Quotation from: Manual of Surgery

Written by: Alexander Miles and Alexis Thomson


The second of these objects has been achieved by the researches of
Ehrlich, who, in conjunction with his pupil, Hata, has built up a
compound, the dihydrochloride of dioxydiamido-arseno-benzol, popularly
known as salvarsan or "606." Other preparations, such as kharsivan,
arseno-billon, and diarsenol, are chemically equivalent to salvarsan,
containing from 27 to 31 per cent. of arsenic, and are equally
efficient. The full dose is 0.6 grm. All these members of the "606"
group form an acid solution when dissolved in water, and must be
rendered alkaline before being injected. As subcutaneous and
intra-muscular injections cause considerable pain, and may cause
sloughing of the tissues, "606" preparations must be injected
intravenously. Ehrlich has devised a preparation--neo-salvarsan, or
"914," which is more easily prepared and forms a neutral solution. It
contains from 18 to 20 per cent. of arsenic. Neo-kharsivan,
novo-arseno-billon, and neo-diarsenol belong to the "914" group, the
full dosage of which is 0.9 grm. As subcutaneous and intra-muscular
injections of the "914" group are not painful, and even more efficient
than intravenous injections, the administration is simpler.

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