I would be hesitant to routinely recommend an antibiotic ointment for cracked
nipples.  Antibiotics kill the "good bugs" and well as the bad ones.  It
seems like we might be inviting antibiotic resistant organisms and thrush.
 We are now seeing drug resistant organisms that are resistant to methicillin
(Vancomycin, I think), which was formerly effective against these organisms.
I have a feeling the epidemic proportions of thrush relate to an overuse of
antibiotics.  With our routine short postpartum stays in the western US
(usually 24 hours or less after vaginal birth and two days after a Cesarean),
I see increased use of antibiotics.  Some doctors use them prophylactically
on all Cesarean patients.  Most prescribe antibiotics for any temperature
over 100.4 F (38 C. I think).   In the past, a minor temperature elevation in
the first day or two after surgery was considered normal.
In the US only a doctor or pharmacist can prescribe or recommend medications
of any kind.  Is it different elsewhere?  Bonnie