Lavender Drug Interactions
It is thought that lavender may interact with medications or herbal supplements that cause drowsiness or sedation, such as sleep medications, sedatives, and narcotics. Lavender might increase the sedative effects of such drugs, possibly resulting in significant side effects such as confusion or disorientation, loss of balance and falling, or even difficulty breathing.
Keep in mind that the way you use lavender may increase or decrease your likelihood of experiencing lavender drug interactions. For instance, using a body lotion with a light lavender scent is very unlikely to cause drug interactions, while taking lavender by mouth or applying a strong lavender oil or other product to the skin is more likely to lead to interactions.
If you take any medications (especially medications that cause drowsiness or sedation), it may be a good idea to check with your healthcare provider before using lavender.