“…Preclinical data from rodent studies showed complete absorption of nasal naloxone (bioavailability relative to IV: F% = 101%; Hussain et al, 1984). In first in-human trials, nasal naloxone was found to elicit withdrawal symptoms in opioid-dependent volunteers (Loimer et al, 1992(Loimer et al, , 1994. 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).…”