<p>Care should be taken in patients who may develop Iron overloads, such as those with haemochromatosis, haemolytic anaemia or red cell aplasia. Failure to respond to treatment may indicate other causes of anaemia and should be further investigated. Iron &amp; Zinc chelate with tetracycline and absorption of all three agents may be impaired. The absorption of Zinc may be reduced in the presence of Iron. Absorption of Iron may be impaired by penicillamine and by antacids. Such potential interactions can be reduced by separating the administration of each product by several hours. In patients with renal failure a risk of Zinc accumulation could exist.</p>