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Doctor insights on: Macrobid Dosage

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How long does Macrobid stay in your system after taking the last dosage?

How long does Macrobid stay in your system after taking the last dosage?

24hours: Half life is 12 hours. That means the half of the total dose taken will be gone after 12 hours and then another 12 hours 50% from the other half will be gone and so forth. ...Read more

Dr. Marvin Ott
292 doctors shared insights

Nitrofurantoin (Definition)

Nitrofurantoin is an antibiotic which is marketed under the following brand names; niftran, furadantin, (nitrofurantoin) furabid, macrobid, macrodantin, nitrofur mac, nitro macro, nifty-sr, martifur-mr, uro-tablinen or nifuretten (in germany), martifur-100 (in india), urantoin, nifuran (in macedonia) and uvamin (in middle east). It is usually used in treating urinary tract infection. It is often ...Read more


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If you throw up shortly after taking medicine, do you take it again or wait for the next dose... Just took Macrobid & proplythiouracil. Morning sickne?

If you throw up shortly after taking medicine, do you take it again or wait for the next dose... Just took Macrobid & proplythiouracil. Morning sickne?

Depends: If you visibly can identify the pills you initially took in your emesis(vomit) then it wouldn't be unreasonable to take another dose, but if you can't identify the pill(s), be careful, with taking extra. If you are really concerned just touch base with your prescribing physician. ...Read more

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I am on dose 2 of macrobid for UTI &making my oral thrush worse. I am waiting to see ID for thrush treatment but appt is 1 mth - do I stop macrobid?

I am on dose 2 of macrobid for UTI &making my oral thrush worse. I am waiting to see ID for thrush treatment but appt is 1 mth - do I stop macrobid?

Maybe: If your urinary tract symptoms are still present, then you need to continue the macrobid. However, macrobid rarely causes thrush. If you truly have thrush, there may be another cause. You should see your PCP or try to move your appointment up or see a different ID doctor. ...Read more

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Can 100mg Macrobid tablet be opened and taken?

Can 100mg Macrobid tablet be opened and taken?

Macrobid: Macrobid is the drug Nitrofurantoin in a special matrix so that the active drug is released over an extended period. This allows twice a day dosing for a drug that is normally given 4 times a day. Opening the tablet will destroy the time-release system. This will cause an overdose of the drug to enter the circulation and then there will be a period when no drug is released.Don't open the tablet. ...Read more

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How long does it take for Macrobid to get out of your body?

Half life not long: Up to 1 hour. It's not the medication making you feel ill, but the prescribing MD should be notified as soon as you can. ...Read more

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Feeling very sick while taking Macrobid at night why does this feeling only occur at nightime?

Timing of med?: Good question- no good answer except if you are timing your dosage where you get sick shortly before you go to bed, with potential drug- drug interaction if you are on other medications. You should go back to your doctor, to discuss this question. ...Read more

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What would you consider a long term usage of macrobid? I have taken it daily for 1 1/2 years.

What would you consider a long term usage of macrobid?  I have taken it daily for 1 1/2 years.

Furadantin (nitrofurantoin): This should not be taken chronically in this manner. It has numerous potentially very severe side-effects including interstitial pneumonia and others. It is a close cousin of the drug Dilantin which has full texts written about the toxicities. Would stop this now and discuss with the doctor who ordered it. ...Read more