while some antibiotics do induce hepatic enzymes to decrease the efficacy of contraceptive pills amoxicillin is not one of them and can be safely used without the fear of contraceptive failure. however it is important to stick to the contraceptive schedule. if you have taken crisanta (ethinyl estradiol) regularly without missing any pills then you can rely on it completely. if you have missed a couple of pills or more then it will be prudent to use a backup method like condom. crisanta has to be used regularly as advised. there is no modification in the course or dosage necessary. no backup contraceptive required if you have not missed any pills in this cycle and have been taking crisanta for more than one cycle. for further information consult an obstetrician and gynaecologist online --> <link>
will antibiotics reduce the effect of oral contraceptive pills?