Episodes

Clopidogrel is an antiplatelet agent that is often used in combination with aspirin to help reduce the risk of an MI. The risk of bleed is a high priority with the use of clopidogrel. Patients must be monitored for signs and symptoms of bleeding and bruising. Clopidogrel is a prodrug that is converted to its active metabolite by CYP2C19. Fluconazole can inhibit CYP2C19 which may reduce the effectiveness of clopidogrel. Be sure to check out our free Top 200 study guide – a 31 page PDF that is...

Sulfasalazine is a medication that can be used for diseases like rheumatoid arthritis, Crohn’s disease, and Ulcerative Colitis. Because sulfasalazine can cause GI upset, this is a major reason why we try to break up the dose and give it multiple (at least two) times per day. LFT and CBC monitoring are recommended with sulfasalazine due to its low potential to cause liver dysfunction, aplastic anemia, and agranulocytosis. Sulfasalazine can impair folic acid absorption and lead to potential def...

On this episode, I discuss the pharmacology of cholestyramine. Cholestyramine was originally developed as an agent to manage cholesterol, but has fallen out of favor for some of the more effective agents like statins. Cholestyramine is notorious for binding drug interactions. It can reduce concentrations of drugs like amiodarone, digoxin, oral contraceptives, immunosuppressive and many more! In patients with chronic diarrhea, cholestyramine is occasionally used off label to help manage sympto...

Rifampin is classified as an antibiotic and an antituberculosis agent. It primarily works by inhibiting bacterial RNA polymerase. While not extremely common, rifampin is well known to cause hepatic dysfunction. You should remind patients who are taking rifampin that it can alter the color of tears, sweat, saliva and urine. It can change these fluids to a reddish/brown color. Rifampin is very well known for causing drug interactions. It is an enzyme inducer that can reduce the concentrations o...

Heparin is an interesting drug with a lot of unique clinical quirks. This drug ultimately inhibits the formation of fibrin. Fibrin is an essential component of a blood clot. Because heparin has blood thinning effects, it is critical to assess a patient’s bleed risk. Look out for other agents that may increase the risk of bleeding. Examples include; NSAIDs, antiplatelet agents, and other anticoagulants. One classic test question about heparin that often comes up is the reversal agent. Protamine...

On this episode, I discuss montelukast pharmacology Montelukast is a leukotriene receptor antagonist. Leukotrienes play an important role in causing inflammation and smooth muscle contraction in asthma and allergic rhinitis. Because montelukast blocks the effects of leukotrienes, it can be advantageous to use this medication for allergies and asthma. It is important to remind patients that montelukast is NOT a substitute for an acute relief medication like albuterol in the management of asthm...

On this episode, I discuss clozapine pharmacology. This drug has multiple mechanisms of action: Dopamine blockade, anticholinergic activity, and alpha blocking activity all contribute to the complexity of this drug. Smoking cessation can significantly increase the concentrations of clozapine. This is because smoking can induce CYP1A2. Listen to the podcast for more details on how this can impact our patients clinically. Clozapine has 5 boxed warnings. I discuss them all in this podcast. The mo...

On this episode, I discuss carbamazepine pharmacology. This drug is most commonly used for seizures, bipolar disorder, or trigeminal neuralgia. Carbamazepine is an autoinducer and can reduce the concentrations of numerous drugs. Some examples include apixaban, warfarin, rivaroxaban, diltiazem, verapamil, and many more! Carbamazepine has the potential to cause Steven Johnson’s Syndrome. This has a much greater chance of happening in patients with certain genetics. Carbamazepine can contribute ...

On this episode, I discuss the pharmacology of commonly used stimulant laxatives like sennosides and bisacodyl. Stimulant laxatives “stimulate” the GI tract smooth muscle which helps propel fecal material out of the body and thus helping to relieve constipation. Patients who are having diarrhea and are unsure of what medications they are taking should have their regimen assessed for these medications. Chronic opioid therapy is a situation where chronic stimulant laxative therapy may be used. ...

On this episode, I discuss ezetimibe pharmacology. Ezetimibe works by inhibiting Niemann-Pick C1-Like1 (NPC1L1) transporter. This transporter aids in cholesterol absorption so by blocking it, we can reduce cholesterol levels (and LDL) in the bloodstream. Ezetimibe is usually very well tolerated. Diarrhea, myopathy, and elevations in LFT’s are adverse effects that have been reported but do not occur at high rates. Ezetimibe is dosed at 10 mg once daily. This is a nice advantage because this is ...

On this episode, I cover azithromycin pharmacology. This drug primarily acts by inhibiting protein synthesis. It binds to the 50s ribosomal subunit. GI adverse effects like nausea and diarrhea are going to be the most common with azithromycin. Azithromycin has been associated with prolonging the QT interval. Drugs like amiodarone, ondansetron, citalopram, antipsychotics, and quinolone antibiotics can also prolong the QT interval. One major advantage that azithromycin has over other antibiotic...

Rivaroxaban is a factor 10a inhibitor that inhibits clot formation and thins the blood. Rivaroxaban needs to be monitored for bleed risk. Checking periodic CBC can help us assess if hemoglobin and hematocrit are remaining stable. Enzyme inducers like rifampin, St. John’s Wort, and carbamazepine can reduce concentrations and increase the risk of treatment failure. NSAIDs and antiplatelet medications can significantly increase the risk of bleed with rivaroxaban. Rivaroxaban should not be used ...

Valproate (valproic acid, Depakote) has numerous uses which includes migraines, seizures, and bipolar disorder. In a patient who is taking valproate, it is important to monitor for signs and symptoms of confusion as this drug can cause elevated ammonia levels. When switching between dosage forms of valproate, you must recognize that the bioavailability is not the same between each different dosage form. This could lead to toxicity or treatment failure. Valproic acid has a boxed warning for he...

On this episode I discuss the pharmacology of donepezil. Donepezil is an acetylcholinesterase inhibitor. In dementia, that is a deficiency in acetylcholine and donepezil helps preserve this neurotransmitter. Donepezil can cause weight loss, GI upset, and diarrhea. This is an important monitoring parameter in our dementia patients. There is the possibility for donepezil to cause bradycardia and insomnia. Keep an eye out for these adverse effects as they can and do happen in real practice. Ant...

Linezolid is an antibiotic used for bacterial infection. It primarily works by inhibiting bacterial protein synthesis. Linezolid is primarily bacteriostatic against most bacteria which means that it inhibits the growth and doesn’t necessarily kill the bacteria itself. Caution must be used with linezolid and serotonergic drugs as there is a risk for serotonin syndrome. Clinical risk/benefit analysis needs to be done. Linezolid overall has good coverage for VRE and MRSA. It is an option for MRS...

On this episode, I cover pioglitazone pharmacology. The primary mechanism of action with pioglitazone is that it is an agonist at Peroxisome Proliferator Activated Receptor Gamma receptor. This improves insulin sensitivty in the periphery. Two common side effects exist with pioglitazone. This drug can cause weight gain and also contribute to edema. Pioglitazone has a boxed warning and is contraindicated in patients who have symptomatic heart failure. There are a few potential interactions wit...

On this episode I breakdown nitrofurantoin pharmacology. Nitrofurantoin is an antibiotic that is used in the treatment of UTI’s. Nitrofurantoin has activity by creating reactive metabolites that can disrupt protein synthesis and ultimately kills the bacteria causing the infection. It is important to remember with nitrofurantoin, that in the setting of systemic infection and/or kidney involvement, the drug may not be very effective. Nitrofurantoin can potentially reduce the effectiveness of ce...

Hydralazine Pharmacology Hydralazine works as a direct vasodilator. It primarily works on the arterioles versus the venous system. Hydralazine can cause a unique adverse reaction. It can cause a Lupus type syndrome that can result in fever, myopathy and symptoms that mimic arthritis. I discuss drug interactions with hydralazine and how you need to be aware of certain medications that can have additive effects and also those that can oppose the effects of the drug. One of the downsides to usi...

On this episode of the Real Life Pharmacology Podcast, I discuss aspirin pharmacology. The two most common adverse effects with aspirin are GI upset and increasing the risk for bleeding and bruising. A commonly asked test question about aspirin is whether it can be used in pediatrics and what risk we encounter if we use it. Another rare effect with aspirin is tinnitus which I discuss further on this episode. It is critical to pay attention to other medications that can thin the blood in a pa...

Clonidine is classified as an antihypertensive. Clonidine pharmacology involves having agonist activity at central alpha 2 receptors. This leads to lower sympathetic outflow and a reduction in blood pressure. Clonidine has numerous reported uses in addition to its antihypertensive effect. It can potentially be used for ADHD, menopausal type symptoms, and opioid withdrawal. Clonidine has historically been on the Beers’ list of drugs as it can cause some CNS side effects like sedation, dizziness...

Memantine is classified as an NMDA receptor antagonist. Memantine pharmacology is complex as is the pharmacology of any medication working in the brain. This drug can help reduce the activity of glutamate, an excitatory neurotransmitter which can play a role in Alzheimer’s dementia. Memantine has an extended release dosage form that is dosed once per day compared to twice per day for the immediate release. However, the cost of the extended release is much more expensive, so it is recommended to...

On this episode, I discuss magnesium pharmacology and the clinical applications. Magnesium plays numerous important functions in the body and you may see patients take these supplements under the direction of a healthcare professional and sometimes on their own. It is very important to remember that magnesium can cause GI upset and diarrhea. This is often overlooked in our polypharmacy patient. Magnesium can accumulate in renal disease. This is important to remember especially in patients who ...

Trazodone pharmacology is complex. It can inhibit serotonin reuptake, block histamine receptors, and possibly have alpha-blocking activity. Side effects of trazodone include sedation, dizziness, and dry mouth. Rarely, priapism may occur. I’ve seen this nugget come up on pharmacology exams! While trazodone is classified as antidepressant, it is often used to help manage insomnia. Trazodone can possibly prolong the QT interval. Risk of other medications and patient specific parameters should be...

The GLP-1’s are a relatively newer class of medications used to lower blood sugars in diabetes. GLP-1’s work by simulating the effects of incretin hormones in the body. They can help promote fullness, lower weight, and stimulate insulin release following a meal. GLP-1’s can cause significant GI side effects. Nausea is by far the most common adverse effect. It can even lead to diarrhea and vomiting in some cases. There is boxed warning on the GLP-1 agonists. Be aware of patients who have had a...