Hawaii 5-0 star Alex O’Loughlin will miss at least one episode of the CBS drama to seek drug treatment.

“Alex is taking a short break to receive supervised treatment for prescription pain medication due to a recent shoulder injury,” says his rep.

His absence is not expected to affect production. The drama has filmed 19 episodes and is currently shooting the 20th for CBS. The drama is expected to complete its production order for the season, and is apparently ahead of schedule.

“We respect and support Alex’s decision,” according to a statement from CBS TV Studios. “Everyone at CBS TV Studios and Hawaii 5-0 wishes him well and we look forward to his return.”