👤 By the CinnaEMS Content Team🕐 Updated 2026-09-27🏷️ Clinical Judgment🔖 Free to read, print, and share
Also known as: drug classes · pharmacology · mechanism of action · beta agonist · nitrates · anticoagulants · home medications
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Use this quick-reference guide to recognise, treat and hand over Pharmacology by Class on the NREMT and on the call. Keep it handy during review and on exam day!
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📒 The 1-minute cheat sheet
📌 Receptors
Alpha → vessel tone
Beta-1 → rate, force
Beta-2 → airways open
📌 Cautions
Nitrate + low BP, RV MI, ED drug → no
Opioid + sedative → apnea
🧪 Home Meds
Blood thinner + head strike → high risk
Beta-blocker masks tachycardia
🧪 Every Drug
Six rights
Reassess after each
📚 Pharmacology by Class — full study notes
The cheat sheet above is your quick recall card. These notes go deeper — what it is, what to do first, what changes the plan, and what to hand over.
Thinking in drug classes lets a provider predict effects, side effects and interactions of drugs they have never met. The exam tests the mechanism of each class, what the patient's home medications change about the assessment, and the contraindications that matter in the field.
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Key points
Understand these first
Beta-2 agonists bronchodilate; tachycardia and tremor are expected side effects.
Nitrates dilate veins and lower preload — avoid with hypotension, RV infarct or erectile dysfunction drugs.
Opioids and benzodiazepines depress breathing; combined, the effect is greater.
Anticoagulants and antiplatelets raise bleeding risk — a minor head injury becomes high risk.
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Treatment priorities
What to do, in order
Six rights before every drug: patient, drug, dose, route, time, documentation.
Reassess vital signs and effect after each administration.
Home medication list is part of the history — it suggests diagnoses.
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Red flags — report now
Escalate immediately
Beta-blocker patient with a normal heart rate in shock
Blood thinner with a head strike
Opioid given to a patient already on a sedative
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Patient teaching
What patients must know
Beta-blockers blunt the tachycardia of shock — do not be reassured by a normal rate.
❓ Pharmacology by Class: NREMT FAQs
What are the priority actions for Pharmacology by Class in the field?
Six rights before every drug: patient, drug, dose, route, time, documentation. Reassess vital signs and effect after each administration. Home medication list is part of the history — it suggests diagnoses.
What findings in Pharmacology by Class change your plan or your transport decision?
Beta-blocker patient with a normal heart rate in shock. Blood thinner with a head strike. Opioid given to a patient already on a sedative.
What do I need to know about Pharmacology by Class for the NREMT?
Beta-2 agonists bronchodilate; tachycardia and tremor are expected side effects. Epinephrine: alpha raises vascular tone, beta-1 raises rate and contractility, beta-2 opens airways. Nitrates dilate veins and lower preload — avoid with hypotension, RV infarct or erectile dysfunction drugs. Opioids and benzodiazepines depress breathing; combined, the effect is greater.
What should the crew communicate or document for Pharmacology by Class?
Beta-blockers blunt the tachycardia of shock — do not be reassured by a normal rate.
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Quick Tip
Beta-2 agonists bronchodilate; tachycardia and tremor are expected side effects.