Each mL contains, in a sterile aqueous solution, 5 mg prochlorperazine as the edisylate, 5 mg monobasic sodium phosphate, 12 mg sodium tartrate, 0.9 mg sodium saccharin, and 0.75% benzyl alcohol as preservative. The air in the cartridges has been displaced by nitrogen gas. Chemically, prochlorperazine edisylate is 2-Chloro-10-[3-(4-methyl-1-piperazinyl) propyll phenothiazine 1, 2-ethanedisulfonate (1:1). It has a molecular weight of 564.13.

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