Do you know what medicine to take if have chicken pox?

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Good evening steemians, I can't sleep because of my brother's condition, he is suffering from chicken pox. Its been 2 days he cants sleep because of itchiness. Do you know some medicine that at least can ease the itchiness?? My brother is already 23 years old he keeps on crying due to his condition

I hope you could help me. Thank you very much