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Interference of iron with the absorption of tetracyclines in man
British Medical Journal
|November 28, 1970
Abstract:
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. Thus even small doses of iron taken simultaneously should be avoided during tetracycline treatment.
Insights
Avoid taking iron supplements with tetracycline antibiotics. Ferrous sulfate significantly reduces the absorption of tetracycline and its derivatives, including oxytetracycline, methacycline, and doxycycline.
Area of Science:
- Pharmacology
- Drug Interactions
- Nutritional Science
Background:
- Tetracyclines are broad-spectrum antibiotics used to treat various bacterial infections.
- Iron supplements are commonly used to treat iron-deficiency anemia.
- Potential interactions between iron and antibiotics require investigation to ensure treatment efficacy.
Purpose of the Study:
- To investigate the impact of ferrous sulfate on the absorption of tetracycline and its derivatives.
- To determine the clinical implications of co-administering iron and tetracycline antibiotics.
Main Methods:
- The study evaluated the absorption of tetracycline, oxytetracycline, methacycline, and doxycycline when administered concurrently with ferrous sulfate.
- The effect of simultaneous administration on antibiotic bioavailability was assessed.
Main Results:
- Ferrous sulfate significantly impaired the absorption of all tested tetracycline antibiotics.
- Even small doses of iron taken concurrently reduced antibiotic effectiveness.
Conclusions:
- Concurrent administration of ferrous sulfate and tetracycline antibiotics should be avoided.
- Patients undergoing tetracycline treatment should refrain from taking iron supplements simultaneously to ensure optimal therapeutic outcomes.