The ferri et quininae citras, one of the "scale preparations" of iron, is given as a haematinic and tonic in doses of about to grains.
Other derivatives are haemin, haemochromogen and the haematinic acids.
Of these iron and ammonium citrate is much used as a haematinic, and as it has hardly any tendency to cause gastric irritation or constipation it can be taken when the ordinary forms of iron are inadmissible.
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