“…Since the early 2000s, nasal naloxone has been used off-label by ambulance personnel (Barton et al, 2005(Barton et al, , 2002Belz et al, 2006;Kelly et al, 2005;Kerr et al, 2009;Merlin et al, 2010;Robertson et al, 2009;Weber et al, 2012) and in the emergency department (Sabzghabaee et al, 2014). More recently, improvised nasal kits (consisting of a prefilled naloxone syringe and an atomizer which fits onto the syringe to generate a nasal spray) have been provided to opioid users, peers, and families in take-home naloxone trials (Doe-Simkins et al, 2009;Dwyer et al, 2015;Walley et al, 2013aWalley et al, , 2013b, and succesful overdose reversals using improvised nasal kits have also been reported for police first responders (Rando et al, 2015). However, the only published pharmacokinetics study in humans found intranasal naloxone (2mg/5ml) had a relative bioavailability of only 4% (Dowling et al, 2008).…”