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Hi,

I am 5.5 weeks pregnant to my first baby and I took erythromycin (antibiotics) on the 22nd day of my pregnancy (22nd day from the first day of my last period) as I did not know I was pregnant.

Dr. told me to take 2 every 8 hours (2 x 250) and I used it for 4 days only (12 in total as I missed it some times).

i am really worried! it was my baby's early stage and i am feeling very sorry thinking that the dosage might be harmful to the baby's first cells. Could you please provide me some info, my thoughts are torturing me! Would this cause any anomalies on my baby?

Also, I have cold sore now and I was always using Zovirax before. Can I still use it? Is it harmful to the baby as I may swallow it when eating something?

I am looking forward to hearing from you.

Many thanks in advance.


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replied January 30th, 2010
First Trimester of Pregnancy Answer A9637
Hi, and thanks for your medical question on eHealth forum!

First of all do not worry. No harm has happened to the baby. In the first 20-30 days since the LMP, the cells that are dividing to form the baby are independent of the environment in the mother’s blood. They are usually not affected by the drugs which the mother took. This is nature’s way of protecting the new life as unless the mother misses her periods, she cannot know that she is pregnant. If the drug was too harmful, usually abortion occurs.

Another good news is that there is no congenital defects reported due to erythromycin use. If you have cold sores, you can take any lactobacillus preparation. However please do so after confirming with your gynecologist. Hope this helps. Take care!



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