Cordyceps sinensis, when taken within the prescribed dosage, generally has no significant side effects. Contraindications are that it should not be used by those who have superficial evils (evils on the surface of the muscles), and should not be taken in large quantities or for a long period of time. Cordyceps is sweet in nature, flat, belongs to the lung and kidney meridian, has the effect of tonifying the kidney and benefiting the lung, stopping bleeding and resolving phlegm, clinically, it is often used in the treatment of impotence, spermatorrhea, lumbar and knee pain caused by deficiency of kidney and essence, as well as chronic cough and asthma, labor and hemoptysis. Cordyceps can also be used in combination with other medicines, such as the treatment of cough and phlegm can be used in combination with Radix Panax Ginseng, Fructus Pseudostellariae, Colla Corii Asini, Radix et Rhizoma Seng Di, Ophiopogonis et Rhizoma Ophiopogonis, etc.; the treatment of renal yang insufficiency (lack of yang of the kidneys), the impotence of spermatorrhea of essence and blood deficiency, lumbar and knee pains can be used with Epimedium Brevicornum, Cortex Eucommiae, Morinda citrifolia, etc. Cordyceps is standardized to take, generally no obvious side effects. Those who have superficial evil should not take, should not be taken for a long time, and should not be taken in large quantities, it is recommended to take under the guidance of a doctor.