Does Nitrofurantoin Contain Any Sulfur?


My doctor (OBG) gave me nitrofurantoin monohydrate macrocrystals (100 caps) for a UTI. 3 days after completing my dose I got an allergic reaction with hives, etc. I went to my MP Dr. and she said I may be allergic to sulfur, but my OBG just told me there is no sulfur in this antibiotic. I am a little confused. So what am I allergic to?

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Hello Shadow,

Sorry to hear that you are having an allergic reaction to something in your medication. One thing I would like to point out is that people often confuse sulfa, sulfate, sulfur and sulfite. Sulfur is most commonly found in fertilizers and is unlikely in any medication that you are taking, however sulfa and sulfates are found in medication frequently. It is important when talking with medical professionals to know which of these they are talking about.

I would love to give you a detailed list of what is in your medication so that you and your doctor can further identify what you may be possibly allergic to. In order to do this I'm going to need some details on the particular medication you are taking. Can you please tell me the brand/generic of Nitrofurantoin you are taking as well as the dosage?

Here is an example of a brand of Nitrofurantoin that contains a sulfate.


Amneal Pharmaceuticals LLC

Active Ingredients:

- Nitrofurantion Monohydrate 75mg
- Nitrofurantoin 25mg

Inactive Ingredients:

- Carbomer Homopolymer Type B
- Carboxymethylcellulose
- Starch, Corn
- D&c Yellow No. 10
- Fd&c Red No. 40
- Gelatin
- Ferrosoferric Oxide
- Ferric Oxide Yellow
- Lactose
- Magnesium Stearate
- Maltodextrin
- Povidone
- Sodium Lauryl Sulfate
- Sucrose
- Talc
- Titanium Dioxide
- Butyl Alcohol
- Alcohol
- Isopropyl Alcohol
- Potassium Hydroxide
- Propylene Glycol
- Water
- Shellac
- Ammonia
- Sodium Hydroxide

Without knowing your brand I couldn't tell you what is inside of the medication. This was just an example of one brand that uses a sulfate as an inactive ingredient. When you provide me with the information I requested above I can provide you with more details on your specific medication.

I hope this helps.

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Re: Kevin (# 1) Expand Referenced Message

Nitrofurantoin Monohyd Mac100 caps Generic for: Macrobid 100mg caps

This is all it says.

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