One Nation Senator Malcolm Roberts (Image: AAP/Lukas Coch)

Australia’s medical regulator is investigating Senator Malcolm Roberts for a Facebook post advertising the services of a doctor who prescribes an unproven and unapproved COVID-19 treatment that the senator has repeatedly promoted.

The Therapeutic Goods Administration confirmed to Crikey it is looking into a June 3 Facebook post on the One Nation senator’s page that directed people to contact a doctor to prescribe ivermectin.

“The TGA is assessing the social media posts and will take action where there has been a breach of the advertising rules. We note that the Facebook post has been removed,” it said.