Never, Never, Never inject any substance which has not been prepared commercially for that intended purpose, or prepared to the same standard, and never do so unless directed by a licensed physician or a person with a comparable level of education in iv drug administration, pharmacology, physiology and pathology.
drugs to be administered by iv or im injection should be completely aseptic (read: not clean, not sanitized; completely azenic/aseptic). under primitive conditions this would probably entail either heat sterilization (when possible, many compounds will decompose into inert or dangerous compounds under heat, intense uv exposure, etc) or antiseptic chemical treatment which is know in the specific case not to be reactive with the compound in question, not to be toxic, or to have been removed afterwards by chemical means. It should be free of potentially dangerous particulate matter such as organic solids and it should be of known purity and molar concentration and precise measurement. this would entail complicated assay proceedures, probably centrifugal separation or plant/fungal extracts, purification/separation of specific compounds from a solution/mixture, and in many cases (such as mycoantibiotics, use of these as precursors to the synthesis of the actual compound to be produces).
I am not a physician, nor even a properly trained chemist. This is not medical advice, but an informed opinion that the extraction, purification and synthesis of pharmocologic compounds requires a trained chemist, a properly equipped laboratory and stringent procedural standards to ensure safety. the safe use thereof depends on the supervision, education, experience and training of a person you are trusting your life and wellbeing to.
in any but the direst of immediate disaster, the field production of drugs without the benefit of a competent lab staff, proper equipment and procedures would be part way to suicidal, and in said emergency, it's going to require more education than some might think.
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