WGU Pharmacology D441 OA Actual Exam Latest Question And Correct Answers with Explanation.

harmacology for nursing practice requires understanding drug mechanisms, adverse effects, monitoring parameters, and patient education. This essay summarizes the most high-yield concepts for the D441 Objective Assessment. Cardiovascular Drugs form a major focus. Antihypertensives include ACE inhibitors (lisinopril), which can cause a dry cough and angioedema; switching to an ARB (losartan) resolves the cough. Beta-blockers (metoprolol) lower heart rate and blood pressure but mask hypoglycemia and cause bradycardia. Non-selective beta-blockers (propranolol) are contraindicated in asthma. Calcium channel blockers (amlodipine) commonly cause peripheral edema. Diuretics: furosemide (loop) causes hypokalemia and ototoxicity; spironolactone (potassium-sparing) causes hyperkalemia; HCTZ (thiazide) causes hyponatremia, hypokalemia, and hyperglycemia. Heart failure drugs include digoxin, which has a narrow therapeutic index (0.5–2.0 ng/mL). Hypokalemia increases digoxin toxicity (nausea, yellow-green halos, bradycardia, dysrhythmias). The antidote is Digibind (digoxin immune Fab). Sacubitril/valsartan (Entresto) carries black box warnings for angioedema and fetal toxicity. Anticoagulants require close monitoring. Warfarin affects factors II, VII, IX, X; therapeutic INR is 2–3 for atrial fibrillation. Vitamin K is the antidote. Heparin (IV/SubQ) requires aPTT monitoring (1.5–2.5x normal) and platelet counts to detect heparin-induced thrombocytopenia (HIT). Protamine sulfate is the antidote. Direct oral anticoagulants (apixaban, rivaroxaban) do not require routine monitoring but have no universal antidote (andexanet alfa for some). Antiplatelets: aspirin and clopidogrel increase bleeding risk, especially with NSAIDs or anticoagulants. Diabetes medications are heavily tested. Metformin is first-line; it is renally excreted, so serum creatinine/eGFR must be monitored. It is held for 48 hours after IV contrast to prevent lactic acidosis. Insulins: rapid-acting (lispro, aspart) given with meals; short-acting (regular) given 30 minutes before meals; intermediate (NPH) peaks in 4–12 hours; long-acting (glargine) has no peak. Sulfonylureas (glipizide) cause hypoglycemia and weight gain. GLP-1 agonists (semaglutide) cause nausea, weight loss, and pancreatitis risk. SGLT2 inhibitors (empagliflozin) cause UTIs, euglycemic DKA. Opioids are common on the exam. Morphine, hydromorphone, fentanyl cause respiratory depression (priority assessment), constipation (most common long-term effect, tolerance does NOT develop), and sedation. Naloxone is the antidote but has a short half-life (30–60 minutes); repeat dosing may be needed. Patient-controlled analgesia (PCA) allows self-dosing but requires monitoring for respiratory depression. NSAIDs (ibuprofen, naproxen) are contraindicated in peptic ulcer disease, renal disease, and asthma with nasal polyps. They increase bleeding risk, especially with anticoagulants or antiplatelets. Acetaminophen has a maximum daily dose of 3000–4000 mg; overdose causes hepatotoxicity treated with acetylcysteine. Avoid in alcohol use disorder due to increased hepatotoxicity risk. Psychiatric drugs appear frequently. Lithium for bipolar disorder has a therapeutic range of 0.6–1.2 mEq/L (maintenance) and 1.0–1.5 mEq/L (acute mania). Low sodium increases lithium levels. Toxicity (1.5) causes nausea, coarse tremor, confusion, seizures. Clozapine for schizophrenia requires weekly to biweekly CBC monitoring for agranulocytosis. Fever and sore throat in a clozapine patient require immediate CBC. SSRIs (fluoxetine, sertraline) take 4–6 weeks for full effect; side effects include sexual dysfunction and bleeding risk (especially with warfarin). Serotonin syndrome (delirium, myoclonus, tremors, hyperthermia) occurs with excessive serotonergic activity. Antibiotics have key monitoring points. Vancomycin trough levels (10–20 mcg/mL) prevent nephrotoxicity and ototoxicity. Red man syndrome (flushing, pruritus) is infusion rate-related; slow the infusion and give diphenhydramine. Aminoglycosides (gentamicin) also cause nephrotoxicity and irreversible ototoxicity. Rifampin causes harmless orange-red body fluids and induces CYP450 (reduces oral contraceptive effectiveness). Isoniazid causes peripheral neuropathy (prevent with vitamin B6). Trimethoprim-sulfamethoxazole (Bactrim) can cause Stevens-Johnson syndrome (rash, fever, mucosal lesions) and crystalluria (increase fluids). Antifungals: Fluconazole increases warfarin effect (INR elevation). Amphotericin B causes nephrotoxicity and infusion reactions (premedicate with acetaminophen, diphenhydramine). Chemotherapy drugs require safety knowledge. Doxorubicin causes cumulative dose-dependent cardiotoxicity (heart failure). Cisplatin causes nephrotoxicity and peripheral neuropathy. Cyclophosphamide causes hemorrhagic cystitis (prevent with hydration and mesna). Methotrexate is rescued with leucovorin. Rituximab causes infusion reactions and hepatitis B reactivation. Trastuzumab requires baseline and serial echocardiograms for cardiotoxicity. Bevacizumab causes hypertension, proteinuria, and risk of perforation/bleeding. Endocrine drugs: Levothyroxine must be taken on an empty stomach 30–60 minutes before breakfast. Low TSH indicates over-replacement (risk of atrial fibrillation, osteoporosis). Methimazole for hyperthyroidism can cause agranulocytosis (fever, sore throat = stop and get CBC). Alendronate (bisphosphonate) requires staying upright for 30 minutes after taking to prevent esophagitis. Osteonecrosis of the jaw is a rare but serious adverse effect. Respiratory drugs: Albuterol is a rescue inhaler; using it more than twice weekly indicates poor asthma control. Inhaled corticosteroids (fluticasone) require mouth rinsing to prevent oral thrush. GI drugs: Ondansetron (Zofran) causes constipation and QT prolongation. Metoclopramide can cause irreversible tardive dyskinesia. Antidotes to memorize: naloxone (opioids), acetylcysteine (acetaminophen), flumazenil (benzodiazepines), protamine (heparin), vitamin K (warfarin), Digibind (digoxin), calcium (calcium channel blocker overdose), sodium bicarbonate (tricyclic antidepressant overdose). Patient education is critical: never double doses of allopurinol, take bisphosphonates correctly, avoid alcohol with metronidazole and disulfiram, and report muscle pain with statins (rhabdomyolysis risk). In summary, the D441 OA emphasizes safe medication administration, adverse effect recognition, therapeutic monitoring, and patient teaching. Focus on narrow therapeutic index drugs (lithium, digoxin, phenytoin, warfarin), black box warnings (clozapine, lithium, NSAIDs), antidotes, and drug interactions.