Cinnamon and Rhizoma Coptidis in water have the effect of harmonizing the heart and kidneys (heart fire goes down, kidney water goes up, and they control each other). Cinnamon is used as medicine from the dried bark of the plant Cinnamomum cassia. Cinnamon is pungent, sweet and hot in nature, and belongs to the kidney, spleen, liver and heart meridians. It has the effects of inducing fire to return to the source of energy (inhibiting the rising of fire evil from the kidneys), tonifying fire and assisting yang (replenishing yang qi in the body), warming the meridians and channels, dispersing cold and relieving pain (relieving pain by dispelling the cold evil from the body). It should be used with caution in pregnant women and those with bleeding tendency, and is contraindicated in those who are allergic to cinnamon. Huanglian is used as medicine for the dried rhizome of Rhizoma Coptidis, Rhizoma Pinelliae or Rhizoma Pinelliae. Huanglian is bitter and cold in nature, and enters the heart, spleen, liver, stomach, large intestine and gallbladder meridians, and it has the functions of diarrhea and detoxification (dispelling fire and toxicity in the body), and clearing away heat and drying up dampness (clearing away heat and drying up dampness). It is contraindicated for those who are allergic to Rhizoma Coptidis. These two medicines used together have the effect of promoting the heart and kidneys. However, the adverse effects of the above two drugs are not known, in addition, attention needs to be paid to the dosage and ratio of Cinnamon and Rhizoma Coptidis. Cinnamon and Rhizoma Coptidis need to be taken under the guidance of a Chinese medicine practitioner to avoid unauthorized use.