast, we...

On this podcast, I cover ciprofloxacin pharmacology. Ciprofloxacin is one of the most widely recognized fluoroquinolone antibiotics and has been on the market for decades. Because of its broad utility, it often comes up in practice, but it also carries significant adverse effect concerns and boxed warnings that pharmacists and prescribers need to keep in mind. From a pharmacology standpoint, ciprofloxacin works by inhibiting bacterial DNA gyrase and topoisomerase IV, enzymes that are essential for bacterial DNA replication, transcription, and repair. This action gives ciprofloxacin bactericidal activity against a variety of gram-negative organisms, including E. coli, Klebsiella, Enterobacter, and Pseudomonas...

Vilazodone (brand name Viibryd) is an antidepressant with a unique pharmacologic profile compared to most other agents in the SSRI class. While not a first-line choice for every patient, understanding its mechanism, adverse effects, and interaction profile is essential for optimizing therapy and preventing downstream prescribing problems. Mechanism of ActionVilazodone is classified as a selective serotonin reuptake inhibitor (SSRI) and a partial agonist at the 5-HT1A receptor. The SSRI activity increases synaptic serotonin by blocking the serotonin transporter, while partial agonism at 5-HT1A receptors may contribute to antidepressant effects and potentially reduce certain SSRI-associated adverse effects (though clinical...

Solifenacin is a bladder antimuscarinic medication most commonly used for overactive bladder (OAB) with symptoms of urinary frequency, urgency, and urge incontinence. Like other agents in its class, understanding the pharmacology can help anticipate potential side effects, drug interactions, and downstream prescribing problems. Mechanism of Action Solifenacin selectively blocks muscarinic M3 receptors in the bladder detrusor muscle. Inhibiting these receptors reduces involuntary bladder contractions, increases bladder capacity, and delays the urge to void. While M3 selectivity may theoretically reduce side effects compared to nonselective antimuscarinics, in clinical practice, many anticholinergic effects still occur. Adverse Effects Because muscarinic receptors are present...

In this episode, we break down itraconazole—a potent antifungal with a lot of baggage. If you’re a pharmacist, clinician, or student who needs to understand how this drug works and why it can be tricky to use, this episode is for you. We start with the basics. Itraconazole blocks 14α-demethylase, an enzyme fungi need to make their cell membranes. That disruption kills or slows the fungus. It works against tough bugs like Aspergillus, Histoplasma, and Blastomyces, plus common skin infections. Side effects? Nausea, liver enzyme elevations, and more seriously, heart failure. Yes, itraconazole has a black box warning for w...

In this episode of our pharmacology podcast, we take a deep dive into the pharmacology of levomilnacipran (Fetzima), a unique serotonin-norepinephrine reuptake inhibitor (SNRI) approved for the treatment of major depressive disorder (MDD) in adults. Designed for pharmacy students, clinicians, and anyone interested in psychopharmacology, this episode breaks down what makes levomilnacipran different from other antidepressants and how to use it effectively in clinical practice. We explore levomilnacipran's mechanism of action, which features a greater affinity for norepinephrine reuptake inhibition compared to serotonin—an uncommon trait among SNRIs. This pharmacologic profile gives it a distinctive effect on energy, motivation, and ph...

Asenapine is an atypical antipsychotic that acts as an antagonist at multiple receptors, including dopamine D2 and serotonin 5-HT2A, contributing to its antipsychotic and mood-stabilizing effects. Adverse effects of asenapine include somnolence, dizziness, and extrapyramidal symptoms. Because asenapine is significantly metabolized by CYP1A2, inhibitors or inducers of these enzymes can affect its plasma concentrations. Co-administration with other CNS depressants may increase the risk of sedation and impaired cognitive or motor function. Asenapine can prolong the QT interval, so caution is advised when used with other medications that affect cardiac conduction.

Loxapine is a first-generation (typical) antipsychotic with dopamine D2 receptor antagonism as its primary mechanism, though it also has affinity for serotonin 5-HT2A receptors, making its pharmacology somewhat atypical. Loxapine is available in multiple formulations, including oral capsules and an inhalation powder, the latter approved specifically for acute agitation in patients with schizophrenia or bipolar I disorder. Sedation and extrapyramidal symptoms (EPS), including dystonia, akathisia, and parkinsonism, are common adverse effects due to its potent dopamine blockade in the nigrostriatal pathway. Orthostatic hypotension can occur with loxapine due to its alpha-1 adrenergic blockade, requiring monitoring in elderly patients or...

Ketoconazole is an imidazole antifungal that works by inhibiting fungal cytochrome P450 14α-demethylase, an enzyme essential for ergosterol synthesis, which disrupts fungal cell membrane integrity. Common adverse effects of ketoconazole include nausea, vomiting, abdominal pain, and elevated liver enzymes, with hepatotoxicity being a notable concern. Ketoconazole carries a boxed warning for severe hepatotoxicity, including cases of liver failure and death, and should not be used as a first-line treatment for fungal infections when other safer antifungals are available. Another boxed warning highlights ketoconazole’s potential to prolong the QT interval, increasing the risk for life-threatening ventricular arrhythmias such as torsades de...

NSAIDs can reduce the effectiveness of antihypertensive medications such as ACE inhibitors, ARBs, beta-blockers, and diuretics by promoting sodium and water retention and decreasing renal blood flow. Combining NSAIDs with anticoagulants or antiplatelet agents like warfarin or aspirin significantly increases the risk of gastrointestinal bleeding, due to additive effects on platelet inhibition and mucosal irritation. NSAIDs can elevate lithium levels and increase the risk of toxicity, as they reduce renal clearance of lithium by decreasing renal perfusion. Co-administration of NSAIDs with methotrexate can impair methotrexate elimination, leading to elevated levels and potential toxicity, especially at high methotrexate doses. When NSAIDs...

Lotrisone is a topical cream that contains a combination of clotrimazole, an antifungal, and betamethasone dipropionate, a corticosteroid. It is used to treat fungal skin infections such as athlete’s foot, jock itch, and ringworm that also involve inflammation or itching. Clotrimazole works by disrupting the fungal cell membrane, while betamethasone reduces redness, swelling, and itching. Lotrisone should not be used on the face, groin, or underarms for extended periods due to the risk of skin thinning and other steroid-related side effects.

Fluphenazine is a high-potency typical antipsychotic that primarily acts as a dopamine D2 receptor antagonist in the mesolimbic pathway, reducing positive symptoms of schizophrenia. Extrapyramidal symptoms (EPS), such as dystonia, akathisia, and parkinsonism, are common due to potent D2 blockade in the nigrostriatal pathway. Neuroleptic malignant syndrome (NMS), though rare, is a life-threatening adverse effect characterized by rigidity, hyperthermia, altered mental status, and autonomic instability. CYP2D6 inhibitors (e.g., fluoxetine, paroxetine) can increase fluphenazine plasma concentrations, potentially raising the risk of toxicity and side effects. Concomitant use of fluphenazine with CNS depressants (e.g., alcohol, benzodiazepines) can enhance sedation...

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 dy...

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...

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...

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 di...

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 c...

On this episode of the Real Life Pharmacology podcast, I discuss Miralax (polyethylene glycol) pharmacology, adverse effects, and much more. MiraLAX is an osmotic laxative commonly used to treat occasional constipation by retaining water in the stool to increase stool frequency and soften consistency. The standard adult dose of MiraLAX is 17 grams (approximately one heaping tablespoon) dissolved in 4 to 8 ounces of liquid once daily. Electrolyte imbalances are rare but possible with prolonged or excessive use of Miralax, particularly in elderly or renal-impaired patients. Advise patients to maintain adequate hydration while using MiraLAX to support its mechanism and reduce side effects.

Today’s sponsor is Freed AI! Freed’s AI medical scribe listens, transcribes, and writes notes for you. Over 15,000 healthcare professionals use Freed and you should too! Learn more here! On this episode of the Real Life Pharmacology Podcast, we cover minoxidil pharmacology, adverse effects, drug interactions, and much more. Minoxidil is a potent arterial vasodilator used in the treatment of hypertension and androgenetic alopecia. The route of administration greatly impacts the drug’s safety profile. Oral minoxidil is typically reserved for refractory hypertension due to its strong systemic effects and associated risks. Topical formulations (2% or 5%) are widely used for hair re...

Today’s sponsor is Freed AI! Freed’s AI medical scribe listens, transcribes, and writes notes for you. Over 15,000 healthcare professionals use Freed and you should too! Learn more here! Prednisone is a commonly used medication for its antiinflammatory and immunosuppressive action. On this episode I discuss prednisone pharmacology, ADRs, and much more. In the episode, I discuss how prednisone affects the HPA system in the body. Cortisol production can be greatly impacted by long term use of prednisone. GI adverse effects can be problematic with oral prednisone which is why we often give this medication with food or milk. Hyper...

Today’s sponsor is Freed AI! Freed’s AI medical scribe listens, transcribes, and writes notes for you. Over 15,000 healthcare professionals use Freed and you should too! Learn more here! On this episode of the Real Life Pharmacology Podcast, I cover linagliptin pharmacology, adverse effects, drug interactions, and much more. Linagliptin is a DPP-4 inhibitor used to help control blood sugar levels in adults with type 2 diabetes. It works by increasing the levels of incretin hormones, which stimulate insulin release and decrease glucagon levels in the blood. Linagliptin is usually taken once daily and can be used alone or in combi...

Meclizine is classified as a first-generation antihistamine. I discuss meclizine pharmacology, adverse effects, drug interactions, and much more. Meclizine is included on the Beers list due to its highly anticholinergic activity. Anticholinergic effects include constipation, dry eyes, dry mouth, urinary retention, and confusion. Sedation is an important adverse effect of meclizine. This adverse effect can be increased when used with other sedating medications such as opioids and benzodiazepines. Meclizine is primarily used for vertigo and motion sickness in clinical practice. The usual starting dose ranges between 12.5 to 25 mg. Meclizine is partially broken down by CYP2D6 so medications like bupropion...

In this episode, I discuss amphetamine/dextroamphetamine pharmacology, adverse effects, drug interactions, and much more. Stimulants like Adderall are well known to cause insomnia. This adverse effect can be affected by the timing of the dose. Lack of growth and poor appetite are two important things to monitor in pediatric patients taking Adderall. Changes in the pH of the stomach/gut can alter the absorption of Adderall. I discuss this in greater detail in this podcast episode. Cardiovascular monitoring is essential with the use of stimulants like Adderall. Pulse and heart rate are two important vital signs to assess.

Today’s sponsor is Freed AI! Freed’s AI medical scribe listens, transcribes, and writes notes for you. Over 15,000 healthcare professionals use Freed and you should too! Learn more here! Benazepril is an ACE inhibitor used to treat hypertension by blocking the conversion of angiotensin I to angiotensin II, reducing vasoconstriction. Combining benazepril with potassium-sparing diuretics or potassium supplements increases the risk of hyperkalemia due to aldosterone suppression. Common side effects of benazepril include dry cough, hyperkalemia, and hypotension due to its effect on the renin-angiotensin-aldosterone system. Benazepril can be prescribed alone or in combination with other antihypertensive agents, such as di...

Today’s sponsor is Freed AI! Freed’s AI medical scribe listens, transcribes, and writes notes for you. Over 15,000 healthcare professionals use Freed and you should too! Learn more here! On this podcast episode, I cover loratadine pharmacology, adverse effects, drug interactions, and much more. Loratatdine is a second generation antihistamine. It has a lower incidence of central nervous system adverse effects compared to first-generation antihistamines like diphenhydramine. Loratadine dosing varies in pediatric patients and those with renal impairment. I get into the details on this podcast episode. Drug interactions aren't common with loratadine but I discuss a few that may b...

Modafinil (Provigil) is a CNS stimulant medication. I cover modafinil pharmacology, adverse effects, drug interactions, and much more on this podcast episode. You should be aware that modafinil is a Schedule 4 controlled substance so it does carry a risk of dependence and addiction. Modafinil can cause CYP3A4 induction and lead to lowering the concentrations of many medications. This includes antiepileptic agents and oral contraceptives. The most common adverse effects of modafinil include ramping up the body and causing symptoms such as anxiety and insomnia. Cardiovascular changes are a risk with modafinil as this medication can contribute to hypertension and...

This episode is sponsored by Meded101.com/store - Go check out their resources, books, and review courses! They will help you prepare to pass your pharmacology classes and board exams! Lansoprazole is a PPI that can be used for GERD, ulcers, and other GI conditions. B12 and magnesium deficiency are possible long-term mineral and vitamin effects. Augmentin is a combination medication of amoxicillin and clavulanate. It is an antibiotic for infection. Diarrhea is the most common adverse effect. Lovastatin is a cholesterol-lowering medication. It is often not a preferred statin due to CYP3A4 interaction and it is less...

Today’s sponsor is Freed AI! Freed’s AI medical scribe listens, transcribes, and writes notes for you. Over 15,000 healthcare professionals use Freed and you should too! Learn more here! Clopidogrel (Plavix) is an antiplatelet medication. You need to understand the pharmacokinetics of clopidogrel and how CYP2C19 affects this medication. Doxycycline is a tetracycline antibiotic. Calcium, iron, and other metal cations can bind doxycycline and reduce the absorption of the medication. Hyzaar is a combination of losartan and hydrochlorothiazide. Losartan is an ARB and hydrochlorothiazide is a thiazide diuretic. Kytril (granisetron) is an antiemetic medication. It is from the same...

Today’s sponsor is Freed AI! Freed’s AI medical scribe listens, transcribes, and writes notes for you. Over 15,000 healthcare professionals use Freed and you should too! Learn more here! On this episode of the Real Life Pharmacology Podcast, we will cover medications 186-190 on the Top 200 Drugs List. The medications included in the podcast episode are Sonata, Zebata, Zovirax, Coumadin, and Luvox. Sonata (ezopiclone) is a Z-drug used for insomnia. It has many similar effects to benzodiazepines and a similar mechanism of action. Zebeta (bisoprolol) is a beta-blocker used for the treatment of hypertension, atrial fibrillation, and heart failure among...