Herbs that Clear Heat

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What precaution should you take when prescribing Sheng Di Huang (rehmanniae radix) to a patient?

Sheng Di Huang is toxic; contraindicated during pregnancy and breastfeeding
Sheng Di Huang is very sticky and cloying; it may cause digestive problems such as diarrhea, nausea, or abdominal pain
Sheng Di Huang is very warm and drying; overuse may cause heat signs or damage yin
Sheng Di Huang strongly invigorates blood; contraindicated during pregnancy.

Sheng Di Huang is very sweet, sticky, and cloying. It is common to combine it with herbs such as Sha Ren or Chen Pi in order to avoid digestive problems.

Source: Bensky, D. (2004). Chinese Herbal Medicine: Materia Medica. Seattle, WA: Eastland Press. pp. 121 [Q534]