Erlong Zuoci Wan is a brownish-black honeyed 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 "replenish the kidney and subdue hyperactivity of the liver." It is used in cases where there is "deficiency of yin of the liver and the kidney marked by tinnitus, impairment of hearing, dizziness and blurred vision."
It is sweet and slightly sour in taste.

Chinese classic herbal formula

Name	Chinese (S)	Grams
Magnetitum (calcined)	磁石(煅)	20
Radix Rehmanniae Preparata	熟地黄	160
Fructus Corni (processed)	山茱萸 (制)	80
Cortex Moutan	牡丹皮	60
Rhizoma Dioscoreae	山药	80
Poria	茯苓	60
Rhizoma Alismatis	泽泻	60
Radix Bupleuri Marginati	竹叶柴胡	20