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Is nitrofurantoin safe in first trimester?

Author

Ava White

Updated on February 22, 2026

Is nitrofurantoin safe in first trimester?

Background: In 2011, the American College of Obstetricians and Gynecologists (ACOG) released a committee opinion warning against the use of nitrofurantoin (Macrobid) during the first trimester of pregnancy due to the perceived risk of an increased rate of congenital abnormalities with its use (Committee Opinion 2017).

Then, is nitrofurantoin safe in early pregnancy?

It's usually safe to take nitrofurantoin during pregnancy and while breastfeeding. It's very unlikely that nitrofurantoin is harmful during pregnancy. It goes straight into your pee, so very little of the medicine passes through to the unborn baby.

Likewise, can nitrofurantoin harm my baby? Nitrofurantoin is commonly prescribed in pregnancy with no known adverse effects on the developing baby. However, it is always a good idea to let your doctor know that you are pregnant if you have taken any medicines in case you need any additional monitoring or treatment.

Consequently, what antibiotics are safe for UTI in first trimester?

Alternative antibiotics that might be used in the first trimester for treatment of UTIs include ampicillin, amoxicillin, cephalexin, and amoxicillin-clavulanic acid. Substantial evidence supports the safety of these antibiotics in early pregnancy.

When should you not take nitrofurantoin when pregnant?

In some advisements, the use of nitrofurantoin is contraindicated near term (38 to 42 weeks' gestation) and during labor and delivery because of the potential for the induction of hemolytic anemia in the neonate, which is caused by low levels of red blood cell glutathione.

Can a UTI harm a fetus?

With proper care, you and your baby should be fine. Usually, these infections in the bladder and urethra. But sometimes they can lead to kidney infections. If they do, UTIs may lead to preterm labor (giving birth too early) and low birth weight.

Can UTI cause miscarriage?

Urinary Tract Infections: A UTI alone doesn't cause a miscarriage, but complications might. "If [a UTI] is not treated and the infection ascends into the kidneys, it can cause a very serious full-body infection called sepsis which can cause a miscarriage," says Chiang.

Is Macrobid safe in early pregnancy?

The antibiotics -- trimethoprim-sulfamethoxazole (Bactrim) and nitrofurantoin (Macrobid) -- have been linked to a small risk for birth defects in pregnant women when given in the first trimester.

Can early pregnancy cause UTI?

Pregnant women are at increased risk for UTIs starting in week 6 through week 24 because of changes in the urinary tract. The uterus sits directly on top of the bladder. As the uterus grows, its increased weight can block the drainage of urine from the bladder, causing a urinary tract infection during pregnancy.

Can nitrofurantoin cause yeast infection?

Use of nitrofurantoin for prolonged or repeated periods may result in oral thrush or a new vaginal yeast infection. Contact your doctor if you notice white patches in your mouth, a change in vaginal discharge, or other new symptoms. A very serious allergic reaction to this drug is rare.

Who should not take nitrofurantoin?

You should not take nitrofurantoin if you have severe kidney disease, urination problems, or a history of jaundice or liver problems caused by nitrofurantoin. Do not take this medicine if you are in the last 2 to 4 weeks of pregnancy.

Is amoxicillin safe in 1st trimester pregnancy?

Amoxicillin is considered a pregnancy category B drug by the U.S. Food and Drug Administration (FDA). That means it's considered safe to take while pregnant. The FDA assigned this category to help doctors understand whether or not amoxicillin can cause birth defects when taken by pregnant women.

How can a pregnant woman get rid of a UTI?

What are the treatment options?
  1. emptying your bladder frequently, especially before and after sex.
  2. wearing only cotton underwear.
  3. nixing underwear at night.
  4. avoiding douches, perfumes, or sprays.
  5. drinking plenty of water to stay hydrated.
  6. avoiding any harsh soaps or body wash in the genital area.

Can I take antibiotics in first trimester?

Antibiotics considered dangerous during pregnancy are riskiest during the first trimester, and many women are prescribed them before they know they're pregnant.

How can I get rid of a UTI while pregnant without antibiotics?

Seven methods for treating UTIs without antibiotics
  1. Stay hydrated. Share on Pinterest Drinking water regularly may help to treat a UTI.
  2. Urinate when the need arises.
  3. Drink cranberry juice.
  4. Use probiotics.
  5. Get enough vitamin C.
  6. Wipe from front to back.
  7. Practice good sexual hygiene.

Can antibiotics cause miscarriage in early pregnancy?

A large study yesterday in the Canadian Medical Association Journal (CMAJ) suggests that the use of certain antibiotics taken early in pregnancy raises the risk of miscarriage.

Can I take UTI medication while pregnant?

Some antibiotic treatments for urinary tract infections (UTIs), such as nitrofurantoin and trimethoprim-sulfamethoxazole, have been linked to birth defects. The American College of Obstetricians and Gynecologists (ACOG) recommends avoiding these antibiotic treatments in early pregnancy if possible.

Why is nitrofurantoin contraindicated in pregnancy?

Nitrofurantoin use in pregnancy continues to be of concern for several reasons. This antibiotic can affect glutathione reductase activity and hence can cause hemolytic anemia (analogous to the problems it causes in patients with glucose-6-phosphate dehydrogenase deficiency).

Does nitrofurantoin cross the placenta?

Nitrofurantoin rapidly crosses the placenta; however, it does so in low concentrations and readily disappears from the fetal circulation. Kallen and colleagues described an association between nitrofurantoin and increased risk for cardiac deficits; however, differences may have been due to confounding factors.

What is the strongest antibiotic for a UTI?

Trimethoprim/sulfamethoxazole, nitrofurantoin, and fosfomycin are the most preferred antibiotics for treating a UTI.

Common doses:

  • Amoxicillin/clavulanate: 500 twice a day for 5 to 7 days.
  • Cefdinir: 300 mg twice a day for 5 to 7 days.
  • Cephalexin: 250 mg to 500 mg every 6 hours for 7 days.

What are the side effects of nitrofurantoin?

What are the possible side effects of nitrofurantoin?
  • severe stomach pain, diarrhea that is watery or bloody (even if it occurs months after your last dose);
  • vision problems;
  • fever, chills, cough, chest pain, trouble breathing;
  • numbness, tingling, or burning pain in your hands or feet;
  • severe pain behind your eyes;

How long does it take for nitrofurantoin to start working?

How long does nitrofurantoin take to work? You should feel better within a couple of days, Stover says. One thing to remember when it comes to this drug: Always finish the course of your medication, even if you no longer have symptoms.

Is nitrofurantoin safe in second trimester?

Nitrofurantoin has also been associated with cardiac birth defects when taken in the first trimester. Given this risk profile, use of nitrofurantoin is best limited to the second trimester. However, nitrofurantoin is also safe and effective for once-daily prophylactic therapy during pregnancy.

Will 3 days of nitrofurantoin work?

Conclusions. It may be concluded that 3-day courses of nitrofurantoin and trimethoprim are less effective than 5- and 7-day courses in the treatment of uncomplicated urinary tract infections in women.

How do you know if a UTI has spread to your kidneys?

Strong, persistent urge to urinate. Burning sensation or pain when urinating. Nausea and vomiting. Pus or blood in your urine (hematuria)

How long does nitrofurantoin stay in your system?

Blood concentrations at therapeutic dosage are usually low. Maximum urinary excretion usually occurs 4-5 hours after administration of macrocrystalline Nitrofurantoin. Urinary drug dose recoveries of about 25-30% are obtained. It has an elimination half-life of about 30 minutes or less.

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