I find this formula very useful for wet type asthma, pediatric asthma, allergic asthma, nasal allergies, food allergies with swelling and asthma and chronic bronchitis, especially when the face appears puffy.
Explaining the Symptom with What We Know for Sure: One must have a good understanding of physiology in order to do this well. Hence, we see thirst as simply the subjective sensation of wanting fluids in the mouth and then let the rest of the diagnosis explain why this is happening.
This formula uses Poria (fú líng). On the one hand Poria (fú líng) will lead and gather the fluids so they can be removed through the urination and on the other hand it will treat the source of the generation of fluids. This is why Poria (fú líng) is the principle herb. The ministers are Zingiberis Rhizoma (gān jiāng) and Asari Radix et Rhizoma (xì xīn) which warm the lung, scatter cold and transform fluids. In order to prevent the Zingiberis Rhizoma (gān jiāng) and Asari Radix et Rhizoma (xì xīn) from squandering and scattering the lung Qi, Schisandrae Fructus (wǔ wèi zǐ) is added as an assistant. Schisandrae Fructus (wǔ wèi zǐ) will restrain the lung Qi and stop cough.
These 5 formulas are incredibly useful in the clinic and once you know them, I am sure you will use them every week, if not every day.