When the IV tubing is microdrip, 60 gtt/mL, the drops per minute will be the same as the mL per hour. For example, you have 500 mL to infuse over 12 hours with a microdrip set. The total volume (500 mL), divided by the total time in hours (12), equals 41.6, rounded to 42...
For example, the bromophenol (XIVa) may be transformed into the compounds of formula (IV) by conducting the two steps, outlined above, in reverse order. In this manner, treatment of the said phenol with the tosylate (IX) provides the ether derivatives of formula (XIII). This aryl bromide ...
Number of drops per minute (GTT/min) = input liquid to the total number of ml present [iv total time (h) x 4]Time needed for infusion liquid to the total number of ml (h) = input present (number of drops per minute (4)