Moreover , a few weight - loss drugs have further been classified as dangerous drugs under the dangerous drugs ordinance ( ddo ) ( cap 134 ) and are subject to more stringent control because of their abuse potential . examples are the inclusion of phentermine in 1994 , and amfepramone and cathine in 1999 此外,有些减肥药由于容易被人滥用,因此亦被列为《危险药物条例》下的危险药物,须受到更为严格的管制,例如- -二甲基苯乙基胺在一九九四年被列为危险药物,而二乙胺苯丙酮和去甲麻黄硷则于一九九九年被列为危险药物。