Tell your medical professional or pharmacist if any of the following Negative effects get really serious or lasts lengthier than a few days: Oral contraceptives, norethisterone and/or ethinyl oestradiol Co-administration of pregabalin with the oral contraceptives norethisterone and/or ethinyl oestradiol isn't going to impact the regular-condition pharmacokinetics of possibly compound. http://thesleepingpills.com