fig1 schematically shows a drug delivery device 50 with a medicine reservoir according to the invention . the drug delivery device 50 is a swallowable capsule comprising a drug to be released somewhere along the gastro - intestinal tract of a patient and an actuation mechanism for controlling the amount of drugs to be released and the moment of said release . although the deformable and removable plug according to the invention is particularly advantageous in combination with swallowable drug delivery devices 50 , it is to be noted that it may also be used with implantable drug delivery devices . the drug to be released is stored in a compressible medicine reservoir 10 . the drug may , e . g ., be stored as dry powder , dissolved in water or as a gel or liquid . an actuator means 12 is provided for compressing the medicine reservoir 10 , resulting in an increase of the pressure inside the medicine reservoir 10 . instead of a compressible medicine reservoir 10 , a rigid reservoir may be used comprising a substance or element which is capable of increasing the pressure inside the reservoir . for example , a balloon filled with a swelling agent may be placed in the rigid reservoir . the medicine reservoir comprises a dispensing hole 15 for allowing the drug to be pushed out of the drug delivery device 50 when the pressure inside the medicine reservoir 10 increases . the actuator means 12 may work mechanically using , e . g ., a piston . alternatively , the actuator means 12 may increase the pressure by sucking in water from the environment or by using chemical reactions for producing water or for expanding a volume of a swelling agent . the drug release may , e . g ., be triggered by an internal clock , sensor values from a ph - sensor or trigger signals from an electrical or chemical detector element . if the drug delivery device 50 comprises means for wireless communication , the drug delivery may be externally triggered . the operation of all electronic functions of the device 50 is controlled by the processing electronics 17 and powered by a battery 16 . fig2 schematically shows ( part of ) a medicine reservoir 10 according to the invention . the medicine reservoir 10 is filled with a drug 13 and is partially enclosed by a housing 11 of the drug delivery device 50 . here , the housing 11 of the drug delivery device 50 is also a wall of the medicine reservoir 10 . alternatively , the medicine reservoir 10 may be a small bag inside the housing 11 . the medicine reservoir 10 is separated from the external environment of the drug delivery device 50 by a dispensing hole 15 in the housing 11 of the device . in this figure , the dispensing hole 15 is blocked by a deformable plug 14 . the plug 14 prevents the drug 13 from leaking out of the medicine reservoir 10 . the plug 14 may comprise an oil which does not mix with the drug 13 or the gastro - intestinal fluid outside the drug delivery device 50 . for example , a mineral oil or castor oil is very suitable for use as a plug 14 . other non - rigid deformable materials may also be used . when the actuator means 12 of the drug delivery device 50 raise the pressure inside the medicine reservoir 10 , the deformable plug 14 will first be compressed and will then be pushed out of the dispensing hole 15 , followed by the first amount of drugs 13 to be released . fig3 shows the medicine reservoir of fig2 with the plug removed . when the actuator means 12 compress the medicine reservoir 10 , drugs 13 are pushed out through the dispensing hole 15 . fig4 shows a medicine reservoir 10 with a nozzle 31 comprising a plug 14 . fig5 shows a cross section of the medicine reservoir of fig4 . the main advantage of the use of the nozzle 31 is that the same drug delivery device 50 and medicine reservoir 10 may be used for different drugs 13 . due to differences in , e . g ., viscosity , different drugs 13 may require dispensing holes 15 with different dimensions ( length and / or diameter ). different nozzles 31 may be designed for different drugs 13 , such that a dispensing hole 15 with optimal dimensions is available for all drug types . a thick gel does , for example , require a relatively wide dispensing hole 15 , while more liquid drugs require very narrow dispensing holes 15 . the hole 15 in the nozzle 31 is filled with a plug 14 as described above . the filled nozzle 31 seals the medicine reservoir 10 . when the first amount of drug 13 is to be delivered and the pressure inside the medicine reservoir 10 increases , the plug 14 is pushed out of the nozzle 31 . the dimensions of the dispensing hole 15 are defined by the design of the nozzle 31 . it should be noted that the above - mentioned embodiments illustrate rather than limit the invention , and that those skilled in the art will be able to design many alternative embodiments without departing from the scope of the appended claims . in the claims , any reference signs placed between parentheses shall not be construed as limiting the claim . use of the verb “ comprise ” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim . the article “ a ” or “ an ” preceding an element does not exclude the presence of a plurality of such elements . the invention may be implemented by means of hardware comprising several distinct elements , and by means of a suitably programmed computer . in the device claim enumerating several means , several of these means may be embodied by one and the same item of hardware . the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage .