If you or someone you love carries an epinephrine auto-injector for severe allergies, you already know the drill - the bulky case, the anxiety about the needle, the mental rehearsal of whether you'd actually be able to use it calmly in an emergency. For decades, that was the only option available.
That changed in 2024.
Neffy® is a new kind of emergency allergy treatment - and it's worth understanding, whether you're managing severe allergies yourself or you care for someone who does.
What Is Neffy®?
Neffy® (epinephrine nasal spray) is the first and only needle-free treatment for severe allergic reactions, including life-threatening anaphylaxis, approved by the FDA. Manufactured by ARS Pharmaceuticals, neffy® was approved on August 9, 2024 - and represents the first significant innovation in the delivery of epinephrine in more than 35 years.
In practical terms - it's an epinephrine nasal spray. You insert the tip into one nostril and press. No needle. No injection. No assembly required.
What Is Neffy® Used For?
Neffy® is used for the emergency treatment of Type I allergic reactions, including anaphylaxis. It is available in two weight-based doses: a 2mg dose for adults and children weighing at least 66 pounds, and a 1mg dose for children weighing between 33 and 66 pounds.
Anaphylaxis is a sudden, severe allergic reaction that can affect breathing, blood pressure, and heart rate - and can become life-threatening within minutes. According to the Asthma and Allergy Foundation of America (AAFA), anaphylaxis occurs in about 1 in 50 Americans, with some estimates suggesting the real rate could be as high as 1 in 20.
Common triggers include food allergens (peanuts, tree nuts, shellfish, milk), insect stings, latex, and certain medications. The reaction can happen to anyone - even people who have had mild allergic reactions before.
How Does Neffy® Work?
Neffy® delivers epinephrine - the same medication found in traditional auto-injectors - through the nasal lining and into the bloodstream. Epinephrine works by rapidly constricting blood vessels, opening airways, and reversing the most dangerous effects of anaphylaxis.
The difference with neffy® is the delivery method. Instead of a needle injected into the thigh, it's a nasal spray - making it faster to access, easier to use under stress, and significantly less intimidating for both adults and children.
Neffy® vs EpiPen - What's the Difference?
This is the question most people have when they first hear about neffy®. Here's the honest comparison:
Delivery method - EpiPen uses a needle injected into the outer thigh. neffy® is a nasal spray - no needle, no injection anxiety.
Effectiveness - Neffy® is the first and only needle-free treatment option for patients and families living with severe allergic reactions, offering comparable epinephrine blood concentrations to approved injection products.
Ease of use - Neffy® requires no uncapping, no removal of safety guards, and no injection technique. This matters enormously in a real emergency when hands are shaking and panic sets in.
Who can use it - Both Neffy® and EpiPen require a prescription. Neffy® is approved for adults and children meeting the weight thresholds above.
35 years - Until Neffy®, patients with severe allergic reactions had only one treatment option: an often painful and anxiety-inducing needle injection of epinephrine. neffy® represents the first new delivery method for epinephrine in more than 35 years.
That's not a small thing. For anyone who has ever hesitated to use an auto-injector or watched a child freeze at the sight of a needle - that shift matters.
Neffy® Epinephrine Nasal Spray - Key Facts
A few important things to know about Neffy® as an epinephrine nasal spray for anaphylaxis:
Always carry two doses. According to FARE, more than one dose of epinephrine may be required to effectively treat a severe food allergy reaction. Neffy® comes as a two-pack for exactly this reason. Give the first dose at the first sign of a severe allergic reaction. If symptoms continue or return, give the second dose.
Call 911 immediately. In any emergency, always call 911 first. Neffy® is a bridge - it buys critical time, but emergency medical care is always required after administering epinephrine.
It works quickly. Neffy® delivers epinephrine through the nasal membrane rapidly. If administered correctly at the first signs of anaphylaxis, it begins working within minutes.
Prescription required. Neffy® is available by prescription only. Talk to your allergist or prescribing physician about whether neffy® is the right option for you or your child.
Who Should Know About Neffy®?
Neffy® is relevant for a broader group of people than many realize:
People with known severe allergies - food allergies, insect venom allergies, latex allergies, or medication allergies. If you've been prescribed an epinephrine auto-injector before, ask your doctor whether Neffy® is an option for you.
Parents and caregivers of children with allergies - Neffy® may be significantly easier for a child to tolerate, and easier for a caregiver to administer in a high-stress moment.
School nurses and staff - with anaphylaxis occurring in school settings regularly, 25% of severe allergic reactions in schools occur without a prior diagnosis - meaning staff need to be prepared even for students without known allergies.
Anyone who carries epinephrine - whether for yourself or someone else, understanding your options matters.
Keeping Neffy® Within Reach
Having Neffy® prescribed is only part of the equation. The other part is making sure it's actually with you when a reaction happens.
Like naloxone for opioid overdoses, the biggest barrier to epinephrine working isn't access - it's carriage. People leave their medication in a bag they didn't bring, a car they're not in, or a drawer at home. A carrycase for Neffy® designed for everyday carry - clipped to keys, a backpack, or a belt loop - helps close that gap.
That's exactly what nCase Lite was designed for. nCase Lite is fully compatible with Neffy® - help in keeping your epinephrine nasal spray within reach wherever you go.
One Less Barrier Between You and Safety
Neffy® removes the needle. nCase Lite is designed to help keep it within reach. Together, they make being prepared a little more effortless.
→Learn More About nCase Lite
Frequently Asked Questions
Is Neffy® the same as an EpiPen? No - both deliver epinephrine for anaphylaxis, but Neffy® is a nasal spray while EpiPen is an auto-injector with a needle. They contain the same active medication but use different delivery methods.
Does Neffy® require a prescription? Yes - Neffy® is available by prescription only. Talk to your doctor or allergist about whether it's right for you.
Can Neffy® be used in children? Yes - Neffy® 2mg is approved for children weighing 66 pounds or more. neffy® 1mg is approved for children weighing between 33 and 66 pounds.
What if one dose of Neffy® isn't enough? Give a second dose if symptoms continue or return, and call 911 immediately. Always carry two doses.
