The patient told you that he still feels with a back pain after the administration of sedative drug I.M by an hour, you think that he is lying

The patient told you that he still feels with a back pain after the administration of sedative drug I.M by an hour, you think that he is lying. What is the right action you must take it?
a. Ignore his complain.
b. Inform the Doctor
c. Give him extra dose from drug.
d. Tell him that he is not feel pain and he have delusion.