a pharmaceutical implant for administering a biologically active substance is made up of an immediate - release component , preferably containing a disintegrating agent , and a sustained - release component . the implant of the present invention provides flexibility in adjusting the release of the medicament and a faster onset of release can be provided along with a long - term sustained - release . the release rate of the biologically active substance can be adjusted by controlling the relative quantities of the immediate - release component and the sustained - release component .