This nursing pharmacology review provides a high-yield overview of the most important antibiotic classes used in clinical practice. The video explains how common antibiotics work, what infections they treat, and the major nursing considerations associated with each class. Key topics include penicillins, cephalosporins, macrolides, fluoroquinolones, tetracyclines, vancomycin, aminoglycosides, and sulfonamides. Emphasis is placed on side effects, black box warnings, allergy considerations, renal dosing, patient counseling, and critical monitoring parameters nurses should recognize in both inpatient and outpatient settings.
You can find the full 16+ hour nursing pharmacology review course, including PDF handouts, cheat sheets, practice questions, and on-demand videos at meded101.com!
Moxifloxacin is a fourth-generation fluoroquinolone that works by inhibiting bacterial DNA gyrase and topoisomerase IV—two enzymes essential for DNA replication, repair, and transcription. By blocking both targets, it provides broad-spectrum activity against gram-positive, gram-negative, and atypical pathogens. Its enhanced gram-positive coverage, especially against Streptococcus pneumoniae, distinguishes it from earlier fluoroquinolones like ciprofloxacin.
Pharmacokinetically, moxifloxacin has excellent oral bioavailability, meaning the PO and IV doses are essentially interchangeable. It distributes well into tissues like the lungs and sinuses, making it a frequent choice for respiratory infections. With a long half-life of about 12 hours, once-daily dosing is standard.
Adverse effects are similar to the fluoroquinolone class, with concerns including tendonitis and tendon rupture, QT interval prolongation, CNS effects like confusion or agitation—particularly in older adults—and the risk of peripheral neuropathy. Moxifloxacin is especially notable for a higher propensity toward QT prolongation compared with some of its peers, making it important to avoid in patients with existing QT issues or those taking other QT-prolonging medications.
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 impairment.
Monitoring creatine kinase (CK) levels is crucial, as one of the major adverse effects is myopathy and, rarely, rhabdomyolysis. Patients on statins have a higher risk of muscle toxicity, and clinicians should consider holding or monitoring statin therapy closely.
Eosinophilic pneumonia is another rare but serious adverse reaction that can develop after prolonged therapy. Daptomycin has minimal drug interactions, making it an appealing option when other agents pose risks. Overall, it’s a powerful antibiotic when used appropriately, but requires careful monitoring for muscle and respiratory-related side effects.
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 dialysis patients.
Adverse effects include hypersensitivity, gastrointestinal upset, electrolyte imbalances like hypokalemia, and blood count changes with prolonged therapy. A key clinical concern is nephrotoxicity risk, especially when used with vancomycin. Monitoring renal function and electrolytes are important.
Methotrexate and probenecid are two medications that can interact with Zosyn. Concentrations of Zosyn can be increased when these medications are used in combination.
On this episode of the Top 200 Drugs pharmacology podcast, I cover fluticasone nasal spray, allopurinol, alendronate, famotidine, and cefdinir.
Fluticasone is a corticosteroid that can be used nasally for the treatment of allergic rhinitis.
Allopurinol is a xanthine oxidase inhibitor used to reduce uric acid and prevent gout flares.
Alendronate is a bisphosphonate that inhibits the action of osteoclasts. This action helps treat osteoporosis.
Famotidine is a histamine-2 receptor antagonist that helps reduce gastric acid secretion and alleviate heartburn symptoms.
Cefdinir is a third-generation cephalosporin that is often used as an alternative for those who cannot take penicillin antibiotics. There is a small risk for cross-reactivity that a clinician has to consider.
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 cephalexin pharmacology, adverse effects, drug interactions, and much more!
Penicillin allergies and cross-reactivity are common questions with regard to the use of cephalexin and I discuss this briefly in the podcast episode.
Cephalexin is a first-generation cephalosporin with its primary sweet spot being gram-positive bacteria like Staph and Strep species.
Warfarin, probenecid, zinc, and a couple of others are potential medications that can interact with cephalexin. I discuss this further in this podcast episode.
