Alcohol

Alcohol is not a medical treatment, but is frequently used in health-care settings to disinfectant surfaces in order to prevent the transmission of common viruses or bacteria.

Ethyl alcohol
Ethyl alcohol, also known as ethanol, can destroy any virus enveloped in fat, when used in the correct concentrations, including: and some non-enveloped viruses, including:
 * the SARS-CoV-2 coronavirus that causes COVID-19
 * the SARS-CoV virus that causes SARS
 * the different flu viruses
 * Human herpes viruses including the Epstein-Barr virus
 * adenovirus
 * enteroviruses
 * rhinoviruses
 * rotaviruses

Ethyl alcohol is not effective against the hepatitis A virus or polioviruses.

Ethyl alcohol should be used at 60-80% concentrations.

Isopropyl alcohol
Isopropyl alcohol, also known as isopropyl, can destroy any virus enveloped in fat, including the coronaviruses that cause COVID-19, SARS when used in the correct concentration, but unlike ethyl alcohol it cannot inactivate non-enveloped viruses.

Isopropyl is also effective against a variety of bacteria, including:
 * Escherichia coli (e-coli)
 * Staphylococcus
 * Streptococcus

Methanol
Methanol is not used in healthcare settings due to its low effectiveness against bacteria.

Limitations of alcohol disinfectants
Surfaces must be cleaned before disinfecting with alcohol, which will remove the protein-rich materials that alcohol cannot penetrate.https://www.cdc.gov/coronavirus/2019-ncov/prevent-getting-sick/prevention.html

Alcohols are not recommended for sterilizing medical and surgical materials principally because they penetrate protein-rich materials, and they cannot inactivate the spores caused by some forms of bacteria.https://www.cdc.gov/infectioncontrol/guidelines/disinfection/disinfection-methods/chemical.html

Alcohol-based hand sanitizer
Alcohol-based hand sanitizers (ABHS) are effective against many different types of viruses and bacteria; a 60% strength concentration is recommended for the virus causing the 2019-2020 coronavirus pandemic. However, washing hands carefully soap and running water is more effective against coronaviruses, including the coronavirus that causes COVID-19.

Alcohol-based hand sanitizers have limited effectiveness when incorrect technique is used, not enough sanitizer is used, and when they are not used consistently.https://www.ncbi.nlm.nih.gov/books/NBK513254/

Drinking alcohol
Drinking alcohol does not provide protection against coronaviruses, and drinking alcohol frequently or excessively can be extremely dangerous.https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/myth-busters

ME/CFS
A number of different alcohol-based disinfectants are effective against common viruses and bacteria which have been reported to trigger ME/CFS.

Alcohol intolerance is also found in a significant proportion of ME/CFS patients. Some ME/CFS patients also develop mast cell activation syndrome, which involves an intolerance to alcohol and many other substances.

Learn more

 * Disinfection methods: Alcohol - CDC
 * Coronavirus (COVID-19): Prevent getting sick - CDC
 * Products with Emerging Viral Pathogens AND Human Coronavirus claims for use against SARS-CoV-2 - EPA