Epipen

Definition

An Epipen is an auto-injector device containing epinephrine, used to manage severe allergic reactions (anaphylaxis). It quickly narrows blood vessels and opens airways in the lungs to improve breathing.

5 Must Know Facts For Your Next Test

1. Epipens deliver a fixed dose of epinephrine, typically 0.3 mg for adults and 0.15 mg for children.
2. Epinephrine acts on both alpha and beta-adrenergic receptors, leading to vasoconstriction and bronchodilation.
3. Common side effects include rapid heartbeat, sweating, dizziness, and anxiety.
4. Epipens should be administered intramuscularly into the outer thigh for rapid absorption.
5. Patients with severe allergies are advised to carry an Epipen at all times and may require a second dose if symptoms persist after the first injection.

Review Questions

• What is the primary function of epinephrine in an Epipen?
• How is an Epipen administered for maximum effectiveness?
• Which adrenergic receptors does epinephrine target when treating anaphylaxis?

Related terms

Adrenergic Receptors: Receptors that respond to adrenaline (epinephrine) and noradrenaline (norepinephrine), involved in fight-or-flight responses.

Bronchodilators: Medications that relax muscle bands that tighten around airways, opening them up and making it easier to breathe.

Anaphylaxis: A severe, potentially life-threatening allergic reaction characterized by swelling, difficulty breathing, and low blood pressure.