Memory tricks for nursing pharmacology

One of the most elegant mnemonics in nursing — the drug name spells out its own side effects. Respiratory depression is the most dangerous and the priority nursing assessment after administration.

Nearly all beta blockers end in -lol (metoprolol, atenolol, propranolol, carvedilol, labetalol). Block beta-1 (heart) and beta-2 (lungs) receptors. Side effects — BASH: Bradycardia (hold if HR <60), AV block, Bronchospasm (non-selective beta blockers block beta-2 — avoid in asthma/COPD, use a cardioselective beta blocker if needed), Hypotension (hold if SBP <90). Never stop abruptly — taper over 1–2 weeks to avoid rebound hypertension, angina, and MI. Check apical pulse and BP before giving. Masks hypoglycemia — blunts the tachycardia response, so diabetics may not feel a low blood sugar coming. Metoprolol tartrate (immediate-release) vs. succinate (extended-release) — never crush succinate. Labetalol (alpha + beta blocker) is used for hypertensive emergency in pregnancy. Used for: HTN, heart failure (carvedilol, metoprolol — counterintuitive but proven), angina, dysrhythmias, post-MI, migraine prevention.

Anticholinergic drugs block acetylcholine — the "rest and digest" neurotransmitter. ANTI means NOT, so these are all the things your patient CAN'T do. Classic drugs: atropine, diphenhydramine, scopolamine, oxybutynin, tricyclic antidepressants.

Hypothyroidism occurs when the thyroid doesn't produce enough hormones, slowing the entire metabolism. Think of MOM'S SO TIRED as the perfect picture of someone whose body has completely slowed down. Treatment: levothyroxine (synthetic T4).

Isotonic (NS, LR): volume replacement, stays in vessels. Hypotonic (0.45% saline, ½NS): treats hypernatremia, but avoid in increased ICP — pushes water into cells, worsening cerebral edema. Hypertonic (3% saline): severe hyponatremia/cerebral edema, requires ICU monitoring — fluid overload risk. LR contains calcium — never with blood transfusions (clotting risk) or in liver failure (can't metabolize lactate). D5W acts hypotonic once metabolized — not for resuscitation.

Live vaccines (MMR, Varicella, Rotavirus, nasal-spray LAIV flu, Yellow Fever): contraindicated in pregnancy and severe immunocompromise. Two live vaccines: same day or at least 4 weeks apart. Inactivated vaccines (IPV, Hep A/B, injectable flu) are generally safe in pregnancy/immunocompromise. A VIS is legally required before every dose. Observe 15 minutes (30 minutes with prior allergic reaction history) for syncope/anaphylaxis. Report significant events to VAERS.

Take on empty stomach, 30-60 min before breakfast, same time daily. Separate from calcium/iron/antacids by 4+ hours. Elderly/cardiac patients start at 12.5-25 mcg/day (not the standard 1.6 mcg/kg/day) with slower titration — correcting hypothyroidism too fast can precipitate angina or MI. TSH rechecked 6-8 weeks after any dose change, never sooner. Over-replacement signs: tachycardia, tremor, insomnia, weight loss.

Albuterol (SABA) = rescue, works in minutes, for acute symptoms only. Fluticasone/budesonide (ICS) = controller, daily scheduled use, does NOT help an acute attack. When both are ordered together: bronchodilator FIRST, then corticosteroid — opens airways so the steroid penetrates deeper. Rinse and spit with water after every corticosteroid dose to prevent thrush. Albuterol side effects: tachycardia, tremors, nervousness.

Hyperkalemia is one of the most dangerous electrolyte imbalances — it can cause fatal cardiac arrhythmias. Normal K+ is 3.5–5.0 mEq/L. Causes: renal failure, acidosis, potassium-sparing diuretics, ACE inhibitors. Treatment: calcium gluconate (cardiac protection), insulin + glucose (shift K+ into cells), kayexalate, dialysis.

MACHINE is the companion mnemonic to MURDER — while MURDER teaches the signs and symptoms of hyperkalemia, MACHINE teaches what actually causes it in the first place.

LEAN helps you remember the key emergency drugs nurses must know cold. Each targets a specific crisis situation and must be available for rapid administration.

Lidocaine is generally safe but has a narrow therapeutic window. SAMS helps you recognize toxicity early — symptoms progress from mild neurological changes to seizures if not caught quickly.

TRAMP is your checklist for safe and accurate medication administration. Each step must be verified before giving any medication to any patient, every single time.

SEA CASH helps nurses and patients recognize the serious side effects that oral contraceptives can occasionally cause. These symptoms require immediate medical attention and may indicate clotting complications.

The estrogen in combined oral contraceptives raises clot risk. ACHES lists the five warning signs a patient on the pill must report right away. Each one can mean a clot or another serious complication.

IDEA helps you recall four drugs used when heart rate and blood pressure drop dangerously low (atropine first; isoproterenol is a second-line, non-ACLS option). Each works through a different mechanism — knowing which to reach for first is critical in emergencies.

Thiazides are the most commonly prescribed oral diuretics. CHIC helps you remember the four conditions they are used to treat — a high-yield NCLEX topic especially for hypertension management.

These four drugs aren't a formal drug class — each comes from a different category on the Vaughan Williams classification system. They're grouped here because they're the four antiarrhythmics you'll most often reach for at the bedside or code cart to treat ventricular arrhythmias. Amiodarone is currently the most widely used, but all four may appear on NCLEX and in clinical practice.

Statins (atorvastatin, simvastatin, rosuvastatin — the "-statin" suffix) block HMG-CoA reductase, the liver enzyme that makes cholesterol, lowering LDL and slowing plaque buildup. Cholesterol synthesis peaks overnight, so older/shorter-acting statins are dosed in the evening (newer long-acting ones like atorvastatin are more flexible). Two things to teach every patient: report unexplained muscle pain or weakness immediately — it can signal myopathy progressing to rhabdomyolysis — and avoid grapefruit juice, which raises statin blood levels. Baseline LFTs, then only if liver symptoms develop. Usually stopped in pregnancy; avoid while breastfeeding.

Dihydropyridines (amlodipine, nifedipine — the "-dipine" suffix) primarily relax vascular smooth muscle, treating hypertension; watch for peripheral edema and reflex tachycardia. Non-dihydropyridines (verapamil, diltiazem) also slow AV conduction and heart rate, so they treat arrhythmias too — but they're contraindicated in bradycardia or heart block, and verapamil is notorious for causing constipation. Both classes can cause hypotension and, over time, gingival hyperplasia. Grapefruit juice raises blood levels of several CCBs, same as with statins.

Proton pump inhibitors (omeprazole, pantoprazole — the "-prazole" suffix) block the H+/K+ ATPase pump in gastric parietal cells directly, providing the most potent acid suppression available; taken 30–60 minutes before the first meal for best effect. H2 blockers (famotidine — the "-tidine" suffix) block histamine H2 receptors on parietal cells instead, giving faster but less complete acid suppression. Long-term PPI use carries real risks worth teaching: increased C. difficile infection risk, vitamin B12 deficiency, and increased fracture risk from reduced calcium absorption — plus rebound acid hypersecretion if stopped abruptly after long-term use.

Common anticonvulsants include phenytoin, valproic acid, carbamazepine, and levetiracetam. Phenytoin has a narrow therapeutic range (10–20 mcg/mL) requiring regular drug level monitoring, and causes gingival hyperplasia (overgrowth of the gums) with long-term use. Valproic acid requires monitoring for hepatotoxicity. Carbamazepine and lamotrigine carry a risk of Stevens-Johnson syndrome — any new rash must be reported and evaluated immediately, not dismissed. Across the whole class: never discontinue an anticonvulsant abruptly, since doing so can trigger rebound seizures or status epilepticus; and several agents (notably valproic acid) carry neural tube defect risk in pregnancy, making folic acid supplementation and contraception counseling important in patients of childbearing age.

All ACE inhibitors end in -pril (lisinopril, enalapril, captopril, ramipril). Block conversion of angiotensin I → II → less vasoconstriction, less aldosterone → lower BP + less sodium/water retention. Key side effects: Dry hacking cough (most common reason stopped — switch to ARB). Angioedema: life-threatening swelling of airway — STOP immediately, secure airway (epinephrine often works poorly). Hyperkalemia (blocks aldosterone). Teratogenic (boxed warning for fetal toxicity) — never in pregnancy. First-dose hypotension. Check K+ and creatinine.

Digoxin: cardiac glycoside — slows HR (negative chronotrope), strengthens contraction (positive inotrope). Therapeutic level: 0.5–2 ng/mL (0.5–0.9 in heart failure). Toxicity signs — early GI: nausea, vomiting, anorexia. Visual: yellow-green halos around lights (classic). Cardiac: bradycardia, heart block, dysrhythmias. Hypokalemia potentiates toxicity (K+ competes at same receptor). Antidote: DigiFab (digoxin immune fab). Hold if apical pulse <60. Assess K+ before giving. Toxicity treated with: hold drug, K+ replacement, DigiFab for severe.

Vitamin K antagonist — inhibits clotting factors II, VII, IX, X. Monitor INR (not PTT — that's heparin). Therapeutic INR: 2–3 (most indications), 2.5–3.5 (mechanical heart valves). Foods high in Vitamin K (green leafy vegetables) DECREASE warfarin effect — consistent intake, not elimination. Drug interactions: enormous — antibiotics, NSAIDs, many others. Antidote: Vitamin K (slow, oral/IV); major bleeding: 4-factor PCC (Kcentra) + IV Vitamin K. Bleeding precautions: soft toothbrush, electric razor. Hold for procedures. Takes 3–5 days to reach therapeutic level.

Heparin activates antithrombin III → inhibits thrombin and factor Xa. Monitor aPTT (activated partial thromboplastin time) — therapeutic: 60–100 seconds (1.5–2.5× normal of ~40 sec). NOT INR (that's warfarin). Antidote: protamine sulfate. HIT (Heparin-Induced Thrombocytopenia): paradoxical clotting — check platelets. If platelets drop >50% → STOP heparin, switch to argatroban. LMWH (enoxaparin/Lovenox): does NOT require monitoring, give SubQ, do not rub. Overdose signs: bleeding — gums, urine (hematuria), stools (melena).

Opioids (morphine, oxycodone, hydromorphone, fentanyl): bind mu receptors. Side effects — COAT: Constipation (start a stimulant laxative such as senna), Over-sedation, Aspiration risk (nausea/vomiting), respiratory depression (most dangerous). Respiratory depression: RR <12, O2 sat dropping → administer naloxone (Narcan). Tolerance: need more for same effect. Physical dependence: withdrawal if stopped abruptly. Assess pain BEFORE giving, reassess 30–60 min after. Naloxone: short-acting — may need repeat doses. Hold if RR <12.

Pain is the fifth vital sign, and a number alone doesn't say what's wrong. PQRST gives the full picture. Treat by the WHO pain ladder, respect the acetaminophen limit, and always reassess.

Corticosteroids (prednisone, methylprednisolone, dexamethasone): anti-inflammatory, immunosuppressive. Long-term CUSHINGS side effects: Cataracts, Ulcers (PUD — give with food/antacid), Skin thinning/bruising, Hypertension, Immunosuppression (infection risk — no live vaccines), Necrosis (avascular femoral head), Growth suppression (children), Sugar increase (hyperglycemia — monitor blood glucose). Never stop abruptly → adrenal crisis. Taper over weeks. Give in morning (mimics cortisol rhythm). Moon face, buffalo hump, central obesity = Cushing's syndrome.

Loop diuretics (furosemide/Lasix, bumetanide): most potent. Act in loop of Henle. Lose K+, Na+, Mg2+, Ca2+. Monitor K+ — hypokalemia potentiates digoxin toxicity. Ototoxicity (hearing loss) — avoid with other ototoxic drugs. Thiazides (HCTZ, chlorthalidone): act in DCT. Also lose K+. Used for HTN. Potassium-sparing (spironolactone, triamterene): act in collecting duct. KEEP K+ — monitor for hyperkalemia. Spironolactone: anti-aldosterone, used in heart failure. Osmotic (mannitol): draws fluid out of brain — used for cerebral edema. Monitor I&O and daily weights for all diuretics.

Culture before antibiotics — 'culture before cure.' Allergy history: penicillin allergy — about 1–2% cross-reactivity with cephalosporins (lower with newer generations). Anaphylaxis kit at bedside after first dose. Aminoglycosides (gentamicin, tobramycin): nephrotoxic + ototoxic — monitor BUN/creatinine, peak/trough levels. Fluoroquinolones: tendon rupture risk, avoid in children. Tetracyclines: avoid in pregnancy, children <8 (discolors teeth), take with full glass of water, no dairy. Superinfection: C. diff (watery diarrhea after antibiotics — contact precautions), oral thrush. Complete the full course.

Rapid-acting (Lispro/Humalog, Aspart/NovoLog, Glulisine/Apidra): onset 15 min, peak 1–2h, duration 3–4h — give WITH meal or right after. Short-acting (Regular/Humulin R): onset 30–60 min, peak 2–4h, duration 6–8h — the ONLY insulin given IV. Intermediate (NPH/Humulin N): onset 1–2h, peak 6–14h, duration up to 24h — cloudy, gently roll, never shake. Long-acting/basal (Glargine/Lantus, Detemir/Levemir, Degludec/Tresiba): onset 1–2h, no peak, duration 20–24h — NEVER mix with other insulins. When mixing, draw clear before cloudy (Regular before NPH). Hypoglycemia risk is highest at peak time — watch closely then. Hypoglycemia (BS <70): diaphoresis, tremor, confusion — give 15g fast carbs, recheck in 15 min (the 15-15 rule). Insulin sites: rotate — abdomen absorbs fastest.

Naloxone (Narcan): opioid overdose — short-acting, may need repeat. Flumazenil (Romazicon): benzodiazepine reversal — short-acting, seizure risk in benzo-dependent. Protamine sulfate: heparin reversal — 1 mg per 100 units heparin. Vitamin K: warfarin reversal — slow (hours-days). 4-factor PCC (Kcentra): fast warfarin reversal (FFP only if PCC unavailable). DigiFab (digoxin immune fab): digoxin toxicity. N-acetylcysteine (Mucomyst): acetaminophen (Tylenol) overdose — give within 8–10 hr, most effective. Atropine: organophosphate poisoning / bradycardia. Glucagon: beta-blocker or calcium channel blocker overdose.

Antipsychotics EPS (extrapyramidal symptoms) — ADAPT: Akathisia (restlessness), Dystonia (muscle spasm — treat with Benadryl), Akinesia (reduced movement), Parkinsonism, Tardive dyskinesia (late, irreversible — tongue/lip smacking). Neuroleptic Malignant Syndrome (NMS): fever, rigidity, altered LOC — STOP drug. Lithium: therapeutic 0.6–1.2 mEq/L. Toxicity: early — fine tremor, N/V, diarrhea. Toxic — coarse tremor, ataxia, confusion, seizure. Low Na+ increases lithium toxicity (dehydration). Adequate fluid and Na+ intake essential. SSRIs: serotonin syndrome — hyperthermia, agitation, clonus.

SSRIs (selective serotonin reuptake inhibitors): fluoxetine, sertraline, escitalopram, paroxetine, citalopram. SNRIs: venlafaxine, duloxetine. Common side effects: GI upset (nausea — take with food), sexual dysfunction (most common reason for non-compliance), insomnia or sedation, weight changes. Black Box Warning: increased risk of suicidal ideation in children and young adults under 25 — monitor closely in first weeks. Serotonin Syndrome (too much serotonin): HALT — Hyperthermia, Agitation/anxiety, Labile vitals (BP, HR), Tremor/myoclonus/clonus. Triggered by: combining SSRIs + MAOIs (fatal — 14-day washout required), tramadol, triptans, St. John's Wort, linezolid. Treatment: stop offending drug, cyproheptadine, supportive care. Discontinuation syndrome: do NOT stop abruptly — taper. SSRI onset: 2–4 weeks for full effect — teach patient to continue even when not feeling better yet.

Metformin (Glucophage) is first-line for Type 2 DM. Mechanism: decreases hepatic glucose production, improves insulin sensitivity — does NOT cause hypoglycemia alone. Advantages: weight neutral/loss, cardioprotective, inexpensive. Side effects: GI (nausea, diarrhea, metallic taste — take with food), Vitamin B12 deficiency (long-term use). Critical nursing consideration: hold metformin before IV contrast dye (CT, angiography) and before surgery — risk of lactic acidosis if kidneys impaired (contrast can temporarily impair renal function). Restart 48 hours after contrast if renal function normal. Contraindications: eGFR <30 (renal failure), hepatic disease, excessive alcohol use; caution in acute or unstable heart failure (risk of lactic acidosis). Lactic acidosis signs: muscle pain, weakness, GI symptoms, difficulty breathing, dizziness — medical emergency. NCLEX: scheduled for CT with contrast → hold metformin.

High-alert medications have a high risk of causing significant patient harm when used in error. ISMP High-Alert list highlights: IV Potassium chloride (concentrated KCl — NEVER give IV push — cardiac arrest). Insulin (high hypoglycemia risk, dose errors common). Narcotics/opioids (respiratory depression). Chemotherapy (narrow therapeutic index, extravasation risk, dosing errors). Heparin (bleeding, HIT — Heparin-Induced Thrombocytopenia). Also: concentrated electrolytes (hypertonic NaCl), neuromuscular blocking agents (paralysis — must be ventilated), oral methotrexate, anticoagulants (warfarin, DOACs). Safety practices: independent double-check with second nurse, pharmacy verification, standard concentrations, SMART pumps with dose limits, clear labeling, separate storage of concentrated electrolytes. NCLEX: concentrated KCl IV push = fatal, insulin requires second nurse check at most facilities.

Chemotherapy affects all rapidly dividing cells — cancer AND normal. Universal side effects: myelosuppression (neutropenia, anemia, thrombocytopenia — nadir 7–14 days post-chemo), nausea/vomiting (antiemetics before chemo), mucositis (oral/GI ulceration — mouth care), alopecia (reversible), fatigue. Neutropenia precautions (ANC <500): protective/reverse isolation, no fresh flowers/plants, low-bacteria diet, no rectal temps or suppositories, visitors screened. Thrombocytopenia (<50,000): bleeding precautions — soft toothbrush, electric razor, no NSAIDs, fall precautions. Extravasation (vesicant leaks into tissue): stop infusion immediately, leave needle in, aspirate residual drug, apply antidote per protocol, elevate extremity, document, notify provider and pharmacy. Vesicants (most dangerous): vincristine, doxorubicin, taxol. PPE required for nurses handling chemo: gown, gloves (double), eye protection, closed-toe shoes.

Medication errors are the most common cause of preventable patient harm. Medication reconciliation = comparing patient's current medications against new orders at every transition of care. Required at: admission (complete medication history), transfer (unit to unit, OR to floor), discharge (reconcile home meds with new prescriptions). Obtain complete list: prescription drugs, OTC medications, herbals/supplements, vitamins, patches, eye drops, inhalers — patients often forget non-prescriptions. High-risk interactions to catch: herbal + anticoagulants (St. John's Wort decreases warfarin effectiveness), grapefruit juice + statins/calcium channel blockers (increases drug levels), NSAIDs + anticoagulants (GI bleed). The "Five Rights" of medication administration: Right patient (2 identifiers), Right drug, Right dose, Right route, Right time. Expanded: Right documentation, Right reason, Right response. NCLEX: always verify allergies before ANY medication, always use 2 patient identifiers.

Always ask about herbals/supplements — patients don't think of them as "medications." High-yield herbal interactions: The Four G's (all increase bleeding — dangerous with anticoagulants/NSAIDs): Garlic, Ginger, Ginkgo biloba, Ginseng. St. John's Wort: induces CYP450 enzymes → decreases effectiveness of: warfarin, oral contraceptives, digoxin, HIV medications, cyclosporine. Also serotonin syndrome risk with SSRIs. Echinacea: immunostimulant — avoid in autoimmune disease, organ transplant patients. Valerian + kava: sedation — additive with CNS depressants. Saw palmetto: may affect hormone-sensitive conditions. Black cohosh: estrogen-like — avoid in breast cancer. Pre-op assessment: STOP all herbals 2 weeks before surgery — bleeding risk, anesthesia interactions, BP effects. NCLEX: patient on warfarin starts St. John's Wort → INR decreases (under-anticoagulated), DVT/PE risk.

Warfarin (Coumadin) requires constant patient teaching. Vitamin K-rich foods (leafy greens) lower INR — tell patients to keep intake CONSISTENT, not eliminate them. Antidote: Vitamin K (phytonadione). Therapeutic INR for most conditions is 2–3; for mechanical heart valves: 2.5–3.5.

The classic opioid overdose triad: pinpoint pupils (miosis) + unconscious/unresponsive + respiratory rate below 12. Treat immediately with Naloxone (Narcan) IV/IM/IN. Narcan wears off in 30–90 min — patient may re-sedate if opioid has a long half-life. Always monitor post-Narcan.