Brief Answer:
NOT A PROBLEM NOW
Detailed Answer:
Hello
Thanks for writing to us with your health concern.
Normally, for pregnant ladies, the recommended dosage is 400 microgram per day, that is 0.4 mg. per day.
For women at high risk of having abnormality in babies, daily 4 mg per day is recommended.
Your wife has certainly been taking more than double the recommended dosage.
Was it taken on prescription ?
Folic acid overdose however is unheard of virtually.
For symptoms and side effects of overdose to occur, consumption should occur for a long period of time.. over more than 6 months to a year.
The signs would include psychotic behaviour , irritability,
diarrhoea,
vomiting,
rash, tremors,
depression, allergic reactions on the face, mouth etc.
As she is exhibiting none of these, do not worry.
If there is no previous history ( previous abnormal or malformed baby, prior abortions, family history of abnormal babies ) - then she can continue with 400 microgram per day dose.
From the 4th month onwards, standard iron tablets are available which combine this dose with the iron content, so she can take these now.
So do not worry about the mistake now.
All the best.
Please feel free to discuss further.