Drug General Information (ID: DDILCNATQR)
  Drug Name Ropivacaine Drug Info Proparacaine (ophthalmic) Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Anesthetics Anesthetics
  Structure

 Mechanism of Ropivacaine-Proparacaine (ophthalmic) Interaction (Severity Level: Moderate)
     Increased risk of methemoglobinemia Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Ropivacaine Proparacaine (ophthalmic)
      Mechanism Methemoglobinemia Methemoglobinemia
      Key Mechanism Factor 1
Factor Name Methemoglobinemia
Factor Description Methemoglobinemia is a condition in which higher than normal levels of methemoglobin are found in the blood. Methemoglobinemia is a potentially life-threatening condition in which the oxygen-carrying capacity of circulating hemoglobin is reduced due to the conversion of some or all of the four iron species from the reduced ferrous (Fe2+) state to the oxidized iron (Fe3+) state.
      Mechanism Description
  • Increased risk of methemoglobinemia by the combination of Ropivacaine and Proparacaine (ophthalmic) 

Recommended Action
      Management Caution is advised when topical anesthetics are used concomitantly with other methemoglobin-inducing agents. Clinicians should be aware of the potential for methemoglobinemia, particularly when topical anesthetics are applied to mucous membranes or given via the oropharyngeal route. Patients or their caregivers should be advised to seek medical attention if they notice signs and symptoms of methemoglobinemia such as slate-grey cyanosis in buccal mucous membranes, lips, and nail beds nausea headache dizziness lightheadedness lethargy fatigue dyspnea tachypnea tachycardia palpitation anxiety and confusion.

References
1 Cerner Multum, Inc. "UK Summary of Product Characteristics.".
2 Guay J "Methemoglobinemia related to local anesthetics: a summary of 242 episodes." Anesth Analg 108 (2009): 837-45. [PMID: 19224791]
3 Product Information. Hurricaine (benzocaine topical). Beutlich, Waukegan, IL.