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“ Ferrous sulphate administered together with tetracycline and three of its derivatives—oxytetracycline, methacycline, and doxycycline—was found seriously to impair the absorption of these antibiotics.”
“Excerpt Neuvonen and his associates (1) have recently reported that ferrous sulfate taken by mouth with tetracycline or a tetracycline-derivative can impair the absorption of these antibiotics.”