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Baicalein is a flavone, a type of polyphenolic flavonoid, that is extracted from the roots of Scutellaria baicalensis and Scutellaria lateriflora.
Pure baicalin improved lung function in rats suffering from allergic diseases .
When given to asthmatic rats as a pretreatment, baicalin stimulated a healthy remodeling of the airway. Similarly, baicalein reduced airway inflammation, injury, and remodeling in asthmatic mice [2, 3, 4].
In mice with pulmonary hypertension (a progressive condition in which excess of pressure in the lungs leads to their failure), baicalin prevented the development of the condition by reducing pressure and inflammation .
In mice with lung injury caused by a chemotherapeutic drug (bleomycin), a traditional Chinese medicine with skullcap reduced tissue scarring and inflammation .
However, Chinese medicines with skullcap have been reported to cause ARDS in some people .
Traditionally, Chinese skullcap is used to fight off infections, especially respiratory ones. A meta-analysis of 8 clinical trials concluded that the Chinese medicine Shunag Huang Liang may relieve fever, cough, sore throat, and reduce the disease course in acute upper respiratory tract infections. However, the authors warned about the poor quality of the included studies .
Skullcap extract, herbal medicines containing it (KIOM-C and San Wu Huangqin), and its active compound baicalein improved survival and reduced viral load, lung injury, and inflammation in mice infected with the 2009 swine pandemic flu (H1N1). In one of them, baicalein enhanced the effects of the antiviral drug ribavirin [14, 15, 16, 17, 18, 19, 20].
In one cell study, skullcap was more effective in reducing the replication of the swine flu virus than a drug used to treat and prevent it (oseltamivir phosphate) .
In mice with pneumonia caused by the common flu, skullcap root extract reduced inflammation by blocking the production of pro-inflammatory cytokines while stimulating those with an anti-inflammatory effect .
In mice infected with the respiratory syncytial virus (RSV), baicalin reduced viral loads, inflammation, and lung injury .
In chicken with infectious laryngotracheitis virus, a Chinese formula with skullcap (Yinhuangerchen mixture) reduced viral loads, boosted the immune system, and reduced tissue damage .
In test tubes, skullcap extract, herbal medicines containing its root, and active components such as baicalein, baicalin, and wogonin inhibited the following respiratory viruses:
- SARS-CoV-1 
- Flu (H1N1, H3N2, influenza B) [26, 27, 28, 21, 29]
- Human adenovirus III 
- Respiratory syncytial virus (RSV) 
- Newcastle disease virus (a chicken coronavirus) 
- Sendai virus (a parainfluenza virus from mice) 
Other Viral Infections
In a clinical trial on over 700 children with severe foot-and-mouth disease, treatment with Chinese skullcap reduced viral loads and fever, relieved mouth wounds and rashes, and improved neurological symptoms .
Skullcap reduced hepatitis C levels and blocked the virus from replicating in infected mice. Wogonin, its active component, reduced replication of the hepatitis B virus in ducks and improved their liver function [35, 36].
Skullcap extract also reduced inflammation, death rate, and viral replication in mice with heart muscle inflammation caused by coxsackievirus B3. Similarly, its flavonoid oroxylin A reduced viral loads and pancreatic inflammation due to this virus [37, 38].
Skullcap, herbal formulations containing it, and its active components also inhibited the following viruses in test tubes:
- Enterovirus 71 [44, 45]
- Hepatitis B 
- Hepatitis C 
- Duck hepatitis A virus 
- Dengue [49, 50]
- Coxsackievirus B3 
- Epstein-Barr virus 
- Tick-borne encephalitis virus