Which of the following is NOT a component of a dental cartridge containing 2% lidocaine with 1:100,000 epinephrine?

2 explanations

1. 

   ragban

   Methylparaben is banned in LA https://www.cda-adc.ca/jcda/vol-68/issue-9/546.pdf

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2. 

   oneguy

   No Methylparaben. Also, potassium metabisulphite instead of sodium metabisulphite in Xylocaine, but it probably varies. http://www.dentsply.com/content/dam/dentsply/pim/manufacturer/Preventive/Anesthesia/Injectable_Anesthesia/Xylocaine_Lidocaine_HCI_and_epinephrine_injection_USP/Xylocaine-PIL-EN-7ax4ikl-en-1405.pdf

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