Marcain Polyamp Duofit 0.25% and 0.5% contain Bupivacaine Hydrochloride 2.64 mg/mL and 5.28 mg/mL, respectively, equivalent to bupivacaine hydrochloride anhydrous 2.5 mg/mL and 5.0 mg/mL.
Excipients/Inactive Ingredients: Sodium chloride (tonicity contributor), sodium hydroxide or hydrochloric acid (pH adjustment to 4.0-6.5) and water for injections.