(a) A person commits an offense if the person knowingly sells, transfers, or otherwise furnishes a product containing ephedrine to a person 17 years of age or younger, unless:
(1) the actor is:
(A) a practitioner or other health care provider licensed by this state who has obtained, as required by law, consent to the treatment of the person to whom the product is furnished; or
(B) the parent, guardian, or managing conservator of the person to whom the product is furnished;
(2) the person to whom the product is furnished has had the disabilities of minority removed for general purposes under Chapter 31, Family Code; or
(3) the product is a drug.
(b) An offense under this section is a Class C misdemeanor unless it is shown on the trial of the offense that the defendant has been previously convicted of an offense under this section, in which event the offense is a Class B misdemeanor.
(c) A product containing ephedrine that is not described in Subsection (a)(3) must be labeled in accordance with department rules to indicate that sale to persons 17 years of age or younger is prohibited.