Acetylcysteine ​​is a drug commonly used to treat coughs with phlegm and is easily purchased, without a prescription at pharmacies with many different brands, many different forms of use suitable for different subjects from children to adults. However, do not abuse the drug.

Cysteine is a semi-essential amino acid synthesized from methionine and serine. It is found in most protein-rich foods, such as chicken, yogurt, cheese, eggs, sunflower seeds, and legumes.