A 39 year old G1P1 began profusely bleeding 30 minutes after…

A 39 year old G1P1 began profusely bleeding 30 minutes after an unremarkable spontaneous vaginal delivery.  Pitocin 10 IU IM was given in active third stage management.  The patient’s medical history includes an allergy to penicillin and asthma.  What is the BEST second line medication to use with this patient?