The term "pharmacogenetics" refers to the study of individual genetic variations that give rise to different responses to the intake of a drug. Recently, however, it has begun to think that an important role in this sense can also be played by our microbiota. The interaction between our gut microbial flora and drugs is actually bidirectional: evidence has accumulated that some drugs, in addition to classical antibiotics, have a strong impact on the composition of the microbiota.
