There is no authoritative information showing that Calamus has carcinogenic side effects. From the point of view of adverse reactions and contraindications, this product does not have carcinogenic side effects, and no relevant reports have been found in the literature. Acorus calamus is a traditional Chinese medicine with pungent and bitter flavor, warm nature, and enters the heart and stomach meridians. Acorus calamus is the dried rhizome of Acorus calamus in the family of Tennantiaceae, which has the efficacy of opening the orifices, transforming dampness and nourishing the stomach, tranquilizing the spirit and benefiting the will, and is mainly used for treating delirium, distension and pain in the epigastric region, forgetfulness, and tinnitus, and other diseases. The adverse effects of Acorus calamus are not known. It should be noted that this drug is warm in nature, and should not be taken alone for external wind-cold or warmth, heat, yin deficiency, or blood deficiency and heat. The elderly, children, infants and young children can not take the drug for a long time. If there is a need to use the drug, you need a traditional Chinese medicine practitioner to identify and follow the doctor’s instructions to take, do not use on their own.