In general, taking traditional Chinese medicine and drinking tea are not contradictory, as long as there is a half-hour interval between the two. However, there are a few rare exceptions where tea water can be used. For instance, a famous prescription for treating both regular and migraine headaches, called "Chuanxiong Cha Tiao San" (川芎茶调散), is taken with clear tea to deliver the powdered medicine or the decoction. The purpose is to utilize the bitter and cold nature of tea to clear the upper body and guide energy downward, thereby promoting blood circulation to achieve the effect of calming internal wind and relieving pain. However, unless there are special instructions, you should never take Chinese medicine with tea.
Situations where drinking tea is not advisable include the following:
1. When treating gastrointestinal diseases, especially for patients with active peptic ulcers, drinking tea, and particularly strong tea, is not advisable during the medication period. This is because strong tea contains a high amount of caffeine, which can stimulate gastric secretion and affect the healing of ulcers.
2. When taking sedative herbs to calm the mind, drinking tea is not advisable because the caffeine in tea can excite the cerebral cortex, thereby counteracting the therapeutic effect of the sedatives and failing to achieve the treatment goal.
3. When taking nourishing Chinese medicine, drinking tea is not advisable. Tannic acid in tea has an astringent effect that can hinder the body's absorption of nutrients such as protein. At the same time, the tannins in tea can react with the active ingredients in the medicine, weakening the tonic effect. Therefore, when taking tonic herbs like Codonopsis Root (Dangshen), Astragalus Root (Huangqi), or Chinese Yam (Shanyao), drinking tea, especially strong tea, can reduce the medicine's efficacy.
4. The large amount of tannic acid in tea can easily form an insoluble precipitate with alkaloids, preventing the medicine from being absorbed and taking effect. Many active ingredients in Chinese medicines are alkaloids; for example, Ephedra contains ephedrine and pseudoephedrine, Coptis and Phellodendron both contain berberine, and Stemona contains stemonine. Other herbs such as Corydalis, Thistle, Cyathula, and Datura also have alkaloids as their primary active components. Therefore, taking the decoction of these medicines with tea will cause a precipitate, affecting the medicine's efficacy.