Children who take 10 vitamin D capsules at once may experience a range of adverse reactions, such as nausea, vomiting, diarrhea, and other discomforts. The common dosage form of vitamin D is drops, a vitamin-based medication. Vitamin D drops are oral capsules containing 400U of vitamin D per capsule, adults and children generally take 1~2 capsules a day, mainly used for the prevention and treatment of vitamin D deficiency, such as rickets. Children who take 10 vitamin D capsules at once may experience early symptoms such as nausea, vomiting, diarrhea, and loss of appetite. Prolonged overdose may also lead to damage to the body’s tissues and organs, blurred consciousness, gastrointestinal bleeding and other serious effects. Vitamin D should be taken in strict accordance with medical advice and should not be taken in excess. Children should use it under adult supervision and keep the drug out of children’s reach to avoid accidental ingestion. In case of overdose, it is recommended to consult a doctor for appropriate treatment.