ACC Long Effervescent Tablets are used to help thin and loosen mucus in the airways due to certain lung diseases. This effect helps you to clear the mucus from your lungs so that you can breathe easier. How to use Adults and adolescents starting from the age of 14 half effervescent tablets of ACC Long twice a day or one effervescent tablet once a day (corresponds to 600 mg of acetylcysteine per day)