I got lice from my niece when i was 37 weeks pregnant and rang the chemist and they reccomend the conditioner only....i was advised not to use any type of lice treatment.
My sister did it for me with conditioner and she also has a little electric comb thingy called a Robi-Comb it uses a electric current to zap them or something so you dont have to worry about all the other stuff. We did a run through with the conditioner and the robi-comb and that was it no more treatments after that!!