Alex O'Loughlin undergoing treatment for pain med use

LOS ANGELES, March 2 (UPI) -- Alex O'Loughlin's representative says the Australian actor is undergoing treatment for prescription pain medication use.

O'Loughlin, 35, stars as Steve McGarrett in "Hawaii Five-0" on CBS. His other small-screen credits include "Moonlight" and "Three Rivers."

The actor is expected to miss filming for at least one episode of "Hawaii Five-0" while he undergoes "supervised treatment for prescription pain medication due to a recent shoulder injury," his representative told People.com Friday.

"We respect and support Alex's decision," CBS Television Studios said in a statement. "Everyone at CBS Television Studios and 'Hawaii Five-0' wishes him well and we look forward to his return."