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Huang Yao Zi (Dioscorea Bulbifera Tober)

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Neutral Huang Yao Zi (Tuber Dioscoreae Bulbiferae)
Bitter, Neutral
Tuber Dioscoreae Bulbiferae
Tone Marks:
huáng yào zĭ
Yellow Medicine


  • Dissipates Nodules and Reduces Goiter
  • Clears Heat and Toxins
    For snake bite if anti-venom is not available, sore throat, animal bites and cancer of the esophagus, stomach, liver, colon or thyroid
  • Cools Blood and Stops Bleeding
    For hematemesis, hemoptysis, epistaxis and uterine bleeding
  • Stops Cough and Wheezing
    For cough, dyspnea, acute and chronic bronchitis, whooping cough and asthma

Contraindications and Cautions

  • Do not use long term, possible side effects include vomiting, diarrhea, abdominal pain and gastrointestinal discomfort
  • Do not use in patients with hepatic dysfunction including hepatitis or cirrhosis
  • Liver function should be monitored when using this herb

Herb-Drug Interactions

  • This section is being researched, and is not completed.

Toxicity and Overdose

  • This is a toxic herb. Side effects after normal dose include reduced appetite, nausea, and abdominal pain.
  • Overdose leads to burning sensation in the mouth, tongue and throat along with salivation, diarrhea, constricted pupils, dizziness, headache, nausea and vomiting. After 6 days, further symptoms include fatigue, lack of appetite, upper abdominal discomfort, yellow discoloration of the eyes and skin, itching skin as well as liver damage
  • Severe cases can result in jaundice, respiratory distress and toxic hepatitis after long term use.


  • 10-15 grams in decoction (Chen)
  • 6-15 grams in decoction (Bensky)


  • This herb has proven effective against some types of cancer but caution should be used due to the high toxicity