A dispensing device for dispensing pain management medicaments to a patient comprising first and second threadably interconnectable sub-assemblies. The first of these sub-assemblies houses a novel collapsible fluid reservoir defining component while the second comprises a fluid delivery and control assembly that includes a novel flow control means that functions to control the flow of medicinal fluid from the fluid reservoir of the collapsible reservoir defining component toward the patient via a plurality of fluid flow control passageways.
