Table 2.

Collection and recycle of unused drugs in the USA

How are unused drugs collected?	Examples
Drug collection events every several months in accordance with the DEA. The collection is free and anonymous [23].	National drug collection event in September 2015 in different US states [23], Drug collection events in Manitowoc county in Wisconsin state [25], Drug collection events in Illinois [43].
Drug collection on a monthly base	Pharmacies collect non-controlled prescription drugs and OTC medications on the last Saturday of every month in New-York state [24].
Secured drop boxes for drug collection that can be accessed in specific days and times.	Secure drop boxes in New-York state that can be accessed in specific days and times, several such drop boxes are available for the public 24 h a day, seven days a week [24].
Collection by the law enforcement agencies (Sheriff office, police)	In Manitowoc (Wisconsin) there are drug collection drop boxes in police stations [25].
Collection of unused or expired drugs by pharmacies.	Most of the states.