A theoretical interaction and a demonstrated clinical interaction are different findings.
A valerian review assessed laboratory experiments, animal work, clinical studies and case reports. It questioned the strength of broad interaction warnings, including warnings involving benzodiazepines, and discussed limitations of translating some laboratory assays into clinical effects.
The available products and study designs varied. Limited clinical evidence of an interaction is not proof that every preparation or sedative combination is safe.
Identify whether the proposed interaction concerns metabolism or additive central effects. Record the actual product and co-exposures. A forensic explanation should state which evidence stream supports the claim and should not turn an uncertain warning into established causation or an evidence gap into a guarantee of safety.
Source: PMC4100259, supplied full-text paper. Findings are paraphrased; case-review implications are an interpretation.
Related: Forensic Toxicology: expert analysis and case review.