Why is medication toxicity more likely to occur in neonates than in adults?

Medication toxicity is more likely to occur in neonates primarily due to their immature liver function. In neonates, the liver is still developing and not yet fully capable of metabolizing drugs as efficiently as in adults. This immaturity affects the enzyme systems responsible for drug metabolism, leading to a higher risk of accumulation of medications in their system. As a result, medications that may be safe for adults can pose a significant risk of toxicity in neonates since their bodies may not process these substances adequately.

Neonates also have underdeveloped renal function, which affects excretion, but it is the liver's immaturity that is more critical to understanding their susceptibility to medication toxicity. The other options do not contribute to the increased risk in the same way, as the kidneys, while still maturing, do not lead to the same level of increased toxicity as the immature liver does during this developmental stage.