Hexokinase 2 (HK2) is a critical rate-limiting enzyme in glycolysis, significantly linked to cancer metabolism and drug resistance. We hypothesized that targeting HK2 with Benserazide (BenZ), a known HK2 inhibitor, could potentiate the cytotoxicity of cisplatin (DDP) in non-small-cell lung cancer (NSCLC) cells. Our findings demonstrated that combination of DDP and BenZ significantly enhanced anticancer effects in NSCLC cells, either with or without acquired DDP resistance. In particular, BenZ effectively inhibited ATP and lactate productions. ATP supplementation mitigated the cytotoxicity of the combination treatment, which was restored when both the cisplatin efflux transporters, ATP7A and ATP7B, were simultaneously knocked down. Moreover, BenZ suppressed NF-κB activation and downregulated inflammatory gene expressions, including IκB and RELA phosphorylation, TNF-α, BCL-2, and IL-1β. These effects were attributed to inhibition of HK2 by BenZ leading to the suppression of IκBα phosphorylation. It has been shown that combined use of DDP and BenZ significantly inhibited tumor growth in NSCLC cell xenograft mouse models, while BenZ alleviated the DDP-induced nephrotoxicity. Our findings demonstrate that BenZ inhibits the kinase activity of HK2, reduces ATP level and cisplatin efflux, as well as alleviates NF-κB activation. These multifaceted actions enhance the anticancer efficacy of cisplatin in NSCLC cell models, indicating its potential as an effective adjunct therapy.