public function listing()
 {
     $access_level = $this->session->userdata('user_indicator');
     $source = 0;
     if ($access_level == "pharmacist") {
         $source = $this->session->userdata('facility');
     }
     $data = array();
     $data['styles'] = array("jquery-ui.css");
     $data['scripts'] = array("jquery-ui.js");
     $data['regimens'] = Regimen::getAll($source);
     $data['regimens_enabled'] = Regimen::getAllEnabled($source);
     $data['regimen_categories'] = Regimen_Category::getAll();
     $data['regimen_service_types'] = Regimen_Service_Type::getAll();
     $data['drug_codes'] = Drugcode::getAll($source);
     $data['drug_codes_enabled'] = Drugcode::getAllEnabled($source);
     $this->base_params($data);
 }