ICH Q3D element classes

ICH Q3D groups elements by toxicity and likelihood of occurrence: Class 1 (As, Cd, Hg, Pb); Class 2A (Co, Ni, V); Class 2B (e.g. Ag, Au, Ir, Os, Pd, Pt, Rh, Ru, Se, Tl) assessed when intentionally added; Class 3 (e.g. Ba, Cr, Cu, Li, Mo, Sb, Sn) of low oral toxicity.

• Also: Class 1 elements
• Also: Class 2A
• Also: Class 2B
• Also: Class 3 elements