A nurse is caring for a client who states he recently purchased lavender oil to use when he gets the flu. The nurse should recognize which of the following findings as a potential contraindication for using lavender?

A. The client takes furosemide twice daily: There is no direct contraindication between furosemide and lavender oil. B. Lavender oil, especially in aromatherapy, can trigger respiratory issues in some individuals, particularly those with asthma. Essential oils can act as irritants and exacerbate bronchospasms, potentially leading to wheezing, coughing, or an asthma attack. Therefore, the nurse should advise caution when using lavender oil in clients with a history of asthma. C. The client takes vitamin C daily: There is no significant interaction between lavender oil and vitamin C. D. While lavender has mild sedative properties, it is not a direct contraindication for clients with a history of alcohol use disorder. However, excessive use of lavender could enhance CNS depression when combined with alcohol, so it should be used with caution.