Wow, you have me stumped. I looked in many sources and found no drug by the name of "Tridural". Mistakes can be made, so you should take the bottle back to the pharmacy and ask the pharamacist to
1) Verify the medication
2) Give you information about the drug
When it comes to medications, it is best to be sure about the purpose for the drug and the possible side effects.
Dr. Christina Lasich, MD