ACLS medication review is easier when you organize drugs by the clinical problem they are meant to address instead of memorizing a disconnected list of names and doses.
For course preparation, focus first on four questions: What situation is the patient in? What is the medication trying to accomplish? What needs to be reassessed after it is given? What therapies should not be delayed while the team prepares the medication?
Medication Knowledge Is Only One Part of ACLS
The American Heart Association identifies pharmacology as a common ACLS knowledge gap and offers a dedicated ACLS Prep: Pharmacology resource. At the same time, medications do not replace high-quality CPR, appropriate defibrillation, recognition of reversible causes, or effective team performance.
A useful learner mindset is: patient state first, treatment purpose second, medication third.
Epinephrine During Cardiac Arrest
Epinephrine remains a standard vasopressor used during adult cardiac arrest. Current 2025 AHA advanced life support guidance supports epinephrine during cardiac arrest and emphasizes that timing differs depending on the rhythm.
For a shockable rhythm, rapid defibrillation remains the priority. The AHA states that it is reasonable to administer epinephrine after initial defibrillation attempts have failed. That distinction is worth understanding because it prevents learners from allowing medication preparation to distract from a therapy that can directly terminate ventricular fibrillation or pulseless ventricular tachycardia.
For ACLS class, know where epinephrine fits conceptually and be familiar with the current dosing information in your official course materials. Do not rely on an old pocket card or memory from a prior guideline cycle.
Amiodarone and Lidocaine for Refractory VF / Pulseless VT
The 2025 AHA adult advanced life support guidelines state that amiodarone or lidocaine may be considered for ventricular fibrillation or pulseless ventricular tachycardia that remains unresponsive to defibrillation.
For learners, the important point is not simply “antiarrhythmic equals ventricular fibrillation.” These medications occur within an ongoing resuscitation in which CPR quality, defibrillation, vascular access, vasopressor therapy, and identification of reversible causes are still being managed.
During a megacode, avoid allowing drug preparation to create long pauses or disrupt the rhythm of the team.
Atropine and Symptomatic Bradycardia
Atropine belongs to the bradycardia conversation, not the routine cardiac-arrest medication list. Current AHA guidance states that atropine is reasonable in adults with acute bradycardia associated with hemodynamic compromise.
If significant bradycardia persists despite medical therapy, current guidance also addresses alternatives such as pacing and rate-accelerating adrenergic infusions. The bigger ACLS lesson is to determine whether the slow rate is actually producing compromise and to evaluate reversible causes.
Do not treat a heart-rate number in isolation. Pair the rhythm with blood pressure, mental status, signs of shock, ischemic symptoms, heart-failure findings, and the overall clinical picture.
Adenosine and Regular Tachycardias
Adenosine is another medication that learners often memorize without understanding. Its usefulness depends on the rhythm. Current AHA guidance supports adenosine in selected regular tachycardias and notes that it may be considered in a hemodynamically stable adult with a regular monomorphic wide-complex tachycardia when used for treatment or to help clarify the rhythm diagnosis.
That does not mean adenosine should be given to every wide-complex tachycardia. The 2025 guidance specifically warns against its use in unstable, irregularly irregular, or polymorphic wide-complex tachycardia.
This is a good example of why rhythm recognition and patient stability must come before medication recall.
Calcium, Sodium Bicarbonate, and Magnesium Are Not Routine Arrest Drugs
One of the most useful 2025 guideline concepts for learners is what not to give routinely. The AHA states that routine administration of calcium, sodium bicarbonate, and magnesium is not recommended for every adult in cardiac arrest.
These medications may still have roles when a specific reversible cause or special circumstance exists. For example, electrolyte disorders, toxicologic emergencies, and certain dysrhythmias can create very different treatment needs. Review the Hs and Ts and reversible causes alongside your medication study so you understand when a drug is being used for a particular problem rather than as a generic arrest intervention.
Build a Medication Study Table
For each medication in your current ACLS materials, make a four-column study table:
- Clinical situation: What patient or rhythm problem makes me think about this medication?
- Purpose: What physiologic or electrical problem am I trying to influence?
- Major cautions: What situation would make this medication inappropriate or require greater caution?
- Reassessment: What should the team look for after administration?
Then add the current dose and administration details directly from your current AHA course materials. This approach is more durable than memorizing dose numbers without context.
Medication Errors During Megacodes
Common learner errors include preparing a drug before determining the rhythm, giving a medication while a more urgent intervention is delayed, failing to confirm an order, forgetting to report that the medication was administered, and continuing the same plan after the patient’s condition changes.
Closed-loop communication helps. The leader identifies the medication and intended action, the assigned team member repeats the order, administration is confirmed, and the team continues reassessment.
Study Pharmacology With Rhythm Recognition
Medication review works best when paired with ECG practice. Work through the ACLS Rhythm Recognition guide and ask which medication concepts, if any, belong to that clinical situation. Then practice explaining the reason in one sentence.
If you are preparing for testing, also review How to Prepare for an ACLS Megacode and the ACLS Precourse Preparation Checklist.
Use Current Materials
The AHA published its full 2025 CPR and ECC guideline cycle, and current ACLS preparation resources have been updated to reflect the new science. If your medication notes came from an older class, confirm them against your current student materials before using them to prepare.
Need an ACLS course? Visit the LSE ACLS Training Hub to compare Provider, Update / Renewal, and HeartCode hands-on options.
Educational note: This article is intended for course preparation and does not provide patient-specific medication instructions. Medication selection, dosing, contraindications, and administration should follow current official AHA materials, medical direction, institutional policy, and local protocols.
