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Alex O'Loughlin, who plays Steve McGarrett on CBS's reboot of Hawaii Five-0
, is expected to miss filming for at least one episode while he undergoes treatment.
The Australian-born actor, 35, is to "receive supervised treatment for prescription pain medication due to a recent shoulder injury," his rep says.
The popular police show has already shot 19 episodes for the season with production said to be ahead of schedule.
"We respect and support Alex's decision," CBS TV Studios says in a statement. "Everyone at CBS Television Studios and Hawaii Five-0
wishes him well and we look forward to his return."