30 minutes to 1 hour before meals, morning and evening. Take warm (not cold or hot). For insomnia, the evening dose can be taken 1-2 hours before bed.

Typically prescribed for 2-8 weeks for acute presentations, with reassessment by a practitioner. Chronic deficiency patterns may require longer courses of 2-3 months, often transitioning to the pill form (Gui Pi Wan) for ongoing maintenance.

Favor warm, easily digestible, nourishing foods that support the Spleen: cooked grains (rice, millet, oats), soups and stews, root vegetables, lightly cooked leafy greens, small amounts of lean protein, and warming spices like ginger and cinnamon. Longan fruit and red dates, which echo the formula's ingredients, make excellent additions. Avoid cold and raw foods (salads, ice cream, cold drinks, raw fruit in excess), greasy or deep-fried foods, excessive dairy, and overly sweet or processed foods, as these can burden the Spleen and impair its ability to generate Qi and Blood. Limit coffee and strong tea, which can disturb the Heart Shen this formula is trying to calm. Avoid alcohol, which generates Dampness and Heat. Eat regular meals at consistent times and avoid eating late at night or while anxious or distracted, as these habits weaken the Spleen's digestive function.

Gui Pi Tang is a TCM formula developed during the Ming Dynasty by the renowned herbalist Li Shi Zhen around 1575 AD. It was originally crafted to address ailments related to Qi and Blood Deficiencies.

Gui Pi Tang is recognized as a gentle, tonifying formula. In TCM, it is used to enhance Spleen Qi and Heart Blood. Practitioners often recommend it for conditions such as insomnia, poor memory, anemia, chronic fatigue, and other issues associated with blood and Spleen Qi Deficiency.

Gan Cao (Licorice root) is the herb of greatest concern for drug interactions in this formula. Its active compound glycyrrhizin can cause pseudo-aldosteronism (sodium and water retention with potassium loss), which creates several important interactions:

• Cardiac glycosides (digoxin, digitoxin): Gan Cao can lower serum potassium, increasing sensitivity to cardiac glycosides and raising the risk of toxicity and dangerous arrhythmias. Concurrent use should be avoided or closely monitored.
• Antihypertensive medications: Gan Cao can promote salt and water retention, directly counteracting the effects of blood pressure-lowering drugs.
• Potassium-depleting diuretics (furosemide, thiazides): Combined potassium loss may lead to dangerous hypokalemia.
• Warfarin and other anticoagulants: Gan Cao may reduce warfarin's effectiveness, increasing clotting risk.
• Corticosteroids: Gan Cao can inhibit cortisol metabolism, increasing corticosteroid blood levels and amplifying their side effects.
• Hypoglycemic agents (insulin, sulfonylureas): Gan Cao has glucocorticoid-like effects that may raise blood sugar, counteracting diabetes medications.

Ren Shen (Ginseng) and Huang Qi (Astragalus) can inhibit cytochrome P450 enzymes, potentially slowing the metabolism of drugs with narrow therapeutic windows such as warfarin, midazolam, and amitriptyline. Ren Shen may also interact with MAO inhibitors and could reduce the effectiveness of immunosuppressive drugs through immune-stimulating activity.

Dang Gui (Angelica sinensis) has mild anticoagulant properties and may potentiate the effects of warfarin and other blood-thinning medications, increasing the risk of bleeding.

Patients taking any of the above medications should inform their prescribing physician before using Gui Pi Tang.