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Myocardial infarction (MI) is the most common heart disease, and also, it is one of the leading causes of death from cardiovascular disease. It is well known that MI causes additional injury during blood flow restoration in ischaemic myocardium. Boeravinone B (BB) is a well-known antioxidant and anti-inflammatory drug. We investigated the cardioprotective effect of BB drug against isoproterenol (ISO)-induced MI in rats in this experimental study, along with we analysed its underlying mechanism. Adult Sprague Dawley (SD) rats were treated subcutaneously with ISO (45 mg/kg), then divided into groups and then given BB drug was administered orally. The cardioprotective effect of BB on ISO-induced MI rats was analysed by estimating the heart injury markers, antioxidant pro-inflammatory cytokines and inflammatory parameters. We also detected quantified expression of inflammation and apoptosis-related marker protein family. We estimated the effect of BB drug on GUT microbiota in ISO-induced MI rats and scrutinized the histopathological variations in heart tissues. BB treatment significantly (P < .001) diminished the level of heart markers such as lactate dehydrogenase (LDH), troponin (TnT), creatine kinase (CK) and creatine kinase isoenzymes MB (CK-MB). BB treatment also altered the antioxidant parameters and reduced the pro-inflammatory cytokines in the serum and tissues. Additionally, the histopathological aspects demonstrated that the pathological changes observed in the heart tissue of the ISO group rats were suppressed by the BB treatment to varying degrees. Furthermore, the expressions of caspase-3, p53, caspase-9, Bax, interleukin-6 (IL-6), cytochrome C, neutrophil gelatinase-associated lipocalin (NGAL), tumour necrosis factor-a (TNF-a), nuclear factor kappa B (NF-κB) and interleukin-1ß (IL-1ß) in the heart tissue were down-regulated whereas the Bcl-2 expression seemed to be enhanced. BB treatment not only alleviated ISO-induced gut dysbiosis by its enhanced specified Firmicutesto-Bacteroidetes (F/B) ratio but also maintained the relative abundance of major bacteria such as Clostridium IV, Butyricicoccus, Clostridium XIVs, Akkermansia and Roseburia. Collectively, our findings showed that the BB drug acted against myocardial infraction and prevented the damage by reducing the oxidative stress and controlling the inflammatory pathways, and gut microbiota. [ABSTRACT FROM AUTHOR]