Each 1.2 oz bar contains 50 mg of caffeine and carries the warning that they are not recommended for children, pregnant or nursing women, or people sensitive to caffeine. (bakeryandsnacks.com)
One and a half.5 oz bars makes about two cups. (soulemama.com)
I did not have the Mexican chocolate so I substituted an extra square of semi-sweet chocolate and a 2 - oz bar of of milk chocolate with cinnamon made by a local confectioner, plus about a half teaspoon of extra cinnamon. (epicurious.com)