My Mom use to make me a instant chocolate (with a blended up banana) breakfast drink. It worked every time. I think a small milkshake would work great too. (It's not a pill he will be taking every day for the rest of his life) It might be cool to get a treat every time he's sick.
Here is my kids favorite smothie recipe. Or just buy those Instant Chocolate breakfast packets at the store and add milk and half a banana.
INGREDIENTS
8 strawberries, hulled
1/2 cup skim milk
1/2 cup vanilla yogurt
3 tablespoons white sugar
2 teaspoons vanilla extract
6 cubes ice, crushed
DIRECTIONS
In a blender combine strawberries, milk, yogurt, sugar and vanilla. Toss in the ice. Blend until smooth and creamy. Pour into glasses and serve.