A decision-making aid (1) for delivering at least one drug to a living being. Said decision-making aid includes a fuzzy logic processor (8) for processing at least one first data item (I2) relating to the living being of interest, and at least one second data item (I1) relating to the drug. The decision-making aid provides an output representing a customised amount of said drug, as well as, in a further embodiment, an output representing a customised method for delivering the drug to the living being requiring same. A drug delivery device including a decision-making aid is also disclosed.
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