Is quinine a stimulant, and if it is, how powerful is it compared to caffeine?

It's used as an appetite stimulant. In its many uses I can't find anything that indicates it has any effects like caffeine does. Fantastic range of things it can be used for, though. And it's making a comeback against malaria - it seems to deal with some strains that are resistant to the synthetic quinine. Too much can be dangerous, however, so do read the label and check this site http://www.rain-tree.com/quinine.htm