Advil is a brand name for ibuprofen, which is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain and reduce inflammation [1]. Echinacea is an herbal supplement commonly used to boost the immune system and treat colds and flu [3].

According to the NHS, ibuprofen can interact with other medicines and herbal supplements, including echinacea [2]. Combining ibuprofen and echinacea may increase the risk of bleeding, as both can thin the blood [2]. Additionally, echinacea may decrease the effectiveness of some medications, including immunosuppressants and some antibiotics [3].

There is no evidence to suggest that combining Advil and echinacea is harmful, but it is important to speak with a healthcare provider before taking any new medications or supplements, especially if you have a medical condition or are taking other medications [2][3].

In summary, combining Advil and echinacea may increase the risk of bleeding and decrease the effectiveness of some medications. It is important to speak with a healthcare provider before taking any new medications or supplements [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ADVIL
[2] https://www.nhs.uk/medicines/ibuprofen-for-adults/taking-ibuprofen-with-other-medicines-and-herbal-supplements/
[3] https://www.webmd.com/vitamins/ai/ingredientmono-981/echinacea