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  1. NLM Digital Collections - Reference-book of practical therapeutics (Volume 2) 
    Publication: New York : Appleton, 1896-97
    resource.nlm.nih.gov/63730290RX2
    ... drachm. The dose is 1 drachm. Aerated pi- perazine water contains 15 grains in each bottle. A ... the only preparation which can be used with safety for internal administration. It is less useful, however, ...
  2. NLM Digital Collections - Review of intramural research (1966) 
    Publication: [Bethesda, Md.] : U.S. Dept. of Health, Education, and Welfare, Public Health Service, National Institutes of Health
    resource.nlm.nih.gov/0141176X6
    ... and trifluoroperazine, which do not have a pi- perazine moiety in their molecular structure, have demonstrated only ... be prepared for new demands for standards of safety, pu- rity, and potency of biologies being developed ...