Covonia Double Action Cough Lozenges Berry Blast 51g Covinia Double Action Cough Lozenges in Berry Blast provide effective, strong & powerful relief for people who are needing cough & throat relief. Covonia Double Action Cough Lozenges soothe your mouth & throat, whilst helping to clear your airways. In the new warming flavour of Berry Blast & also available in Original flavour. The lozenges are suitable for vegetarians & are gluten free.