<unk>  is a diagnostic agent and radiological contrast media that is FDA approved for the diagnosis of MRI of central nervous system (CNS) and MRI of liver. There is a Black Box Warning for this drug as shown here.  Common adverse reactions include vasodilatation, sensation of hot and cold, nausea, taste sense altered, dizziness, headache and paresthesia.
Gadoversetamide
Dimenhydrinate
Disopyramide
Heptaminol
Picotamide
Pilocarpine 
Levomoramide
Thiomersal