Real Life Pharmacology - Pharmacology Education for Health Care Professionals

On this episode of the Real Life Pharmacology Podcast, I cover some of the most common food and supplement drug interactions. The 3 G's can potentially increase the risk of bleeding in patients on anticoagulants and antiplatelets. I discuss what supplements these are. There are some vitamins that can cause drug interactions. Vitamin C is a supplement that can alter the absorption of some medications. Metal cations like iron can bind certain medications and reduce absorption. I discuss which medications are most likely to be affected.

On this episode, I discuss the new medication vonoprazan and where it will likely be used in practice. Vonoprazan is from a brand new class of medication called "PCAB". I discuss this medication and its pharmacology in this podcast episode. Drug interactions and cost are the two major downsides of this medication that will likely limit its use compared to the PPIs. CYP3A4 inducers like rifampin, carbamazepine, and phenytoin should not be used with vonoprazan. They will reduce the effectiveness of vonoprazan.

Today’s sponsor of the 10 Commandments of Polypharmacy podcast is FreedAI. Freed listens, transcribes, and writes medical documentation for you. FreedAI is offering a discount exclusive to RLP listeners! Users will get $50 off their first month with Freed! Use the discount code: RLPPOD Here is part 2 of 2 on the final 5 of the 10 commandments of polypharmacy. 6. Thou shalt identify limits for medications not intended for chronic use as well as not continue a medication indefinitely for symptoms that have an expected short duration 7. Thou shalt not start a medication from a similar medication class without appropriate rationale 8. Thou shalt not initiate a medication without considering medications that may treat duplicate conditions – Kill two birds with one stone 9. Thou shalt consider eliminating or reducing medications at every medication review 10. Thou shalt be willing to accept risk in discontinuing a medication if they were willing to accept the risk of initiating a medication

On this special episode, I provide some real-life examples and layout 5 of my 10 commandments of polypharmacy. Today’s sponsor of the 10 Commandments of Polypharmacy podcast is FreedAI. Freed listens, transcribes, and writes medical documentation for you. FreedAI is offering a discount exclusive to RLP listeners! Users will get $50 off their first month with Freed! Use the discount code: RLPPOD Here are the first 5 commandments that are addressed in the podcast. 1. Thou shalt not start, ask for, dispense, or administer medication without reviewing a medication list that is accurate, up to date, and complete with over-the-counter medications and supplements 2. Thou shalt consider utilizing non-drug approaches and interventions to solve patient problems before initiating medication 3. Thou shalt assess if a medication is effective before adding a new medication for the same condition 4. Thou shalt consider any new symptom is an adverse effect of another medication until proved otherwise 5. Thou shalt not start a medication without an appropriate indication and assessing appropriate lab work

Today’s sponsor of the Top 10 Anticoagulant Drug Interactions podcast is FreedAI. Freed listens, transcribes, and writes medical documentation for you. FreedAI is offering a discount exclusive to RLP listeners! Users will get $50 off their first month with Freed! Use the discount code: RLPPOD Apixaban is one of the most commonly used anticoagulants and there are some drug interactions you need to be aware of. Take a listen and find out! Warfarin concentrations can substantially be elevated by drugs that inhibit CYP2C9. I cover a few of them in my top 10 anticoagulant drug interactions.

Today's sponsor of the Top 10 SSRI Drug Interactions podcast is FreedAI. Freed listens, transcribes, and writes medical documentation for you. FreedAI is offering a discount exclusive to RLP listeners! Users will get $50 off their first month with Freed! Use the discount code: RLPPOD In this podcast episode, I discuss how to navigate SSRI drug interactions and identify some of the most common medications that have additive serotonergic activity. SSRIs have antiplatelet activity. I discuss how to navigate using other medications that may increase bleed risk in combination with SSRIs. Paroxetine and fluoxetine inhibit CYP2D6 I discuss how this can affect the benefits of tamoxifen therapy. Fluvoxamine is a nasty medication with regard to the number of and significance of drug interactions. I outline important fluvoxamine interactions in this podcast episode.

On this episode, I discuss travoprost pharmacology, adverse effects, administration, and much more on this podcast episode. Travoprost is used to reduce intraocular pressure in the management of glaucoma. I discuss the mechanism of action and adverse effects. Travoprost is a prostaglandin analog that can help reduce intraocular pressure and reduce the risk of the potential complication of blindness. Growth of eyelashes is a unique adverse effect associated with travoprost.

On this podcast episode, I finish up my breakdown of the Beers Criteria. I cover the use of sliding-scale insulin and sulfonylureas in geriatric patients. Hypoglycemia is a major concern with both of these diabetes management strategies. PPIs show up on the Beers criteria list as they can increase the risk of C. diff, pneumonia, fractures, and GI malignancies. Metoclopramide has dopamine antagonist activity and can increase the risk of EPS and tardive dyskinesia.

In this podcast episode, I break down some of the most common medications that show up on the Beers criteria list. I discuss cardiovascular medications in this podcast episode, including rivaroxaban and warfarin, and why they show up on the Beers list. Alpha-blockers who up on the Beers list as these medications are inappropriate to use for the management of hypertension. The Beers criteria addresses the use of aspirin in primary prevention. I break down what the criteria state and why it should be avoided in general.

On this episode, I discuss the pharmacology surrounding QTc prolongation and drug interactions. I discuss which medications are more likely to cause QTc prolongation and which patient populations we should be more concerned about. Antiarrhythmics are a common class of medication that can exacerbate QTc prolongation when used with other interacting medications. 500 ms is a common value utilized to help identify patients at risk for QTc prolongation and ultimately torsades de pointes.

On this podcast episode, I cover risedronate pharmacology, adverse effects, drug interactions, and much more. There is a strict administration procedure with risedronate which is designed to reduce adverse effects and enhance absorption. I discuss this in the podcast. Many medications may cause osteoporosis and may precipitate treatment with risedronate. Corticosteroids and excessive thyroid hormone replacement are two examples. Patients should remain upright (sitting or standing) for at least 30 minutes following administration to reduce the risk of esophagitis and ulceration.

On this podcast episode, I discuss some of the most common antihypertensive drug interactions you need to know. One major interaction I discuss is the trifecta of a diuretic, an ACE or ARB, and an NSAID. This combination significantly increases the risk for acute renal failure. Nitrates aren't classically referred to as an antihypertensive but they can definitely cause some problems when combined with PDE5 Inhibitors. Lithium can interact with 3 blood pressure medication classes. ACEIs, ARBs, and diuretics can all increase the risk for lithium toxicity.

Teplizumab is a relatively new agent that helps delay the progression of type 1 diabetes. It slows the rate of beta-cell destruction in the pancreas. Teplizumab is associated with cytokine release syndrome which can result in flu-like symptoms of fever, aches, and headache. Cytokine release syndrome due to teplizumab can be reduced by using appropriate pretreatment medications. Those medications can include analgesics, antihistamines, and/or antiemetics. Teplizumab is associated with suppressing the immune system so it is ideal to get vaccinations completed before using this medication. I go over the specific recommendations in the podcast episode.

On this podcast episode, I discuss captopril pharmacology, kinetics, interactions, and much more! Captopril is an ACE Inhibitor. It can cause hyperkalemia, cough, and renal impairment. One of the notable issues with captopril is its relatively short half-life which requires it to be dose frequently throughout the day. Lithium is an important drug interaction and the use of captopril with this medication may increase concentrations and the chance for toxicity.

On this episode of the Real Life Pharmacology podcast, I take a dive into the most common mechanisms of drug interactions. Below I list some of the common drug interactions seen in practice and how they work! Opposing Effects Many drugs will work on various receptors throughout the body. To use as an educational point, there is no better example to point to than the beta receptor. Beta-blockers are frequently used in clinical practice for their ability to lower blood pressure and slow the heart rate. Both of these beneficial actions are primarily achieved by blocking the effects of beta-1 receptors. Some beta-blockers have action on alternative beta receptors. Propranolol is one such beta-blocker that is classified as a non-selective beta-blockers. This means that in addition to the positive effects on beta-1 receptors, it can also have blocking effects on beta-2 receptors. The blockade of the beta-2 receptor by propranolol can also be life-changing. It can directly oppose beta-2 agonists like albuterol from having their beneficial effects of opening up the airway. Enzyme Inhibition Medication metabolism is arguably the largest and most clinically significant source for drug interactions. Medications that are primarily metabolized by enzymes in the liver can be greatly affected if we affect how those enzymes work. CYP3A4 is one of the most well studied and well-known enzymes that can impact hundreds to maybe even thousands of drugs. Apixaban is an oral anticoagulant that is broken down at least in part by CYP3A4. By using a CYP3A4 inhibitor like erythromycin, there is the potential to raise concentrations of apixaban. This could lead to a higher risk of bleeding. Enzyme Induction Carbamazepine is a drug that you must know. This drug is a potent enzyme inducer. This differs significantly from an enzyme inhibitor and will have the exact opposite clinical effect. Drugs that are inactivated by liver enzymes will be inactivated more quickly in a patient taking an enzyme inducer. Going back to our prior apixaban example above, carbamazepine can induce CYP3A4 and facilitate a more efficient and swifter breakdown of the drug. Bleeding will be less likely. The risk for treatment failure, usually in the form of a blot clot, will be more likely. Here’s more information from the past on carbamazepine. Alteration in Absorption Binding interactions can be consequential and are one of the most common types of drug interactions. Many medications have the potential to bind one another in the gut. This can lead to lower concentrations of a specific medication. Calcium and iron are two of the most common examples of medications that can bind other drugs. Alteration in Protein Binding By remembering that unbound drug is an active drug, you should appreciate the risk for protein binding alterations. A significant number of medications can bind proteins in the bloodstream. As this occurs, that drug is not freely available to create physiologic effects. When another medication is added that can also bind these proteins, this can displace other medications and increase the quantity of free drug in the bloodstream. This essentially allows for enhanced physiologic effects. Warfarin is a medication that is highly protein-bound. When another drug is added that can kick warfarin off of those protein binding sites, it can free up warfarin which will increase the likelihood of elevating the patient’s INR and increase their bleed risk. Alteration in Renal Elimination Some drugs can alter the way other medications are eliminated through the kidney. Chlorthalidone, like all thiazide diuretics, has the potential to block the excretion of lithium from the kidney. This can lead to lithium toxicity. This type of interaction, while significant, is much less common than drug interactions involve the liver and CYP enzyme pathways. Effects on Transporters One of the last types of drug interactions is the effe...

On this podcast episode, I discuss insulin aspart pharmacology, adverse effects, drug interactions, and much more. Insulin apart is a rapid acting insulin product meant to bring down blood sugars quickly (most often after meals). It is important to remember a couple of medications that may counteract the effects of insulin and apart and raise blood sugar. I talk about corticosteroids and thiazide diuretics in the drug interaction section. Fiasp is a slightly modified insulin aspart molecule that allows for quicker absorption. This quicker absorption will allow for blood sugars to come down sooner than the Novolog formulation.

On this podcast episode, I discuss gentamicin pharmacology, adverse effects, monitoring, drug interactions and much more! Drug monitoring is critical with gentamicin. Trough and peak concentrations can guide therapy and identify someone at risk of toxicity. Nephrotoxicity is a major concern with gentamicin. There are numerous nephrotoxic agents that can increase this risk. I discuss them on the podcast. Ototoxicity is another risk associated with gentamicin. Loop diuretics like furosemide can increase this risk. Learn more on this podcast episode.

On this podcast episode, I discuss fenofibrate pharmacology, adverse effects, kinetics, drug interactions, and much more! Fenofibrate is typically only used for hypertriglyceridemia. The primary risk of hypertriglyceridemia is pancreatitis so we treat these levels because of this risk. LFTs elevation has been associated with fenofibrate use as well as myopathy. In the presence of myopathy, checking CPK may be considered. Fenofibrate is a weak CYP2C9 inhibitor. Warfarin and phenytoin are two important medications that may be affected by the use of fenofibrate.

On this podcast episode, I discuss levofloxacin pharmacology, adverse effects, boxed warnings, interactions, and much more. Levofloxacin is well known to cause QTc prolongation and many drugs can increase this risk such as antiarrhythmics, citalopram, antipsychotics, and many more. Binding interactions are important when discussing levofloxacin pharmacology. Calcium, iron, magnesium, and many other cations can block the absorption of this medication. I discuss tendon rupture in relation to levofloxacin use and what factors may increase the risk of this rare adverse effect.

On this podcast episode, I discuss darifenacin pharmacology, adverse effects, drug interactions and much more. CYP3A4 and CYP2D6 are important enzymes in relation to darifenacin. I breakdown the importance of these enzymes and how they can impact drug therapy. Darifenacin has anticholinergic activity but affects the central nervous system less than other agents in its class such as oxybutynin and tolterodine. Darifenacin's pharmacology is selective for the Muscarinic-3 (M3) receptor in bladder tissue which helps reduce the risk for CNS adverse effects.