Medication schedules are usually expressed as stable instructions, yet medication taking occurs inside everyday lives whose timing, demands, relationships, and available support continually change. Accounts centred on adherence identify whether medicines are taken as prescribed but often reveal less about how medication-taking practices remain workable, become disrupted, or are reconstructed when ordinary routines change. This conceptual article develops Temporal Negotiation Theory to explain medication taking as temporally organized work distributed across patients, family caregivers, and pharmacy teams. Drawing on evidence concerning treatment burden, habit formation, medication work, care transitions, caregiver involvement, professional role negotiation, and pharmacy-based coordination, the theory distinguishes temporal anchors that stabilize medication practices from disruption episodes that expose mismatches between prescribed schedules and lived routines. Disruption does not necessarily produce medication failure. It can initiate negotiation over timing, assistance, monitoring, practical control, and responsibility. Responsibility may remain with the patient, become temporarily shared, migrate toward family caregivers, or be supported by pharmacy teams, while reconstructed routines may subsequently stabilize, remain fragile, or become disrupted again. The theoretical contribution is therefore a process account in which medication schedules acquire practical viability through recurring alignment among temporal anchors, available capacity, and responsibility arrangements. This perspective shifts attention from isolated dose-taking behavior toward the temporal organization of medication work and the conditions under which that organization can be renegotiated. For regimen design and counselling, the theory implies that workable schedules depend not only on pharmacological instructions but also on how medication tasks can be incorporated, supported, and redistributed within everyday life.
