II. Definitions
- Charged elements that bind drugs in the intestinal tract and prevent absorption
III. Mechanism
- Multivalent cations bind medications and form insoluble complexes that cannot be absorbed across gut
IV. Causes: Cations
- Aluminum (e.g. amphojel)
- Magnesium (e.g. Magnesium Oxide, Magnesium Citrate)
- Aluminum-Magnesium Combinations (e.g. Maalox)
- Calcium (e.g. Tums)
- Iron (e.g. iron supplements)
V. Drug Interactions: Decreased Absorption when Cations present
- Tetracyclines
- Fluoroquinolones
- Thyroid medications (e.g. Synthroid)
VI. Management
- Administer medications 2 hours before or 6 hours after cation containing agents
VII. References
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Related Studies
Definition (GO) | Interacting selectively and non-covalently with cations, charged atoms or groups of atoms with a net positive charge. [GOC:jl] |
Concepts | Molecular Function (T044) |
English | cation binding |