In Si Jun Zi Tang, what is the dosage range for Fu Ling?

• A. 3-6 g
• B. 6-9 g
• C. 9-12 g
• D. 12-18 g

Answer: (B)

The key idea here is balancing qi tonification with dampness regulation in Si Jun Zi Tang. Fu Ling acts to transform dampness and support the spleen, while the other two main tonifying herbs provide the strong qi support. Using a moderate amount of Fu Ling, specifically 6-9 g, achieves this balance: enough dampness regulation to prevent buildup but not so much that it over-drains or unsettles the formula’s gentle tonification.

If Fu Ling were used at a lower dose like 3-6 g, the dampness-transforming action might be too weak to support the qi-tonifying herbs. At higher doses such as 9-12 g or more, the dampness removal could become too strong, risking over-drying and potential side effects like loose stools or fatigue, which would undermine the formula’s purpose. Therefore, 6-9 g is the best fit for harmonizing dampness with qi tonification in this decoction.