If a drug or device is in package form, it shall be deemed to be misbranded unless it bears a label containing (1) the name and place of business of the manufacturer, packer, or distributor; and (2) an accurate statement of the quantity of the contents in terms of weight, measure, or numerical count: PROVIDED, That under clause (2) of this section reasonable variations shall be permitted, and exemptions as to small packages shall be established, by regulations promulgated by the director.