title: Tiered formularies open the potential for lack of access to needed drugs.
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000191:economics / Q000627:therapeutic use*; D017047:Cost Sharing; D016861:Cyclooxygenase Inhibitors / Q000191:economics / Q000627:therapeutic use*; D005569:Formularies as Topic; D006297:Health Services Accessibility; D006801:Humans; D014481:United States
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D016861:Cyclooxygenase Inhibitors