Hello. Buckwheat belongs to the category of grains, it can be made into a variety of food, buckwheat tea also belongs to the category of tea, when taking medication or not drink tea. Tea with water, many of the substances such as ellagic acid, theophylline, caffeine, theobromine and vitamins will be dissolved in water. When you use tea to deliver some oral medicines, including traditional Chinese medicine, the ingredients in the tea will have a chemical reaction with the medicine, causing the medicine to be ineffective or difficult to be absorbed, so that the therapeutic effect is not achieved. I hope to help you