Longstanding anxiety around use of epinephrine autoinjectors has prompted research into alternative delivery routes for this life-saving medication. Several companies presented posters on their needle-free epinephrine products at the American Academy of Allergy, Asthma & Immunology (AAAAI) Annual Meeting.
Intranasal formulations are under development at ARS Pharmaceuticals (San Diego, California) and Bryn Pharma (Raleigh, North Carolina). And Aquestive Therapeutics (Warren, New Jersey) is working on a sublingual film that delivers epinephrine prodrug when applied under the tongue.
Epinephrine is essential for stopping life-threatening allergic reactions, yet patients often don't carry their autoinjectors and many hesitate to use them. "It's needle phobia," said ARS Pharmaceuticals CEO Richard Lowenthal in an interview with Medscape Medical News. "They're afraid to use it. They don't like to inject their children, so they hesitate."
Both nasal sprays reached maximal plasma concentration in 20-30 minutes. ARS Pharmaceuticals compared its intranasal product (Neffy 1 mg) against manual intramuscular injection (0.3 mg) and two autoinjectors (EpiPen 0.3 mg and Symjepi 0.3 mg) by analyzing data from multiple randomized crossover Phase 1 studies examining pharmacokinetics and pharmacodynamics in 175 healthy adults. In this integrated analysis, EpiPen was fastest (20 minutes) at reaching maximal concentration (Tmax), followed by Symjepi and Neffy (both 30 minutes) and epinephrine 0.3 mg IM (45 minutes). In a human factors analysis, ARS Pharmaceuticals reported that untrained participants were able to administer the Neffy spray to themselves or another participant safely and effectively during a simulated emergency scenario.
