Just about 70% of ladies studied about an effective epilepsy tranquilize have not gotten new wellbeing notices about the perils of taking it amid pregnancy, the BBC has been told solely.
Sodium valproate, known as Epilim, conveys a 10% danger of physical irregularities in unborn children.
Around 20,000 kids have been hurt by valproate drugs in the UK since the 1970s.
The medications controller said the medication had been kept under consistent audit.
Children presented to the medication in the womb have a 40% danger of creating a mental imbalance, low IQ and learning incapacities.
The overview of 2,000 ladies and young ladies with epilepsy under 50 was charged by three philanthropies - Epilepsy Society, Epilepsy Action and Young Epilepsy.
Data hole
Of the 475 as of now taking the medication, 68% said they had not gotten the new notices known as the Valproate Toolkit.
The toolbox was propelled in February 2016 and included printed notices for patients in GPs' surgeries, doctor's facilities and drug stores, containing avant-garde data on the dangers for neuro-formative issue in offspring of ladies taking the medication.
The toolbox was made after the European Medicines Agency advised every national guard dog to enhance data for patients.
The study additionally demonstrated that one out of six ladies taking sodium valproate did not know the medication could "adversely influence the advancement as well as physical soundness of kids destined to ladies taking this prescription".
Twenty-one for each penny said they had not had a talk started by a medicinal services proficient about the dangers of taking the medication amid pregnancy.
Sodium Valproate has been recommended since the 1970s yet it was just a year ago that notices were put on bundles, as a component of the new cautioning framework.
Many moms of a portion of the 20,000 kids hurt by the medication in the UK since that time demand they were never told about the mischief it could do.
Natasha Mason's child Alfie, who is three years of age, has just barely figured out how to walk. He has been seriously hurt by the medication.
Natasha stated: "I didn't know it could make any issues the unborn youngster.
"It wasn't until the point that I went to see a pediatrician with my child when he was 10 months old, that it started to click…
"He specified fetal valproate disorder and that was the point at which I began to freeze."
Routine checks
The Epilepsy Society is currently approaching the Health Secretary Jeremy Hunt to roll out quick improvements to anticipate GPs issuing rehash solutions to ladies for over a year without eye to eye discussions with them.
It additionally needs routine checks at family arranging centers to incorporate exchanges about the dangers of sodium valproate in pregnancy.
Its CEO Clare Pelham, said the study demonstrated that the quantity of ladies who had never had a discussion with their specialist about the dangers of the medication was "willfully high, drifting around 20%".
She included: "A large number of children have been conceived with incapacities whose moms were absolutely unconscious of the dangers - and will keep on being, if nothing is finished.
"Government officials don't regularly find the opportunity to accomplish something as imperative as this for moms and babies; and even less frequently is it so basic thus reasonable."
The consequences of the overview will be introduced one week from now to the European Medicines Agency, which will analyze whether current notices are sufficient.
'Increase endeavors'
The Medicines and Healthcare Products Regulatory Agency (MHRA) in the UK says valproate had been, "kept under steady survey and as new information have turned out to be accessible, the notices have been refreshed".
The MHRA stated: "The consequences of the review are vital in helping us comprehend the viability of the measures taken to date in the UK. We need to urge all ladies to approach the valproate toolbox materials that we made accessible in February 2016.
"We always screen the protected utilization of valproate and bolster this most recent audit by the European Medicines Agency on the utilization in pregnancy and ladies of childbearing age."
Its recommendation is that patients ought not quit taking the pharmaceutical without counseling their specialist.
Prof Helen Stokes-Lampard, seat of the Royal College of GPs, stated: "Any occurrences in which valproate has been recommended with pregnant ladies are a reason for concern.
"We approach all organizations to intensify endeavors to guarantee that the most up and coming notices are generally conveyed to all human services experts and patients - and the RCGP will keep on playing our part in guaranteeing we accomplish this.
"Patients ought to never falter to raise any worries they have about valproate, or some other medicine, with their GP or other wellbeing proficient."
The Association of British Neurologists said it was working intimately with the MHRA to guarantee that any young lady who is taking sodium valproate is completely mindful of - and helped to remember - the dangers of getting to be plainly pregnant while taking this treatment.