The present invention relates to a method for combating chemical submission, which comprises: putting into solution, in a beverage, a pharmaceutical form comprising an active ingredient and at least 0.05 mg, preferably from 0.2 to 5 mg, even more preferentially from 0.3 to 2 mg of at least one water-soluble colouring agent chosen from: indigocarmine or E 132, erythrosine or E 127, brilliant blue FCF, alphazurine FG, fast green FCF, quinzarine green SS, orange II, tartrazine and Sunset yellow FCF, detecting the pharmaceutical form, said detection being characterized by the immediate change in colour of the beverage it also relates to the use of said colorant for combating chemical submission, and also to a non-film-coated solid pharmaceutical form comprising said colorant.
