There is no scientific evidence available, which suggests that chemicals present in coffee can cure or prevent COVID-19 infection.
Methylxanthines belongs to a unique class of drugs derived from the purine base xanthine, which is produced naturally by both plants and animals. Methylxanthines, Theophylline, and Dyphyllin are used to treat obstruction caused in the airways due to asthma, chronic bronchitis, or emphysema.
However, the Centre for Disease Control and Prevention (CDC) reports that there are no drugs or other therapeutics presently approved by the U.S. Food and Drug Administration (FDA) to cure or prevent COVID-19.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.