Tex. Health & Safety Code 483.106(a)
Liability: Administering Opioid Antagonist
An individual who, in good faith, administers an opioid antagonist to a person believed to be suffering from an opioid-related drug overdose will not be held legally responsible or professionally disciplined for acting or failing to act.
Administration of Opioid Antagonist
(a) A person who, acting in good faith and with reasonable care, administers or does not administer an opioid antagonist to another person whom the person believes is suffering an opioid-related drug overdose is not subject to criminal prosecution, sanction under any professional licensing statute, or civil liability, for an act or omission resulting from the administration of or failure to administer the opioid antagonist.