Legal Drug (合法 ドラッグ, Gōhō Doraggu?) is a manga series by Clamp. The main artist in this serialization is Tsubaki Nekoi, formerly Mick Nekoi. It is published in Japan by Kadokawa Shoten and it is published in English by Tokyopop who have currently released 3 volumes(10/05). The series is also known as Lawful Drugstore or Gouhou Drug in Japan.
The series is currently on hold, as the magazine it was serialized in ceased its publication. What has been released so far is only 1/5 of the intended story. At the 2006 Anime Expo, Clamp director Ageha Ohkawa has explicitly stated that "Clamp will be resuming it in the near future."
TokyoPop posted a reference to Volume 4, however the manga has not, as of June 2008, been continued in Japan nor have any new materials been published.
The four leading characters of Legal Drug appear in CLAMP in Wonderland 2, which is the first time Kakei and Saiga are seen animated (Kazahaya and Rikuo make a brief appearance in the xxxHolic anime, episode 6).