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.
Other derivatives are haemin, haemochromogen and the haematinic acids.
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.
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