In South Africa, it's always safer to stick to brand name colas like Pepsi and Coca-Cola as there are far too many drinks that are labelled ____ Cola or Cola _____ and you really don't know what you're getting until you're on your knees in front of the toilet.
My parents like a brand called Big C Cola which is one of those strange drinks as well as the brands that our local chainstores Shoprite, Checkers and Pick 'n Pay put out. Those give me major stomach pains and way too much gas, so I steer clear of them.