Does Nitrofurantoin expire? 

Does Nitrofurantoin expire?

Yes, Nitrofurantoin does expire. However, it can outlive its expiry date if it is stored properly, but if the antibiotic has expired for over a year, it is not recommended to take it. 

An active bacterial infection does not respond to anything but a 100% potent antibiotic. This is why it’s best to stick to an antibiotic that is still in effect.

What are the dangers associated with the use of expired Nitrofurantoin? 

The most important concern when it comes to using expired Nitrofurantoin is antibiotic resistance. This occurs when you keep exposing your body to a less potent antibiotic. The bacteria soon improvise and build resistance against Nitrofurantoin. 

Another possible side effect is an allergic reaction. Several surveys have revealed that expired Nitrofurantoin can cause symptoms of an allergic reaction, including redness of the skin, itching, burning sensation, blisters, etc. 

This indicates that there’s something in the expired Nitrofurantoin that can cause allergy in some people and there’s no way to tell who is most likely to suffer from this allergic reaction. This is why it’s best to avoid using expired Nitrofurantoin or any other medication for that matter (1).

What to do if you have taken expired Nitrofurantoin?

If you have taken an expired Nitrofurantoin and you feel fine, you don’t have to do anything. Just make sure you don’t take any more of the expired antibiotic. 

However, if you feel unusual or your body starts to itch, reach out to your healthcare provider as soon as you can. The expired contents of the drug can trigger an allergic reaction in your body and you may need medical attention to get rid of it. 

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U.S. Food and Drug Administration. Don’t Be Tempted to Use Expired Medicines [Internet]. Silver Spring (MD): U.S. Food and Drug Administration; 2021 [cited 2022 Oct 18]. Available from: