Lowther was recalled from Triple-A Norfolk on Friday, Jon Meoli of The Baltimore Sun reports.
The lefty has posted a 15.19 ERA in 5.1 innings with the Orioles this season, with all nine runs coming in his last two appearances. He hasn't been remarkable at Triple-A either, where he has a 5.18 ERA and yielded five runs in a four-inning start June 24. Even so, Lowther will be called upon for added bullpen depth while Hunter Harvey (lat) spends time on the injured list.