The card does not speak about sugar and sweeteners. The composition names only ginger (Zingiber officinalis), liquorice (Glycerrhiza Glabra), emblica (Emblica officinalis) at 10 mg each and menthol; there is no full list of excipients. The blueberry flavour is also not explained in the composition.
General information (not a manufacturer's instruction): those who watch their sugar should check the full composition on the packaging.