Epinephrine is the most frequently pushed drug in a cardiac arrest, and it is also one of the easiest to get slightly wrong. The dose itself is simple - 1 mg, repeated on a clock - but the details around it are where providers stumble under pressure: which concentration to draw up, how the timing changes depending on the rhythm, whether to keep pushing after return of spontaneous circulation (ROSC), and how to avoid the small errors that cost seconds during a code.
This article is built as a practical dosing card, not a debate. If you want the deeper evidence conversation - why epinephrine remains first-line despite mixed neurological outcome data, and how it compares to vasopressin - that discussion lives in our companion piece, Epinephrine vs. Vasopressin in Cardiac Arrest: What the Evidence Says. Here, the goal is narrower and more immediate: get the dose, the route, the timing, and the common mistakes locked into muscle memory before you are standing at the head of a code cart.
Think of what follows as the card you would want taped inside a code cart drawer - short enough to scan mid-code, specific enough to settle an argument about timing, and organized around the moments where providers actually hesitate: drawing up the syringe, deciding whether the rhythm calls for a shock or a drug first, and knowing when to stop pushing boluses once a pulse returns.
For adult cardiac arrest, current American Heart Association Advanced Life Support guidance calls for 1 mg of epinephrine given intravenously or intraosseously, repeated every 3 to 5 minutes for as long as resuscitation continues. There is no cap on the number of doses a patient can receive during a resuscitation attempt - the clock, not a dose ceiling, is what should be governing your next push.
The dose you draw up matters as much as the number on the syringe. Cardiac arrest dosing uses the 1:10,000 concentration (0.1 mg/mL), which delivers 1 mg in a 10 mL prefilled syringe. That is a completely different concentration from the 1:1,000 epinephrine used for intramuscular anaphylaxis dosing, and confusing the two is one of the most dangerous errors in emergency medicine. According to the overview in the NCBI StatPearls review of Advanced Cardiac Life Support, verifying concentration before every push is a standard safety check built into ACLS training for exactly this reason.
Because there is no cumulative dose limit, it can be tempting to treat epinephrine as a drug you can always give "just in case" you are unsure whether the last dose was on time. Resist that instinct. Redosing early does not make the drug work faster, and it does compress the recovery window your patient's circulation needs between pushes. The interval exists for a reason, which is exactly what the next section covers.
Epinephrine earns its place at the top of the code cart because of its alpha-1 adrenergic effect, which causes systemic vasoconstriction. During chest compressions, that vasoconstriction raises aortic diastolic pressure, which in turn raises coronary perfusion pressure - the gradient that actually pushes blood into the heart muscle between compressions. The same mechanism supports cerebral perfusion pressure during CPR, which is part of why the drug is given as early as possible in non-shockable rhythms rather than held back.
The beta-adrenergic effects of epinephrine matter less for the purpose of generating perfusion pressure and are part of why the drug is a double-edged sword - the same properties that support perfusion during compressions can increase myocardial oxygen demand and arrhythmogenicity once a perfusing rhythm returns. That tradeoff is exactly why bolus dosing has no place after ROSC, a point worth remembering now before it becomes a rushed decision later.
Higher-than-standard epinephrine doses are not part of routine adult cardiac arrest management. The narrow exceptions are specific toxicologic presentations, such as cardiac arrest driven by beta-blocker or calcium-channel-blocker overdose, where the treating team may deliberately escalate dosing as part of a toxicology-directed resuscitation strategy. Outside of those specific scenarios, stick to the standard 1 mg dose - reaching for a higher dose "to be safe" is not supported by current guidance and does not improve outcomes in a typical arrest.
A 2-minute CPR cycle is the natural metronome of a code, and epinephrine dosing should be layered onto that rhythm deliberately rather than left to whoever happens to notice the clock. In practice, most teams give epinephrine roughly every other CPR cycle - close enough to the 3 to 5 minute window without requiring a stopwatch calculation mid-compression. A systematic review and meta-analysis of epinephrine administration intervals during adult cardiac arrest found that the interval a team actually achieves - not just the interval written in the algorithm - meaningfully affects resuscitation outcomes, which is one more reason timing deserves the same rehearsal as compressions or airway management.
This is also where a dedicated timekeeper role earns its place on the code team. Assigning one person to track medication timing out loud - "epi due in ninety seconds," "epi given at eighteen fourteen" - removes the guesswork from busy hands. For a deeper breakdown of how drug delivery windows interact with the rest of the algorithm, see ACLS Medication Timing: Why Seconds Matter and How to Master Drug Delivery Windows.
Intravenous access is the preferred route for epinephrine in cardiac arrest. When peripheral IV access cannot be obtained quickly, intraosseous access is an equally acceptable substitute and should not be treated as a fallback of last resort - current guidance places IV and IO on equal footing for drug delivery during resuscitation.
The endotracheal route, once taught as a backup, is rarely used today because absorption through the airway is unpredictable and doses have to be increased substantially to compensate, which introduces its own risk. If IV or IO access is not yet established, the priority is establishing one of those two routes quickly rather than reaching for the endotracheal tube as a medication delivery shortcut. Once the drug is pushed, follow it with a 20 mL saline flush and briefly elevate the extremity - both steps exist to make sure the dose actually reaches central circulation instead of sitting in the line.
IO access deserves a specific mention here because some providers still treat it as inferior to an IV line. For epinephrine delivery during arrest, a well-placed IO line - tibial or humeral - performs the job just as reliably as a peripheral IV, and it is frequently faster to obtain in a patient with poor venous access. If your team is still hesitating between attempting a second IV stick or moving straight to IO, current practice favors moving to IO sooner rather than losing time on repeated venous attempts.
The rhythm on the monitor changes when epinephrine enters the picture, and this is the detail that trips up even experienced providers. In shockable rhythms - ventricular fibrillation and pulseless ventricular tachycardia - defibrillation comes first. Epinephrine is not part of the initial response; it is given once the first defibrillation attempt has failed to convert the rhythm and CPR has resumed, then repeated on the standard 3 to 5 minute interval from there. Reviewing the full sequence alongside our Adult Cardiac Arrest Circular Algorithm makes it easier to see exactly where the first epinephrine dose falls relative to shocks and rhythm checks.
Non-shockable rhythms - pulseless electrical activity and asystole - flip that priority. There is no shock to deliver, so epinephrine becomes the earliest intervention available and should be given as soon as it can be prepared and pushed, ideally within the first few minutes of recognizing the arrest. An observational cohort study on prehospital epinephrine timing in initial non-shockable rhythms reinforces why this earlier administration matters clinically, not just procedurally. If PEA and asystole are rhythms you want to review in more depth, our guide to Understanding Pulseless Electrical Activity (PEA): Causes and Treatment walks through the reversible causes that should be running through your head while that first dose is being drawn up.
Most epinephrine errors in a real code are not knowledge gaps - providers can usually recite the dose correctly in a classroom. They are execution errors that show up under time pressure, noise, and multiple things happening at once. Here are the ones worth drilling until they are automatic.
Anaphylaxis kits and code carts can end up close together in some clinical areas, and grabbing the wrong concentration under stress is a documented source of serious dosing errors. A quick habit that prevents this: say the concentration out loud as you draw up the syringe, every single time, even when you are certain.
A medication pushed into a line that is never flushed can sit there doing nothing while the next cycle of CPR runs. It is a small step that is easy to drop when hands are busy elsewhere, but it directly determines whether the dose you just gave actually reaches the heart.
Because there is no shock to deliver in PEA or asystole, teams sometimes spend the first minutes focused entirely on airway and access while the earliest, most time-sensitive intervention - epinephrine - waits. Access and airway matter, but they should not delay pushing epinephrine the moment it is available.
Without a clearly assigned timekeeper, doses drift - sometimes stacking closer together than 3 minutes, sometimes stretching well past 5. Both extremes matter. Verbalizing the time of the last dose at every rhythm check keeps the whole team oriented, not just the person holding the syringe.
Epinephrine administration should be folded into ongoing compressions, not used as a reason to stop them. Every unnecessary pause in chest compressions reduces coronary perfusion pressure that took the previous cycle to build back up.
Once a pulse returns, the bolus dosing that worked during arrest becomes inappropriate almost immediately - a 1 mg push into a perfusing patient can cause dangerous hypertension and arrhythmia. The next section covers exactly what should replace it.
A case report describing an unintentional high-dose adrenaline administration during resuscitation traced the error back to unclear verbal orders and unlabeled syringes rather than a knowledge gap. Repeating the order back, naming the drug and dose out loud before pushing, and labeling every syringe are simple habits that close that gap.
The code record is not paperwork you catch up on after the fact - it is the tool that lets the team, and whoever reviews the case afterward, reconstruct exactly what was given and when. When documentation lags, the timekeeper loses the reference point needed to call the next dose accurately, and small timing errors compound across a long resuscitation. Recording each epinephrine dose the moment it is pushed, not from memory ten minutes later, keeps both the record and the next dosing decision accurate.
The moment a perfusing rhythm returns, the epinephrine conversation changes completely. Bolus dosing stops, and attention turns to hemodynamic support with a continuous vasopressor infusion titrated to a target mean arterial pressure rather than given as a fixed periodic push.
Epinephrine is one option for that post-ROSC infusion, but it is not the only one, and the choice between epinephrine, norepinephrine, and dopamine depends on the clinical picture in front of you. Our breakdown of Vasopressor Selection in Post-Arrest Care: Choosing Between Norepinephrine, Epinephrine, and Dopamine goes through that decision in detail. The key point for this dosing card is simpler: if you catch yourself reaching for another 1 mg push after a pulse has returned, stop and reassess - that dosing pattern belongs to the arrest phase, not the phase that follows it.
In practical terms, that means the syringe you were using to push boluses gets set aside, and attention shifts to the infusion pump, a working blood pressure cuff or arterial line, and a clearly stated target mean arterial pressure. Building that mental transition into how you rehearse the algorithm - not just reciting it as a rule - is what makes it automatic when a real ROSC happens in the middle of a busy shift.
Use this as the condensed version to keep nearby while you study, and pair it with our full ACLS Medications Cheat Sheet: Dosages, Routes, and Indications for the rest of the code cart.
Reading a dosing card is not the same as being able to execute it at 3 a.m. with a room full of people looking at you. Epinephrine dosing, timing, and the routes discussed here are exactly the kind of material that shows up throughout ACLS certification and recertification coursework, precisely because they are so easy to get right in a classroom and so easy to fumble in practice.
Affordable ACLS was built by practicing, board certified emergency medicine physicians who wanted a certification path that respects how busy clinicians actually study - self-paced, completed on your own schedule, with unlimited retakes if a question catches you off guard. If it has been a while since you last worked through the full arrest algorithm alongside the medication timing covered here, our ACLS Algorithms hub is a good next stop to see exactly where each epinephrine dose fits into the bigger sequence.
Epinephrine will keep being the drug you reach for most often in a code, which is exactly why it deserves this level of precision. Get the dose, the concentration, the interval, and the rhythm-specific timing locked in now, so that on the day it matters, none of it requires a second thought.
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