Erchen Wan is a greyish-brown to yellowish-brown pill used in Traditional Chinese medicine

Traditional Chinese medicine

Traditional Chinese Medicine refers to a broad range of medicine practices sharing common theoretical concepts which have been developed in China and are based on a tradition of more than 2,000 years, including various forms of herbal medicine, acupuncture, massage , exercise , and dietary therapy...

 to "remove damp-phlegm and regulate the stomach function." It is used in cases where there is "cough with copious expectoration, sensation of stuffiness in the chest and epigastrium, nausea and vomiting due to the stagnation of damp-phlegm."
It is slightly aromatic in odour and tastes slightly pungent and sweet.

Chinese classic herbal formula

Name	Chinese (S)	Grams
Pericarpium Citri Reticulatae	陈皮	250
Rhizoma Pinelliae (processed)	半夏(制)	250
Poria	茯苓	150
Radix Glycyrrhizae	甘草	75