It shall be prohibited for a retailer to sell more than a total of nine grams in tablet or powdered form of ephedrine, pseudo-ephedrine, norpseudoephedrine or phenylpropanolamine to a person within a 30-day period; provided, however, this limit shall not apply to any quantity of such tablet or powdered form of ephedrine, pseudo-ephedrine, norpseudoephedrine or phenylpropanolamine dispensed pursuant to a valid prescription. [Code 2006 § 10-4-4. Ord. 2005-12, 9-27-2005].