Dosage and Administration for EpiPen® (epinephrine injection, USP) Auto-Injector and Its Authorized Generic

Selection of the appropriate dose of epinephrine is determined according to patient body weight and is described in Table 1. Each EpiPen® or EpiPen Jr® (epinephrine injection, USP) Auto-Injector (or their authorized generics) contains a single dose of epinephrine. Since the doses of epinephrine delivered from EpiPen® and EpiPen Jr® Auto-Injector (or their authorized generics) are fixed, consider using other forms of injectable epinephrine if doses lower than 0.15 mg are deemed necessary. The prescriber should carefully assess each patient to determine the most appropriate dose of epinephrine.1,2

Table 1. Dosing for EpiPen® Auto-Injector and its authorized generic1,2

Auto-Injector Epinephrine Concentration Patient Weight

EpiPen® Auto-Injector

Epinephrine, USP Auto-Injector 0.3 mg

0.3 mg (0.3 mL) ≥30 kg (≥66 pounds)

EpiPen Jr® Auto-Injector

Epinephrine, USP Auto-Injector 0.15 mg

0.15 mg (0.3 mL) 15-30 kg (33-66 pounds)

Prescribing EpiPen® Auto-Injector or its authorized generic

Nearly half of all anaphylactic reactions occur away from home, so consider the multiple settings where a patient may encounter a life-threatening allergen.3

Learn more about prescribing the Epipen® (epinephrine injection, USP) Auto-Injector.

How to use EpiPen® Auto-Injector and its authorized generic

It is important to counsel a patient on the correct administration technique for EpiPen® Auto-Injector and its authorized generic.1,2,4,5 (View a step-by-step video and share it with your patients.) It is also important to counsel the patient that not all epinephrine autoinjectors look and function the same way.

To download the Patient Information for EpiPen® and EpiPen Jr® Auto-Injectors, including complete directions for use, please click here.

To download the Patient Information for the authorized generic to EpiPen®, including complete directions for use, please click here.

When should epinephrine be administered?

The immediate administration of epinephrine is critical for all patients meeting any of the three criteria outlined in the “Anaphylaxis Diagnosis Criteria” section.8,9 Any delay in treatment increases the risk of a life-threatening anaphylactic reaction or a biphasic reaction in these patients.9,10 Some patients not meeting these criteria may still need an immediate injection.8 For example, patients who have had a previous life-threatening anaphylactic reaction and who are exhibiting beginning signs of an allergic reaction after exposure to a known allergen should receive emergency treatment.8 There are no absolute contraindications to epinephrine administration for an anaphylactic reaction.1,2,5 It is important to administer epinephrine immediately.9-11

When a second dose of epinephrine may be warranted

In cases of suboptimal response to the initial dose of epinephrine, or if symptoms progress, the NIAID Expert Panel recommends repeat epinephrine dosing as first-line therapy over adjunctive treatments.4

NIAID food allergy guidelines recommend at-risk patients have access to two epinephrine auto-injectors.4 More than two sequential doses of epinephrine should only be administered under medical supervision.1,2

According to the NIAID food allergy guidelines, there are two reasons that patients should carry two doses of their epinephrine auto-injector.4,10

1. 20% of patients may need a second dose due to ongoing symptoms4,9 Epinephrine—first-line treatment
“If a patient responds poorly to the initial dose or has ongoing or progressive symptoms despite initial dosing, repeated dosing may be required after 5 to 15 minutes. Reports of patients receiving epinephrine for food-induced or non-food-induced anaphylaxis note that as high as 10%-20% of individuals who receive epinephrine will require more than 1 dose before recovery of symptoms.” 4

2. 20% of patients may experience a biphasic reaction4

6.2.3 Time course of food-induced anaphylaxis
“A biphasic reaction includes a recurrence of symptoms that develops after apparent resolution of the initial reaction. Biphasic reactions have been reported to occur in 1%-20% of anaphylaxis episodes and typically occur about 8 hours after the first reaction, although recurrences have been reported up to 72 hours later.” 4

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There’s only one recommended first line treatment for anaphylaxis.

More Important Safety Information (the following information applies to both Epipen and its Authorized Generic)

EpiPen® (epinephrine injection, USP) 0.3 mg and EpiPen Jr® (epinephrine injection, USP) 0.15 mg Auto-Injectors are intended for immediate administration as emergency supportive therapy only and are not intended as a substitute for immediate medical or hospital care. In conjunction with the administration of epinephrine, the patient should seek immediate medical or hospital care. More than two sequential doses of epinephrine should only be administered under direct medical supervision.

EpiPen® and EpiPen Jr® should only be injected into the anterolateral aspect of the thigh. Do not inject intravenously, into buttock, or into digits, hands, or feet. Instruct caregivers to hold the leg of young children firmly in place and limit movement prior to and during injection to minimize risk of injection-related injury.

Rare cases of serious skin and soft tissue infections have been reported following epinephrine injection. Advise patients to seek medical care if they develop symptoms of infection such as persistent redness, warmth, swelling, or tenderness at the injection site.

Epinephrine should be used with caution in patients with heart disease, and in patients who are on drugs that may sensitize the heart to arrhythmias, because it may precipitate or aggravate angina pectoris and produce ventricular arrhythmias. Arrhythmias, including fatal ventricular fibrillation, have been reported, particularly in patients with underlying cardiac disease or taking cardiac glycosides, diuretics, or anti-arrhythmics.

Patients with certain medical conditions or who take certain medications for allergies, depression, thyroid disorders, diabetes, and hypertension, may be at greater risk for adverse reactions. Common adverse reactions to epinephrine include anxiety, apprehensiveness, restlessness, tremor, weakness, dizziness, sweating, palpitations, pallor, nausea and vomiting, headache, and/or respiratory difficulties.

Indications (the following information applies to both Epipen and its Authorized Generic)

EpiPen® and EpiPen Jr® Auto-Injectors are indicated in the emergency treatment of Type I allergic reactions, including anaphylaxis, to allergens, idiopathic and exercise-induced anaphylaxis, and in patients with a history or increased risk of anaphylactic reactions. Selection of the appropriate dosage strength is determined according to body weight.

Click here for Full Prescribing Information for EpiPen.
Click here for Full Prescribing Information for the Authorized Generic for EpiPen


  1. EpiPen [prescribing & patient information]. Morgantown, WV: Mylan Specialty LP; 12/2020.
  2. Epinephrine Injection, USP [prescribing & patient information]. Morgantown, WV: Mylan Specialty LP; 12/2020.
  3. Wood RA, Camargo CA Jr, Lieberman P, et al. Anaphylaxis in America: the prevalence and characteristics of anaphylaxis in the United States. J Allergy Clin Immunol. 2014;133(2):461-467.
  4. Boyce JA, Assa’ad A, Burks AW, et al. Guidelines for the diagnosis and management of food allergy in the United States: report of the NIAID-sponsored expert panel. J Allergy Clin Immunol. 2010;126(6)(suppl):S1-S58.
  5. Simons FE. Anaphylaxis: recent advances in assessment and treatment. J Allergy Clin Immunol. 2009;124(4):625-636.
  6. Simons KJ, Simons FE. Epinephrine and its use in anaphylaxis: current issues. Curr Opin Allergy Clin Immunol. 2010;10(4):354-361.
  7. Ram FSF, Hoare K, Arroll B, Hoare S. Epinephrine self-administration in anaphylactic emergencies: comparison of commonly available autoinjectors. J Asthma Allergy Educ. 2012;3(4):178-181.
  8. Sampson HA, Muñoz-Furlong A, Campbell RL, et al. Second symposium on the definition and management of anaphylaxis: summary report—second National Institute of Allergy and Infectious Disease/Food Allergy and Anaphylaxis Network symposium. J Allergy Clin Immunol. 2006;117(2):391-397.
  9. Simons FE. Anaphylaxis. J Allergy Clin Immunol. 2010;125(2)(suppl 2):S161-S181.
  10. Simons FE, Ardusso LR, Bilὸ MB, et al; World Allergy Organization. World Allergy Organization guidelines for the assessment and management of anaphylaxis. World Allergy Organ J. 2011;4(2):13-37. Lieberman P, Nicklas RA, Randolph C, et al. Anaphylaxis—a practice parameter update 2015. Ann Allergy Asthma Immunol. 2015;115(5):341-384.
  11. Lieberman P, Nicklas RA, Randolph C, et al. Anaphylaxis—a practice parameter update 2015. Ann Allergy Asthma Immunol. 2015;115(5):341-384.
EpiPen® & EpiPen Jr® (epinephrine injection, USP) Auto-Injectors 0.3/0.15mg

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