Method for preparing an at least substantially alcohol-free composition on the basis of at least one plant extract with a secretion and/or expectoration promoting effect, wherein the composition has an alcohol content, particularly an ethanol content, of less than 2 vol.-%, wherein the method comprises the following method stages: (a) provision of at least one alcoholic, especially ethanolic, plant extract with a secretion and/or expectoration promoting effect with a drug/extract ratio in the range of 1:10 to 10:1, wherein the at least one plant extract with a secretion and/or expectoration promoting effect is selected from the group of thyme extract ( Thymus vulgaris), primrose extract ( Primula), ivy extract ( Hedera helix), elderberry extract ( Sambucus nigra), fennel extract ( Foeniculum vulgare), coltsfoot extract ( Tussilago farfara), anise extract ( Pimpinella anisum) and polypody extract ( Polypodium vulgare), and mixtures and combinations of at least two of the aforementioned extracts; and (b) subsequent removal of the alcohol, in particular ethanol, by means of membrane filtration in order to obtain a substantially alcohol-free composition with an alcohol, particularly an ethanol, content of less than 2 vol.-%, based on at least a plant extract with a secretion and/or expectoration promoting effect, wherein at least a dispersing or wetting agent, preferably a solubilizing agent, is added prior to performing the membrane filtration, and/or wherein the membrane filtration is performed in the presence of at least a dispersing or wetting agent, preferably a solubilizing agent, wherein the dispersing or wetting agent is selected from the group of organic oils, fats and fatty acids, lecithins, glycerides and combinations thereof, and wherein the dispersing or wetting agent is used in amounts from 0.1 to 30 wt.-%, based on the total mixture of alcoholic plant extract, additive, water and optionally other ingredients, to be subjected to membrane filtration. (a) provision of at least one alcoholic, especially ethanolic, plant extract with a secretion and/or expectoration promoting effect with a drug/extract ratio in the range of 1:10 to 10:1, wherein the at least one plant extract with a secretion and/or expectoration promoting effect is selected from the group of thyme extract ( Thymus vulgaris), primrose extract ( Primula), ivy extract ( Hedera helix), elderberry extract ( Sambucus nigra), fennel extract ( Foeniculum vulgare), coltsfoot extract ( Tussilago farfara), anise extract ( Pimpinella anisum) and polypody extract ( Polypodium vulgare), and mixtures and combinations of at least two of the aforementioned extracts; and (b) subsequent removal of the alcohol, in particular ethanol, by means of membrane filtration in order to obtain a substantially alcohol-free composition with an alcohol, particularly an ethanol, content of less than 2 vol.-%, based on at least a plant extract with a secretion and/or expectoration promoting effect, wherein at least a dispersing or wetting agent, preferably a solubilizing agent, is added prior to performing the membrane filtration, and/or wherein the membrane filtration is performed in the presence of at least a dispersing or wetting agent, preferably a solubilizing agent, wherein the dispersing or wetting agent is selected from the group of organic oils, fats and fatty acids, lecithins, glycerides and combinations thereof, and wherein the dispersing or wetting agent is used in amounts from 0.1 to 30 wt.-%, based on the total mixture of alcoholic plant extract, additive, water and optionally other ingredients, to be subjected to membrane filtration.