Exhibit 21.1



MEDCO HEALTH SOLUTIONS, INC.

List of Subsidiaries



|                                                               |  |                                        
|-------------------------------------------------------------- |  | ---------------------------------------
|Subsidiary Name                                                |  | Jurisdiction of Incorporation/Formation
|Bravell, Inc.                                                  |  | Wisconsin                              
|Medco Containment Insurance Company of New Jersey              |  | New Jersey                             
|Medco Containment Life Insurance Company of New York           |  | New York                               
|Medco Containment Life Insurance Company                       |  | Pennsylvania                           
|Medco Health, L.L.C.                                           |  | Delaware                               
|Medco Health New York Independent Practice Association, L.L.C. |  | New York                               
|Medco Health Puerto Rico, L.L.C.                               |  | Delaware                               
|Medco Health Receivables, L.L.C.                               |  | Delaware                               
|Medco Health Solutions of Columbus North, Ltd.                 |  | Ohio                                   
|Medco Health Solutions of Columbus West, Ltd.                  |  | Ohio                                   
|Medco Health Solutions of Fairfield, L.L.C.                    |  | Pennsylvania                           
|Medco Health Solutions of Henderson, Nevada, L.L.C.            |  | Delaware                               
|Medco Health Solutions of Hidden River, L.C.                   |  | Florida                                
|Medco Health Solutions of Las Vegas, Inc.                      |  | Nevada                                 
|Medco Health Solutions of Netpark, L.L.C.                      |  | Delaware                               
|Medco Health Solutions of North Versailles, L.L.C.             |  | Pennsylvania                           
|Medco Health Solutions of Parsippany, L.L.C.                   |  | New Jersey                             
|Medco Health Solutions of Richmond, L.L.C.                     |  | Virginia                               
|Medco Health Solutions of Sabal Park, L.C.                     |  | Florida                                
|Medco Health Solutions of Spokane, Inc.                        |  | Washington                             
|Medco Health Solutions of Texas, L.L.C.                        |  | Texas                                  
|Medco Health Solutions of Willingboro, L.L.C.                  |  | New Jersey                             
|medcohealth.com, L.L.C                                         |  | New Jersey                             
|Merck-Medco of Willingboro Urban Renewal, L.L.C.               |  | New Jersey                             
|NJRE, L.L.C.                                                   |  | New Jersey                             
|PharMark Corporation                                           |  | Delaware                               
|ProVantage Health Services, Inc.                               |  | Delaware                               
|ProVantage Mail Services, Inc.                                 |  | Minnesota                              
|PROV MED, L.L.C.                                               |  | Wisconsin                              
|PVHS, Inc.                                                     |  | Delaware                               
|Systemed, L.L.C.                                               |  | Delaware                               
|The Institute for Effectiveness Research, L.L.C.               |  | Delaware                               
|NRX Federal Corp                                               |  | Delaware