Decrease antibiotic action of tetracyclines & quinolones. Decrease absorption of levodopa, levothyroxine, bisphosphonates, methyldopa, penicillamine. Absorption of Fe may be reduced w/ antacids & PPI inhibitors, some food (eg, wholegrain cereals, eggs & milk), oral neomycin (broad-spectrum antibiotic), Ca, Zn, & oral Mg salts, bicarbonates, carbonates, oxalates or phosphates.
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