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Dr. Andrew Rynne
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Dr. Andrew Rynne

Family Physician

Exp 50 years

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Does Macrobid Intake Cause Cold Sore Flares?

Can taking macrobid cause cold sore flares or is this Ana allergic reaction? I am given macrobid about once a year for UTIs and EVERY time I take it I get terrible cold sores! I never have cold sores pop up just randomly (though I understand how the virus stays latent in the body, mine only seem to manifest when on Macrobid). Thank you!
Thu, 13 Dec 2018
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General & Family Physician,  's  Response
Hi,

Macrobid does give allergic reactions with rash, itching /swelling difficulty in breathing.

The cold sores are due to virus & have a characteristic appearance. It can be diagnosed by culture from the lesion/blood test for antibodies.

You need to go & get examined by your treating doctor. Who would see the sore, get investigated if needful to diagnose & treat specifically (change of medication to avoid if it's allergy /give antiviral drug as per need)?

Hope I have answered your query. Let me know if I can assist you further.

Take care

Regards,
Dr Vasudha Jayant Athavale, General & Family Physician
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Does Macrobid Intake Cause Cold Sore Flares?

Hi, Macrobid does give allergic reactions with rash, itching /swelling difficulty in breathing. The cold sores are due to virus & have a characteristic appearance. It can be diagnosed by culture from the lesion/blood test for antibodies. You need to go & get examined by your treating doctor. Who would see the sore, get investigated if needful to diagnose & treat specifically (change of medication to avoid if it s allergy /give antiviral drug as per need)? Hope I have answered your query. Let me know if I can assist you further. Take care Regards, Dr Vasudha Jayant Athavale, General & Family Physician