<s>[INST] hi im taking champix to stop smoking and i was wondering if that could give a negitive pregnancy test [/INST] Dear kim, Hi from healthcaremagic forum, Champix as per study does not have any such effect on UPT and so there are no chances of negetive UPT.If you are suspecting and you have lapsed your periods then you may consult your nearest gynaecologist for further help.Moreover it is not indicated during pregnancy. You can refer the following site for side effects of champix </s>