Help!translation to Chinese!

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Jan 5, 2018 11:57
"For children 6 to 9: 50 mg, twice daily."
我不懂这句话的意思。I do not know what it means。
一天服用的总量为50 mg,还是服用的总量为100 mg?Taking a total of 50 mg a day, or the total amount of 100 mg?

谢谢!Thanks!