A small amount of morphine and codeine is also manufactured in India for medicinal use.
The remedy most trusted to in this disease is opium and its alkaloids, morphine and codeine.
Tannic acid, for instance, precipitates codeine as a tannate, salts of many of the heavy metals form precipitates of meconates and sulphates, whilst the various alkalis, alkaline carbonates and ammonia precipitate the important alkaloids.
The only alkaloids likely to remain in the prepared opium, and capable of producing well-marked physiological results, are morphine, codeine and narceine.
Morphine, in the pure state, can be sublimed, but codeine and narceine are said not to give a sublimate.