Administering the biological response modifier erythropoietin

Which intervention should the nurse implement when administering the biological response modifier erythropoietin (Epogen) subcutaneously? Select all that apply. 1. Do not shake the vial prior to preparing the injection. 2. Apply a warm washcloth after administering the medication. 3. Discard any unused portion of the vial after pulling up the correct dose. 4. Keep the medication vials in the refrigerator until prepared to administer. 5. Administer the medication intramuscularly in the deltoid muscle.