Agree, it's completely wrong, nobody should take any medicine which is prescribed for someone else - what works for you could br risk for someone else. It's not a case of "sharing" - you need those meds, she doesn't - or if she needs her own, she too needs to go and see the doctor. Your mom is wrong on this occasion - you stand up for yourself otherwise you will have no medicine left, and as sir.alec says, it will behard for you to explain why you have given it away. Prescriptions cost money to the State, they are not for sharing out.