Thanks for your query.
I have not been able to locate any medicine by the name of IRET 20. Perhaps, you might have spelt it wrong due to oversight. It will help me immensely if you forward name of salt in IRET.
Nevertheless, the drug can cause complications in pregnancy
or abnormalities in the baby, ONLY WHEN WOMEN are on this drug. Since your wife is NOT taking IRET 20, there won't be ANY complications during pregnancy/to the baby.
You may therefore, continue with the drug IF it is being given for a specific ongoing problem.
Hope I have answered your query.
Dr. Rakesh Karanwal