<unk>  is a Diagnostic Agent that is FDA approved for the diagnosis of lesions and abnormal vascularity in brain, spine, neck, body. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include headache,nausea, injection site coldness/localized coldness, and dizziness.
Gadopentetate
Iopentol
Fomepizole
Metomidate
Codoxime
Thiocarboxime
Methohexital
Metharbital