Salvia miltiorrhiza does not have the effect of preventing wind-cold and flu. Salvia miltiorrhiza has the effect of activating blood circulation and removing blood stasis, etc. It should be used in accordance with the doctor’s prescription. Salvia miltiorrhiza is a kind of Chinese herbal medicine with a bitter and slightly cold flavor, which has the effects of promoting menstruation and relieving pain, activating blood circulation and removing blood stasis, removing vexation and clearing the mind, and cooling blood and eliminating carbuncles (eliminating carbuncles and swellings by clearing and cooling the blood). It is used in treating chest paralysis (stuffy pain in the chest), heart pain, obstruction in the abdomen (the appearance of tangible or intangible lumps in the abdomen with a feeling of distension and pain), dystocia (pain in the abdomen and ribs), restlessness and insomnia, paralysis by heat (often manifested as burning, pain, redness and swelling of the joints and muscles), dysmenorrhea with menstruation closure, and sores, ulcers, swelling and pain. Therefore, Salvia miltiorrhiza does not have the effect of preventing wind-cold flu. Salvia divinorum is contraindicated for people with excessive menstruation and without blood stasis. Adverse effects of Salvia miltiorrhiza are not clear. It should be used under the guidance of physician, not self-medication. To prevent wind-cold and flu, one should strengthen the body, avoid overwork, and pay attention to increasing or decreasing the clothes when the season changes, so as to prevent cold and keep warm. Pay attention to personal hygiene and indoor ventilation.