Sec. 483.045. FORGING OR ALTERING PRESCRIPTION. (a) A person commits an offense if the person: (1) forges a prescription or increases the prescribed quantity of a dangerous drug in a prescription; (2) issues a prescription bearing a forged or fictitious signature; (3) obtains or attempts to obtain a dangerous drug by using a forged, fictitious, or altered prescription; (4) obtains or attempts to obtain a dangerous drug by means of a fictitious or fraudulent telephone call; or (5) possesses a dangerous drug obtained by a forged, fictitious, or altered prescription or by means of a fictitious or fraudulent telephone call. (b) An offense under this section is a Class B misdemeanor unless it is shown on the trial of the defendant that the defendant has previously been convicted of an offense under this chapter, in which event the offense is a Class A misdemeanor. Acts 1989, 71st Leg., ch. 678, Sec. 1, eff. Sept. 1, 1989.