The present invention relates to the use of one or more compounds selected from the following: carvacrol, thymol, curcumin and piperidine, in combination with an aminoglycoside, for use in the treatment of a microbial infection, and in particular for killing clinically latent microorganisms associated with microbial infections. The present invention also relates to novel combinations comprising one or more compounds selected from the following: carvacrol, thymol, curcumin and piperidine, in combination with an aminoglycoside, for use in the treatment of microbial infections.