Tex. R. Civ. P. 686
Upon the filing of such petition and order not pertaining to a suit pending in the court, the clerk of such court shall issue a citation to the defendant as in other civil cases, which shall be served and returned in like manner as ordinary citations issued from said court; provided, however, that when a temporary restraining order is issued and is accompanied with a true copy of plaintiff's petition, it shall not be necessary for the citation in the original suit to be accompanied with a copy of plaintiff's petition, nor contain a statement of the nature of plaintiff's demand, but it shall be sufficient for said citation to refer to plaintiff's claim as set forth in a true copy of plaintiff's petition which accompanies the temporary restraining order; and provided further that the court may have a hearing upon an application for a temporary restraining order or temporary injunction at such time and upon such reasonable notice given in such manner as the court may direct.
Tex. R. Civ. P. 686