Abstract
The proverb “Old is gold” is applicable in drug discovery and the
proverb “All that Glitters is not Gold” is also appropriate. In
the COVID-19 era, there has been a race for drugs to be effective against
SARS-CoV-2. There are reports about the uses of Remdesivir and Favipiravir as
existing antivirals against virus but none have been conclusive so far. In the
attempts for innovations, the combination of drugs is also under trials.
Therefore, we used the density functional theory method and quantum theory of
atoms in molecules to investigate drug-drug interactions involving Remdesivir
and Favipiravir. The computed parameters were related to the antiviral actions
of both drugs together. The results indicate enhanced antiviral activity and it
will be worthy to consider additional investigations with the combination of
these two drugs.
Graphical Abstract
Key words
Remdesivir - Favipiravir - Drug–drug interaction - DFT - QTAIM