From Anime News Network:

The first Legal Drug series went on hiatus in 2003. Drug & Drop will again follow the lead characters Kazahaya Kudou and Rikuou Himura. The new manga will reveal Kazahaya and Rikuou's pasts as well as the background of Green Drug, the mysterious drugstore where they work.
Chapter name Uploaded Time
vol.3 chapter 19 2016-01-20
vol.3 chapter 18 2016-01-20
vol.2 chapter 17 2016-01-20
vol.2 chapter 16 2016-01-20
vol.2 chapter 15 2016-01-20
vol.2 chapter 14 2016-01-20
vol.2 chapter 13 2016-01-20
vol.2 chapter 12 2016-01-20
vol.2 chapter 11 2016-01-20
vol.2 chapter 10 2016-01-20
vol.2 chapter 9 2016-01-20
vol.1 chapter 8 2016-01-20
vol.1 chapter 7 2016-01-20
vol.1 chapter 6 2016-01-20
vol.1 chapter 5 2016-01-20
vol.1 chapter 4 2016-01-20
vol.1 chapter 3 2016-01-20
vol.1 chapter 2 2016-01-20
vol.1 chapter 1 2016-01-20
vol.1 chapter 0 2016-01-20

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