In addition,
although Nevirapine has been quite effective for reducing perinatal
transmission, it's not really recommended for long term prophylaxis
status post an exposure because of severe liver-related side effects
seen among hospital workers who took it after occupational
exposures. In the context of reducing mother to child transmission, a
single 200 mg dose is given orally to the mother at onset of labor and
a single 2 mg/kg oral dose is given to the infant at 48-72 hours. If
the mother received NVP less than one hour prior to delivery, the
infant should be given 2 mg/kg oral NVP as soon as possible after
birth and again at 48-72 hours. It's been well tolerated in these
situations. Although CDC has no data related to rape cases, one might
extropolate from the perinatal situation to this situation and
hypothesize that a single dose of NVP to the infant within a few hours
of a high risk exposure might be beneficial in reducing transmission.
The CDC is in the process
of updating the nonoccupational PEP guidelines and they should be
going out for public comment soon, but it will be a while before they
get published.