My mother is taking Eltroxin 100 for Thyroid from almost a decade. No issues from it. It's been 2 months she has been continuously taking it post it's expiry date unknowingly that the medicine has crossed it's expired date. Date of expiry was Sept 2018. Now it's Dec 2018. Just want to know, are there any adverse effects from taking this medicine post its expiry date. Although no noticeable effect seen till now, just because I am worried as she is experiencing a bit cough (may be due to the reduced effect of medicine). Kindly advise.