Polyvalent metal cation

Polyvalent metal cations are positively charged metal ions with a valence of +2 or higher, including essential physiological ions like calcium, magnesium, and iron, as well as toxic elements like lead and aluminum (NIH, 2023). These ions are fundamental to biological life, serving as critical cofactors for over 30% of all enzymes, maintaining the structural integrity of the skeletal system, and acting as secondary messengers in cellular signaling pathways (UniProt; NIH Office of Dietary Supplements). In clinical pharmacology, polyvalent metal cations are targeted by chelating agents such as deferoxamine and penicillamine to treat metal overload diseases like hemochromatosis and Wilson's disease, or to mitigate heavy metal poisoning (PubChem; Mayo Clinic). Additionally, they are a major source of pharmacokinetic drug-drug interactions; they can bind to and form insoluble complexes with various oral medications, including fluoroquinolones, tetracyclines, and integrase inhibitors, thereby significantly reducing their absorption and therapeutic efficacy (FDA; StatPearls). Consequently, the timing of administration for drugs and cation-containing supplements or antacids must be carefully managed to avoid treatment failure (StatPearls).

Other names

Multivalent metal ionsPolyvalent cationsMultivalent cationsMetal cations

Chelation and complexation; therapeutic agents (chelators) bind these cations to form stable, water-soluble complexes for excretion (PubChem), while certain other drugs (e.g., antibiotics) form insoluble complexes with these cations in the gut, which inhibits drug absorption (FDA; StatPearls).