Community pharmacy is increasingly positioned as a public-health setting, yet expertise, service reach, and professional trust do not themselves establish influence over the commercial and policy conditions shaping population health. This conceptual article develops a Collective Political-Agency Framework explaining how distributed pharmacy expertise can become legitimate public-health influence. It distinguishes professional capability from political access, voice, representation, agenda-setting capacity, and consequential influence. Political agency is treated as a collective accomplishment requiring organizational translation of expertise, representative legitimacy, coalition capacity, access to decision venues, and accountability to affected communities. The analysis situates pharmacy within the commercial determinants of health, where organized interests and public institutions already compete to shape agendas. The central claim is conditional: pharmacists and pharmacy organizations are more likely to exercise legitimate public-health influence when credible expertise is connected to accountable representation, coordinated organizational voice, coalition-building, and agenda access.