Actor Pete Davidson reportedly has told at Madison Square Garden, where he was warming up the audience for comedian Dave Chappelle’s tour, that he has been using horse tranquilliser—prompting speculation it is part of his treatments for depression.

As per reports, a friend of Davidson’s confirmed he has not just been using “a bit” of the drug. The party substance was approved by the Food and Drug Administration as a nasal spray, which reportedly was the way Davidson was taking it in 2019. It is increasingly common as a way to treat serious depression that hasn’t been improved with typical drugs.