A common unintentional overdose in young children involves multi-vitamins containing iron. Iron is a component of the hemoglobin molecule in blood, used to transport oxygen to living cells.
The most damage I did was to myself and to the people who got caught in the maelstrom. The worst thing that happened was the overdose. But I didn't go in with three other dudes who overdosed with me. No, you overdose alone. Charlie Sheen
The term drug overdose (or simply overdose or OD) describes the ingestion or application of a drug or other substance in quantities greater than are recommended or generally practiced.