Tusq DX Sugar Free Syrup is used to treat dry cough. It works by blocking the transmission of nerve signals from the cough centre in the brain to the muscles that produce cough. This medicine may sometimes cause side effects such as dry mouth, throat or nose, drowsiness, blurred vision, constipation, dizziness, and restlessness. Inform the doctor if you are pregnant or breastfeeding, taking any other medication, or have any pre-existing medical conditions.