Aim of the Study: The primary aim of the study was to test the effect of 2,4,5-trimethoxy-1-propenylbenzene (alpha asarone), a hypocholesterolaemic drug, on the progression of collageninduced arthritis (CIA) in mice. Olive oil, the vehicle of alpha-asarone, and dexamethasone were used as control treatments. Set-Up: Four groups of DBA/1 mice were immunised with chicken type II collagen (CII) via the intradermal route and either left untreated or were treated with alpha asarone, olive oil, or dexamethasone. A non-immunised group was an additional control. Follow-Up: The thicknesses of the rear and front footpads were continuously monitored, and the levels of anti-collagen antibodies were measured at the end of the experiment. The animals were then sacrificed, and their rear and front limbs were removed and processed for histological examination. Results: Alpha asarone had no anti-inflammatory effect on CIA, and in one-third of the animals, it showed a pro-inflammatory effect that was characterised by a marked accumulation of neutrophils. Olive oil did not show any obvious anti-inflammatory effect on CIA, but it lowered the level of CII anti-bodies by 50%, suggesting a potential long-term anti-inflammatory effect. As expected, dexamethasone had a clear anti-inflammatory effect on CIA. Conclusion: Alpha asarone did not show any antiinflammatory effect on CIA in the mice under the above conditions; however, the accumulation of neutrophils in the CIA lesions of mice treated with alpha asarone and the effect of olive oil in downregulating the levels of anti-CII antibodies in CIA are two findings that warrant further investigation.