Table 2 Collection and recycle of unused drugs in the USA

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.