A method for the immediate detection into a drink of a pharmaceutically form illicitly introduced into said drink, said method comprising: * dissolution in a drink of a pharmaceutical form consisting of: - an active principle which modifies the state of consciousness of a patient, - an opacifying agent and particles perceptible in the mouth and floating having a density less than one and a diameter greater than 500 μm, said particles being microgranules comprising a blank support which is insoluble or rendered insoluble in water or in an alcoholic solution by coating with an insoluble polymer or by coating with a lipid material, and possibly a fluorescent agent, - at least one pharmaceutically acceptable excipient, said pharmaceutical form being a solid non-coated pharmaceutical form presented in the form of chewable tablet or orodispersible tablet, said opacifying agent, particles perceptible in the mouth and floating and possibly fluorescent agent enabling the immediate modification of the organoleptic properties of the drink into which said pharmaceutical form is introduced, * detection of the pharmaceutical form in said drink through the immediate modification of the organoleptic properties of the drink, said modification taking place in less than one minute, preferably in less than 30 seconds, still more preferably in less than 15 seconds, from the introduction of the pharmaceutical form in the drink. * dissolution in a drink of a pharmaceutical form consisting of: - an active principle which modifies the state of consciousness of a patient, - an opacifying agent and particles perceptible in the mouth and floating having a density less than one and a diameter greater than 500 μm, said particles being microgranules comprising a blank support which is insoluble or rendered insoluble in water or in an alcoholic solution by coating with an insoluble polymer or by coating with a lipid material, and possibly a fluorescent agent, - at least one pharmaceutically acceptable excipient, said pharmaceutical form being a solid non-coated pharmaceutical form presented in the form of chewable tablet or orodispersible tablet, said opacifying agent, particles perceptible in the mouth and floating and possibly fluorescent agent enabling the immediate modification of the organoleptic properties of the drink into which said pharmaceutical form is introduced, - an active principle which modifies the state of consciousness of a patient, - an opacifying agent and particles perceptible in the mouth and floating having a density less than one and a diameter greater than 500 μm, said particles being microgranules comprising a blank support which is insoluble or rendered insoluble in water or in an alcoholic solution by coating with an insoluble polymer or by coating with a lipid material, and possibly a fluorescent agent, - at least one pharmaceutically acceptable excipient, * detection of the pharmaceutical form in said drink through the immediate modification of the organoleptic properties of the drink, said modification taking place in less than one minute, preferably in less than 30 seconds, still more preferably in less than 15 seconds, from the introduction of the pharmaceutical form in the drink.