The Chemistry of Bliss

C10H14O2
Nepetalactone chemical structure

The Molecule

At the heart of catnip’s characteristic response is nepetalactone—a bicyclic iridoid monoterpene found in the plant’s volatile oils.
Cats perceive these compounds through the main olfactory system, and scent exposure can trigger the familiar rubbing and rolling response.

The Mechanism

Research on plant iridoids found that exposure increased plasma beta-endorphin in responsive cats, while blocking μ-opioid receptors suppressed face-rubbing and rolling. This implicates the μ-opioid system, although the specific olfactory receptor genes and complete neural pathway are still under investigation.

The Effect

Responses are temporary and highly variable rather than guaranteed. Controlled observations found wide differences in response duration and frequency among individual cats and across cat-attracting plants.

In controlled work, oral administration of nepetalactone did not induce the characteristic response, reinforcing that the classic response is driven through the olfactory system.

The Genetics

Not all cats respond. In one study of 100 domestic cats, 68 percent responded to catnip, while some nonresponders reacted to silver vine, Tatarian honeysuckle, or valerian. Age and individual sensitivity also influence the response.

The exact genes and olfactory receptors responsible have not yet been identified; researchers have proposed a genome-wide association study as a path toward answering that question.