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Real Life Pharmacology - Pharmacology Education for Health Care Professionals

Real Life Pharmacology - Pharmacology Education for Health Care Professionals

Auteur(s): Eric Christianson PharmD; Pharmacology Expert and Clinical Pharmacist
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 A Meded101.com Production Hygiène et mode de vie sain Troubles et maladies
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  • Senna Pharmacology

    Senna Pharmacology
    Sep 18 2025
    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 use carries potential adverse effects. Common side effects include abdominal cramping, diarrhea, and, rarely, electrolyte disturbances such as hypokalemia. Chronic or excessive use can lead to dependency and possibly melanosis coli, a benign but visible pigmentation of the colon lining. Drug interactions may occur, particularly with medications affected by potassium levels, such as digoxin or diuretics. For these reasons, senna is generally recommended for short-term use, with emphasis on evaluating underlying causes of constipation before long-term therapy is considered.
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    14 min
  • Revefenacin Pharmacology Podcast

    Revefenacin Pharmacology Podcast
    Sep 11 2025
    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 without requiring hand-breath coordination or a forceful inhalation. This makes it a useful option for patients with poor inhaler technique or those transitioning from hospital care. Pharmacokinetically, revefenacin is delivered via nebulization, with peak effects typically observed within a couple of hours. Importantly, systemic absorption is relatively low, but elderly patients or those with hepatic impairment may be more susceptible to anticholinergic side effects. Clinically, revefenacin improves lung function, reduces COPD symptoms, and can decrease exacerbation frequency. Common adverse effects include cough, dry mouth, constipation, and urinary retention. Caution is advised in patients with narrow-angle glaucoma or prostatic hyperplasia due to its antimuscarinic properties. Revefenacin is not intended for acute bronchospasm or rescue therapy—it is strictly for long-term, once-daily maintenance.
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    13 min
  • Desmopressin Pharmacology Podcast

    Desmopressin Pharmacology Podcast
    Sep 4 2025
    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 will explore desmopressin pharmacology and much more. Desmopressin is available in several dosage forms, including oral tablets, intranasal spray, and injectable formulations. The choice depends on the indication and patient-specific factors such as age, convenience, or the need for rapid effect. Adverse effects of desmopressin are largely related to water balance. Because it reduces urine output, patients are at risk for water retention and hyponatremia, which can lead to headaches, confusion, seizures, or in severe cases, coma. Monitoring sodium levels is especially important in elderly patients and those taking other medications that can affect fluid or electrolyte balance. Clinicians also need to be mindful of drug interactions. Medications that increase the risk of hyponatremia, such as SSRIs, carbamazepine, or certain diuretics, may enhance desmopressin’s adverse effects. Conversely, drugs that blunt its activity can reduce effectiveness. Careful monitoring and patient education are key parts of safe use.
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    14 min
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