What is Epinephrine Hcl: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 30, 2020

Epinephrine is a powerful hormone naturally produced by the body. As a drug, epinephrine is used in emergencies to reverse the symptoms of severe allergic reactions and other serious health threats. Many patients or their caregivers carry ready-to-inject epinephrine in case of an allergy emergency. At the soonest sign of an allergic reaction, they can inject themselves with epinephrine and then get emergency help. Though familiar as an injection, epinephrine can also be found in inhalers and topical formats.

Epinephrine Hcl overview

BRAND NAMES:

  • Auvi-Q, EpiPen, EpiPen Jr, Orostat, Primatene MIST

Generic Names:

  • Epinephrine

Uses:

  • Treats severe allergic reactions (including anaphylaxis) in an emergency situation. Also increases blood pressure during septic shock or helps restart a stopped heart. Inhaled epinephrine treats asthma attacks. Topical epinephrine is used by dentists to staunch capillary bleeding during dental procedures.

Therapeutic Classes:

  • Anaphylaxis agent, bronchodilator, vasopressor, anesthetic adjunct, alpha- and beta-adrenergic, sympathomimetic agent. catecholamine

Forms:

  • Injection, aerosol, topical liquid

How it’s taken:

  • By injection, inhaled, applied topically to gum tissues

What is Epinephrine Hcl used for?

Epinephrine is used in emergencies as an immediate treatment for severe allergic reactions. Epinephrine can also be used immediately after exposure to prevent severe allergic reactions. Physicians not only use epinephrine for emergency allergy treatment but as an emergency treatment to raise blood pressure in people with septic shock or to restart a stopped heart during resuscitation procedures. Over-the-counter epinephrine inhalers can be purchased as an asthma rescue treatment. Less dramatically, dentists or oral surgeons may use topical epinephrine to stop minor bleeding during medical procedures.

What form(s) does Epinephrine Hcl come in

  • Auto-injector

    • 0.1 mg

    • 0.15 mg

    • 0.3 mg

  • Vial

    • 1 mg/mL

  • Inhaler

    • 0.125 mg/spray

  • Topical liquid

    • 8%

What are common Epinephrine Hcl doses?

  • For allergy reactions:

    • For adults and children weighing 30 kg (66 lbs) or more: 0.3 mg intramuscular or subcutaneous injection into the front of the thigh

    • For children weighing less than 30 kg (66 lbs): 0.15 mg intramuscular or subcutaneous injection into the front of the thigh

    • Additional doses may be necessary

    • After two doses, additional doses must be administered by healthcare professionals

  • For asthma attacks in adults and children 12 years of age and older: 1–2 sprays as needed

  • For low blood pressure due to septic shock: Intravenous infusion administered by a healthcare professional

  • For cardiac arrest: Intravenous or intracardiac (into the heart) injection administered by a healthcare professional

  • For dental procedures: Topical application administered by a dental professional

Common Epinephrine Hcl prescriptions

  • EPINEPHrine
    0.15mg/0.15ml solution auto-injector

  • EPINEPHrine
    0.15mg/0.3ml solution auto-injector

  • EPINEPHrine
    0.3mg/0.3ml solution auto-injector

  • EPINEPHrine
    10ml of 1mg/10ml syringe

  • EPINEPHrine
    10ml of 10mg/10ml vial

  • EPINEPHrine
    10ml of 1mg/ml vial

How to take Epinephrine Hcl

  • Before using epinephrine, read the instructions that come with the medicine.

  • Use epinephrine as instructed.

  • How to give epinephrine injections:

    • Use epinephrine auto-injectors exactly as prescribed. Do not change the dose.

    • Read the Instructions for Use when you first get the auto-injectors.

    • Most auto-injectors include a trainer auto-injector. Practice giving an injection several times with the trainer when you first fill the prescription.

    • Understand the different parts of the auto-injector. The Auvi-Q injector is slightly different than standard pen-shaped auto-injectors.

    • Always carry two auto-injectors. Each auto-injector can only be used once.

    • Keep the auto-injector in its carrier tube or case to protect it from light and damage. 

    • If you accidentally drop it, check for damage or leaks. 

    • Check your injection kits regularly to make sure the liquid has not changed color. Follow the Instructions for Use when examining the medicine. 

    • Do not use the auto-injector if the medicine is discolored, the auto-injector is damaged, or the expiration date has passed.

    • If you are administering the injection to a child, make sure to hold the child’s leg firmly in place and limit movement before and during an injection.

    • When ready to give an injection, remove the auto-injector from the case.

    • The auto-injector should have a safety that needs to be removed before an injection can be given.

    • The injection can be given through clothes.

    • Place the injection end at a 90-degree angle against the middle of the outer thigh.

    • Press down hard and hold it there for the amount of time indicated in the instructions. The amount of time it takes to complete an injection varies between products.

    • When finished, pull the auto-injector straight out from the thigh.

    • Get emergency medical treatment. Bring the used auto-injector(s) with you.

    • Store epinephrine auto-injectors at room temperature in the protective case. Do not expose the auto-injectors to excessive heat or cold.

  • How to use an epinephrine inhaler:

    • Use epinephrine inhalers exactly as prescribed or as instructed on the package directions. Do not use more than advised.

    • New inhalers need to be primed by shaking and spraying them four times.

    • When ready to administer a dose, remove the cap.

    • Shake the inhaler.

    • Breathe out completely.

    • Breathe in deeply and press down the top of the inhaler.

    • Continue to breathe in.

    • Hold your breath as long as you can before breathing out.

    • Wait one minute. If breathing does not improve, take a second dose.

    • Take no more than two doses every four hours.

    • Do not take more than eight inhalations in a 24-hour period.

    • Store the inhaler at room temperature.

    • Do not store the inhaler near flames or in heat higher than 120 degrees.

What to do if you miss a dose of Epinephrine Hcl

  • Epinephrine injections are taken as needed in medical emergencies.

    • If a dose is missed, take it when remembered.

    • Do not administer more than two injections.

    • Get emergency medical care.

  • Epinephrine inhalers are used as needed during an asthma attack.

    • If a dose is missed, take it when remembered if symptoms are still present.

    • Do not take more than two doses every four hours.

Epinephrine Hcl contraindications

  • Epinephrine does not have contraindications.

Epinephrine Hcl warnings

  • Tell any healthcare provider who treats you that you are using this medicine.

  • Your healthcare provider will schedule regular appointments to check the effects of this medicine. Keep all appointments.

  • Before using epinephrine injections or inhalers, talk to a healthcare provider if you are pregnant or breastfeeding.

  • Tell your healthcare provider if you have any medical conditions, particularly:

    • Kidney disease

    • Heart disease

    • High blood pressure

    • Asthma

    • Diabetes

    • Overactive thyroid

    • Parkinson’s disease

    • Adrenal gland cancer

  • Before buying and using epinephrine inhalant, talk to a healthcare provider first if you have any of the conditions listed above or:

    • Any history of hospitalization for asthma

    • Difficulty urinating due to an enlarged prostate

    • Seizures

    • Narrow-angle glaucoma

  • Epinephrine injections can cause serious but rare problems, including:

    • Severe skin infections at the injection site

    • Heart rhythm abnormalities

    • High blood pressure (intravenous injection)

    • Pulmonary edema (intravenous injection)

    • Kidney failure (intravenous injection)

  • When giving an epinephrine injection, NEVER inject the medicine into:

    • The buttocks

    • Hands

    • Feet

    • Fingers

    • Toes

  • When children given epinephrine injections are moving or uncooperative, problems such as cuts, bent needles, and embedded needles are possible. It’s vitally important to hold the child’s leg in place during an injection.

  • Epinephrine injections and inhalers increase the risk of heart attack and stroke in people with high blood pressure or heart disease.

  • A severe allergic reaction is a medical emergency. Go to an emergency room as soon as possible, even if you feel better after you use this medicine.

  • Keep epinephrine securely out of the reach of children.

Epinephrine Hcl interactions

  • To avoid potentially hazardous drug interactions, tell the prescribing healthcare provider about all prescription drugs, over-the-counter medicines, and supplements you are using before taking epinephrine or using an epinephrine inhaler.

  • Tell other healthcare providers you are using this medicine before they prescribe new medications.

  • Do not use epinephrine inhalers if you are taking drugs called monoamine oxidase inhibitors (MAOIs). These drugs need to be stopped for at least two weeks before you can safely use an epinephrine inhaler.

  • Some drug interactions may cause problems. In some cases, epinephrine reduces the effects of those drugs. In other cases, the combination can increase the side effects of epinephrine or the other drug. These problem drugs include:

    • Stimulants

    • Blood pressure medications

    • Some types of heart medications called cardiac glycosides (such as digoxin)

    • Heart rhythm medications

    • Corticosteroids

    • Drugs that treat depression

    • Antihistamines

    • Drugs that make you pee (diuretics)

    • Drugs that treat migraine headaches called ergots

    • Clonidine, doxapram, levothyroxine, oxytocin, phentolamine, theophylline

  • Do not drink caffeine when using epinephrine.

Epinephrine Hcl side effects

Serious side effects

Any use of epinephrine injections must be followed up by emergency medical treatment. Tell any healthcare provider about signs or symptoms of a serious epinephrine side effect, including:

  • Persistent pain, redness, swelling, tenderness, or warmth at the injection site

  • Heavy sweating, nausea, vomiting

  • Fast, pounding, or uneven heartbeat

  • Chest pain, trouble breathing, blue lips and fingernails, swelling in the legs or ankles

  • Decrease in how much or how often you urinate, bloody urine

Epinephrine can cause serious skin infections after use, so talk to a healthcare provider if you experience persistent pain, redness, swelling, tenderness, or warmth at the injection site.

Stop using epinephrine inhalers and talk to a healthcare provider if you experience:

  • Insomnia

  • Fast, pounding, or uneven heartbeat

  • Tremors, shakiness, or seizures

Less serious side effects

  • Feeling anxious, nervous, scared, or weak

  • Fast or irregular heartbeats

  • Sweating

  • Pale skin

  • Shakiness

  • Dizziness

  • Nausea or vomiting

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