Covonia Double Impact Cough Lozenges Strong Original have a dual action formula. One half warms your throat and mouth while the other releases powerful menthol flavours. To give you the sensation of relief from your cough. Covonia Double Impact Cough Lozenges Strong Original These strong original flavour covonia lozenges are so powerful you can feel them working! They are designed to clear and sooth blocked and sore throats. The lozenges are split into two halves; the brown side works to clear airways, while the white side warms the mouth and throat. They are hand made in a traditional manufacturing process in Yorkshire, UK.