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Bloon naltrexone concentration from a single 2.2 g implant vs. repeated Vivitrol injection. 
, Vivitrol – Dose 1; 
, Vivitrol – Dose 2; 
, Vivitrol – Dose 3; 
, Vivitrol – Dose 4; 
, 2.2 g implant – observed; 
, median naltrexone concentration per Vivitor dose; 
, median naltrexone concentration per month from 2.2 g implant
