Artesunate is an antimalarial drug used to treat severe malaria. The dosage of artesunate may vary depending on the patient's age, weight, and severity of the disease.

According to Medscape [1], the recommended dosage of artesunate for adults and children weighing more than 20 kg is 2.4 mg/kg intravenously or intramuscularly once a day for three days. For children weighing less than 20 kg, the recommended dosage is 3 mg/kg once a day for three days. The dosage may be adjusted based on the patient's response to treatment.

RxList [2] provides similar dosage information, stating that the recommended dosage of artesunate for adults and children weighing more than 20 kg is 2.4 mg/kg intravenously or intramuscularly once a day for three days. For children weighing less than 20 kg, the recommended dosage is 3 mg/kg once a day for three days.

DrugPatentWatch [3] also confirms the same dosage information for artesunate.

It is important to note that the dosage of artesunate should be determined by a healthcare professional and should be based on the patient's individual needs and medical history. Patients should not adjust their dosage or stop taking artesunate without consulting their healthcare provider.

Sources:
[1] Medscape: Artesunate dosing, indications, interactions, adverse effects, and more. https://reference.medscape.com/drug/artesunate-342684
[2] RxList: Artesunate. https://www.rxlist.com/artesunate-drug.htm
[3] DrugPatentWatch: Artesunate Trademark Details. https://www.drugpatentwatch.com/p/tradename/ARTESUNATE