A new study has found Primodos - a drug used in hormone pregnancy tests - did have the potential to cause birth defects.
The research by the Institute of Medical Sciences at Aberdeen University conflicts with a recent government-commissioned report.
The drug was used in the 1960s and 70s to test for pregnancy but was suddenly withdrawn in 1978.
It's been claimed since that the test led to birth defects including children being born with undeveloped limbs and severe brain damage.
A government commissioner study published three months ago found there was not enough scientific evidence to prove a link between Primodos and birth defects.
However now new research released today by Dr Neil Vargesson claims to show scientific proof that there is a link.
Bolton South East MP Yasmin Quereshi has long campaigned on the issue and said
"We are hoping this will make the government rethink and actually consider what we have been saying for years.
"We actually now have credible scientific evidence.
"There are so many links here, and I hope the government will take this seriously and order a proper enquiry not led by MHRA not by the department of health but by independent people"