I am not a fan of doxycycline as a biofilm killer. Khella is a Mediterranean herb. It is listed as useful for about ten things, but a biofilm action is new to me. So our huge revised Herbs and Essential Oils for Killing Lyme, Babesia, and Bartonella has significant new herb and biofilm information not in any Lyme doctor posts or lectures.
Source: Fayez Hassan N, Khaled Ibrahim M, Yousef El Tablawy S, Abd Allah Farrag H. Characterization of Biofilm Producer Nanobacteria Isolated from Kidney Stones of Some Egyptian Patients. Pak J Biol Sci. 2021 Jan;24(9):953-970. doi: 10.3923/pjbs.2021.953.970. PMID: 34585548.