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YalePharma Conversion Equivalents

      Approximate Exact
    1 milligram 1/60 grain 1/65 grain
    1 gram 15 grains 15.432 grains
    1 kilogram 2.2 pounds* 2.2 pounds*
    1 milliliter 15 minims 16.23 minims
    1 liter 1 quart 1.06 quarts or 33.8 fluid ounces
    1 grain 60 milligrams 65 milligrams
    1 dram 4 grams 3.88 grams
    1 ounce 30 grams 31.1 grams
    1 pound* 450 grams 454 grams
    1 minim 0.06 milliliter 0.062 milliliter
    1 fluid dram 4 milliliters 3.7 milliliters
    1 fluid ounce 30 milliliters 29.57 milliliters
    1 pint 500 milliliters 473 milliliters
    1 quart 1000 milliters 946 milliliters
    1 drop 1 minim  
    1 teaspoonful 5 milliliters  
    1 dessertspoonful 8 milliliters  
    1 tablespoonful 15 milliliters  


    Conversion factors for obtaining approximate equivalents

    To convert To Multiply by
    gr/lb mg/lb 60
    gr/lb mg/kg 143
    mg/lb gr/lb 0.015
    mg/lb mg/kg 2.2
    mg/kg gr/lb 0.007
    mg/kg mg/lb 0.45
    Weights and measures used in prescribing and toxicology
    Weight The Metric System
    1 picogram (pg) 10-12 gram
    1000 picograms 1 nanogram (ng) or 10-9 gram
    1000 nanograms 1 microgram (ug) or 10-6 gram
    1000 micrograms 1 milligram (mg) or 10-3 gram
    1000 milligrams 1 gram (g)
    1000 grams 1 kilogram (kg)
    Volume  
    1000 milliliters (ml) 1 liter (L)


    The Apothecaries' System
    Weight  
    20 grains (gr) 1 scruple ( )
    3 scruples 1 dram( ) = 60 grains
    8 drams 1 ounce ( ) = 480 grains
    Volume  
    60 minims (m) 1 fluid dram ( )
    8 fluid drams 1 fluid ounce ( )
    16 fluid ounces 1 pint (O.)
    Abbreviations
    Abbreviation Meaning Latin
    ad.lib. freely as wanted ad libitum
    aq. water aqua
    b.i.d. twice a day bis in die
    cap. capsule capula
    c with bar on top with cum
    div. divide divide
    eq.pts. equal parts equalis partis
    gtt. a drop gutta
    h. hour hora
    no. number numero
    O. pint octarius
    p.r.n. as occasion requires pro re nata
    q.s. a sufficient quantity quantum sufficiat
    q4h every 4 hours quaque 4 hora
    q6h every 6 hours quaque 6 hora
    q1d every day quaque 1 die
    q1w every week  
    q.i.d. four times a day quater in die
    s.i.d. once a day semel in die
    Sig., S. write on the label signa
    stat. immediately statim
    tab. a tablet tabella
    t.i.d. three times a day ter in die