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Nitrofurantoin is sometimes taken on an ongoing basis to prevent bladder infections.
Magnesium supplements might impair the absorption of nitrofurantoin,
so do not take magnesium during the 2 hours before or after your nitrofurantoin dose.
Pronsky Z (ed.). Powers and Moore's food medication interactions, 10th ed. Pottstown, PA: Food-Medication Interactions, 1997: 172.