Epinephrine (adrenaline) is a hormone-based medicine used in emergency situations to treat severe allergic reactions and cardiac arrest.
It is commonly used for:
• Anaphylaxis: Treats severe, life-threatening allergic reactions causing difficulty breathing and swelling.
• Cardiac arrest: Used in emergency resuscitation to help restart the heart.
• Severe asthma attacks: Used in emergency settings to help open the airways during a severe asthma attack.
• Local anaesthesia support: Combined with local anaesthetics in certain procedures to reduce bleeding and prolong the anaesthetic effect.
Anxiety
Tremors
Rapid heartbeat (Tachycardia)
Sweating
Nausea and vomiting
Epinephrine works by acting on receptors found throughout the body, particularly in the heart, blood vessels, and airways.
It causes blood vessels to narrow, which raises blood pressure and reduces swelling, while relaxing the muscles of the airways to make breathing easier.
Epinephrine also increases heart rate and the force of heart contractions, which is why it is used in emergency situations such as anaphylaxis and cardiac arrest, where a rapid and powerful effect is needed.

Doctor of Medicine

BAMS, FMC, MD Resident
Most side effects are temporary and generally harmless and resolve when discontinuing this medicine. However, if you experience any severe side effects or worsening of any of the symptoms, please consult your doctor.
Frequently asked questions
Epinephrine, also known as adrenaline, is a hormone and neurotransmitter found naturally in the human body. It is used as a medication for managing several conditions, including anaphylaxis, cardiac arrest, and superficial bleeding.
Epinephrine works primarily by stimulating alpha and beta-adrenergic receptors but has no influence on pathways related to steroid hormones, such as the modulation of inflammation or immune responses associated with corticosteroids.
Historically, Epinephrine was used to manage asthma attacks. However, it has largely been replaced by more selective beta-2 agonists in recent times.
Yes, Epinephrine can increase blood pressure by stimulating alpha-adrenergic receptors, causing blood vessels to constrict (vasoconstriction), and beta-adrenergic receptors, which increase heart rate and the force of heart contractions. This dual effect leads to a rise in both systolic and diastolic blood pressure.
Epinephrine is not available over the counter. It is typically administered by a doctor or under their supervision. You should consult your doctor before taking any medication.
Yes, an overdose of Epinephrine can lead to severe hypertension (high blood pressure), cerebral haemorrhage (bleeding in the brain), pulmonary oedema (fluid accumulation in the lungs), and cardiac arrhythmias (irregular heartbeats). Immediate medical attention is required in case of an overdose.
There are no natural alternatives that can substitute for the effects of Epinephrine, especially during emergencies like anaphylaxis or cardiac arrest.

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