The present invention is directed toward a method of administering an oral solution containing one or more active ingredients, preferably formulations for non-prescription medicines, vital fluids, and/or nutritional supplements, optimally dosed based upon a patient's weight. The method includes providing an oral solution having an effective amount of one or more active ingredients; determining the weight of the individual, preferably to an individual less than 12 years old; and administrating an appropriate amount of the oral solution in a single dose dispensing unit in accordance with the weight determination of the individual, whereby the total amount of active ingredient administered corresponds to an effective amount of the active ingredient based on the individual's weight.
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