medicine dropper

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medicine dropper

According to USP XXII, a tube made of glass or other suitable transparent material that generally is fitted with a collapsible bulb and, while varying in capacity, is constricted at the delivery end to a round opening having an external diameter of 3 mm. When held vertically, it delivers water in drops each weighing between 45 mg and 55 mg.

In using a medicine dropper, one should keep in mind that few medicinal liquids have the same surface and flow characteristics as water, and therefore the size of drops may vary considerably from one preparation to another.

When accurate dosing is important, one should use a dropper that has been calibrated for and supplied with the preparation. The volume error incurred in measuring any liquid by means of a calibrated dropper should not exceed 15% under normal use conditions.

See also: dropper
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