There are many variations of coke such as zero, diet and green.
Coke is a sugary caffeinated drink that is considered a soda and has been around since 1886.
So can guinea pigs drink coke?
No, they cannot drink coke at all.
For two reasons they cannot drink this sugary drink. For one they cannot have fizzy drinks at all as it will hurt their stomach.
And secondly they cannot have anything that is caffeinated as it could possibly kill them.
Therefore please avoid letting your guinea pigs drink coke at all.