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With the rising threat of antibiotic resistance, phage therapy has emerged as a promising alternative alongside. However, no studies have explored the potential interactions between phages and these mucoactive agents despite their frequent concurrent use during phage therapy. Therefore, investigating the potential synergy and its subsequent impact on phage infection dynamics could enhance clinical strategies for treating bacterial infections with phages. Our study utilized\n              <jats:italic>Pseudomonas aeruginosa<\/jats:italic>\n              strain ZS-PA-35 and\n              <jats:italic>Klebsiella pneumoniae<\/jats:italic>\n              strain Kp36, alongside their respective phages, to investigate their interactions in the presence of NAC or AMB. Our findings indicate that, under specific conditions, these mucoactive agents can function as adjuvants to lytic phages, enhancing bacterial susceptibility to phage infection and facilitating subsequent phage proliferation. Our study revealed that these synergistic interactions are strongly influenced by the physiological characteristics of the phages, the surrounding microenvironments, and the physiology of host tissues, as varying outcomes of phage-host interactions were observed among different phages and across distinct media. Taken together, our results emphasize the complexity of interactions between phages and NAC or AMB, underscoring the need for caution when using combination treatments.\n            <\/jats:p>\n            <jats:sec>\n              <jats:title>IMPORTANCE<\/jats:title>\n              <jats:p>\n                <jats:italic>N<\/jats:italic>\n                -acetylcysteine (NAC) and ambroxol hydrochloride (AMB) are used in medical treatment of patients with acute and chronic bronchitis. Often, the choice of NAC or AMB is empirically determined by physicians. However, the potential impact of combining NAC or AMB with phage therapy remains unclear. To address this gap, a comprehensive understanding of their interplay is crucial to determine any potential synergistic effects. This study aims to elucidate how NAC or AMB influence phages targeting different receptors, thereby affecting their antibacterial activity against\n                <jats:italic>Pseudomonas aeruginosa<\/jats:italic>\n                and\n                <jats:italic>Klebsiella pneumoniae<\/jats:italic>\n                . Our results suggest that, under certain conditions, NAC or AMB provides an adjuvant effect by rendering the cells more susceptible to phage infection. These results contribute to advancing our understanding of the clinical combination of mucoactive agents and phage therapy, offering insights for optimizing treatment efficacy.\n              <\/jats:p>\n            <\/jats:sec>\n          <\/jats:sec>","DOI":"10.1128\/spectrum.01601-24","type":"journal-article","created":{"date-parts":[[2025,2,6]],"date-time":"2025-02-06T14:00:25Z","timestamp":1738850425000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":10,"title":["Synergistic action of mucoactive drugs and phages against\n            <i>Pseudomonas aeruginosa<\/i>\n            and\n            <i>Klebsiella pneumoniae<\/i>"],"prefix":"10.1128","volume":"13","author":[{"given":"Bingrui","family":"Sui","sequence":"first","affiliation":[{"name":"MOE Key Laboratory of Bio-Intelligent Manufacturing, School of Bioengineering, Dalian University of Technology","place":["Dalian, 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