In 2013, tacrolimus was approved in Japan for the treatment of interstitial lung disease (ILD) in patients with polymyositis (PM)/dermatomyositis (DM).1 Subsequently, Kuwana et al2 reported the 2-year interim prospective results of a postmarketing surveillance study, which found that tacrolimus-containing immunosuppressive regimens were well tolerated in patients with PM/DM-associated ILD.2.