You're telling me!

Adin had an ear infection last week, so he's been (happily) taking medicine ever since. Tonight was the last dose and when he was done, Erik asked if now that Adin was done, could he please have the rest of Adin's medicine? I told him that medicine can help you when you need it, but can hurt you if you take it when you don't need it. Two minutes later, Erik said, "Life is very complicated."