There are more than a dozen women who were prescribed drugs before the trial was halted who are waiting to see if the drug had an adverse effect on their pregnancy.
An interim analysis found the chance of blood vessel disease in the lungs "appears to be greater and the chance of death after birth seems to have increased".
The drug was originally developed by Pfizer but is now off patent and available as a generic.
A team led by Kenneth Lim at the University of British Columbia is part of an global research effort looking at the effectiveness of sildenafil, the generic name of Viagra, in treating women with a condition called early-onset intrauterine growth restriction.
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In the placebo group, nine babies died but none from the lung condition. It said researchers expected all such usage of the drug to be stopped and that further research should examine the effects and safety of the substance when used in pregnancy. "We will contact the 20 other Canadian women who have already participated in the trial", Lim wrote in an email.
In total, 93 Dutch women were given sildenafil - better known by its brand name Viagra - as part of the trial.
The Dutch component involved some 183 pregnant women who suffered from fetal growth restriction, where an underdeveloped placenta can't get enough oxygen or nutrients to a gestating baby. It was sildenafil, the active ingredient in many erectile dysfunction drugs.
Mr Kumar said a decision on the future of the Queensland study would be decided within a fortnight and, in the meantime, they have stopped recruiting mothers for their research.
Since at present, there is no treatment to correct the problem, the women were selected for the drug trial, which showed favourable results in animal studies.
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In the Queensland study, the drug was used over a significantly shorter time frame and for different reasons. Eleven of these deaths were due to a possible lung disease, a form of high blood pressure in the lungs.
It can mean babies are born prematurely, with a very low birth weight and poor chances of survival.
A spokesman for Amsterdam UMC said it believed the trial had been conducted properly, but would expect an external investigation to be launched. That poses a hard dilemma for doctors: Inducing birth too early increases the risk of complications, but waiting too long could lead to developmental anomalies or stillbirth. Stuff.co.nz reported in March on the results of a study that involved 122 Australian and New Zealand women, half of whom received sildenafil.
Why would they give pregnant women Viagra?
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