Comparison · Pregnancy Smart
Antibiotics for a sinus infection in pregnancy
How do the options compare?
Options are compared on ACOG or MotherToBaby endorsement, size and quality of pregnancy-specific studies, dosing predictability, time-to-effect, and side-effect profile: the same axes an obstetric clinician would use.
| Option | Studied pregnancy dose | Guideline support | Notes |
|---|---|---|---|
| Amoxicillin | 5 to 10 days as initial antibiotic therapy for acute rhinosinusitis | Most studies have not found an increased chance of birth defects when amoxicillin is taken during the first trimester, and MotherToBaby concludes the chance of cleft lip or palate is expected to be low | A 2021 study found amoxicillin as effective as amoxicillin-clavulanate for acute sinusitis while causing fewer adverse gastrointestinal symptoms, which matters if you are already nauseated |
| Amoxicillin-clavulanate | Also 5 to 10 days as initial therapy, when a provider judges the added coverage is warranted | Carries the same MotherToBaby fact sheet as amoxicillin, with most studies finding no increased chance of birth defects in the first trimester | The clavulanate adds gastrointestinal side effects without added effectiveness in the study cited above. It also enters breast milk in small amounts not expected to cause side effects in most nursing infants |
| Azithromycin | Per your provider's prescription; commonly used for sinus infections | A few studies have suggested azithromycin might increase the chance of some birth defects, but most studies have not found an increased chance when it is used during pregnancy | Short-term use is generally considered compatible with breastfeeding, though some studies suggest the chance of pyloric stenosis might be increased when it is taken during the first two weeks of nursing |
| Tetracycline class (including doxycycline) | Generally avoided after the 4th month of pregnancy | It has been suggested that tetracycline be avoided after 4 months of pregnancy unless there is a reason for your healthcare provider to prescribe it | Taken after month 4, there is a chance the baby teeth come in gray or yellowish brown. Overall, the available information on tetracycline has not shown an increased chance of birth defects |
- Bacterial sinusitis complicates only 0.5% to 2% of cases of viral sinusitis, antibiotic therapy should be started only if symptoms persist more than 7 days without improvement or worsen after an initial improvement, and the recommended initial course is amoxicillin with or without clavulanate for 5 to 10 days. 1
- Most studies have not found an increased chance of birth defects when amoxicillin or clavulanic acid are taken during the first trimester, and the chance of cleft lip or palate is expected to be low with first-trimester use. 2
- A few studies have suggested azithromycin might increase the chance of some birth defects, but most studies have not found an increased chance when it is used during pregnancy, and short-term use is generally considered compatible with breastfeeding. 3
- If tetracycline is taken after the 4th month of pregnancy there is a chance of discoloration of the baby teeth, and the standing suggestion is to avoid it after 4 months unless a provider has a reason to prescribe it. 4
- For anyone nursing, clarithromycin passes into milk in minimal amounts, with a peak milk level of 0.85 mg/L at 2.2 hours and an exclusively breastfed infant receiving less than 1% of the recommended pediatric dosage. 5
Which option makes sense?
A comparison can include options that should be avoided or considered only in specific circumstances. Please consult your healthcare provider about the findings and cautions that apply to you.
Disclosure: Pregnancy Smart offers a supplement that overlaps with one or more options above. This page describes the pregnancy evidence for each option on its own merits.
Frequently asked questions
Do I need antibiotics for a sinus infection while pregnant?
Probably not, on the numbers. Bacterial sinusitis complicates only 0.5% to 2% of viral sinus infections, so the overwhelming majority resolve without a prescription. The published trigger for starting antibiotics is symptoms persisting more than 7 days without improvement, or worsening after you had started to improve.
Which antibiotics should be avoided in pregnancy?
The tetracycline class is the clearest example on this page. Taken after the 4th month, there is a chance of permanent discoloration of the baby teeth, and the standing suggestion is to avoid it past that point unless your provider has a specific reason. Your prescriber checks each drug against your stage.
How long does a sinus infection last in pregnancy?
The seven-day mark is the useful landmark: antibiotics are only considered once symptoms have persisted more than 7 days without improvement, or have worsened after an initial improvement. That framing tells you a week of feeling awful is expected, not a sign that something was missed.
Is amoxicillin safe during pregnancy?
MotherToBaby reports most studies have not found an increased chance of birth defects with first-trimester amoxicillin. A few studies showed a higher chance of cleft lip or palate and others did not, with the overall chance expected to be low. It also enters breast milk in small amounts not expected to cause problems.
When does a sinus infection need to be seen?
When it crosses the seven-day line without improving, when it improves and then gets worse, or when it comes with a fever you cannot bring down. Pregnancy is not a reason to tough it out longer; it is a reason to have the conversation sooner so the prescriber can weigh the specific drug against your stage.
Related in the library
Symptoms
Sinus infections during pregnancy (rhinosinusitis)
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Is amoxicillin safe during pregnancy?
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Is Z-Pack safe during pregnancy?
Symptoms
Nasal congestion and pregnancy rhinitis
Comparisons
Saline rinse vs decongestant spray pregnancy
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Is neti pots and nasal irrigation safe during pregnancy?
Comparisons
Best pregnancy-safe fever reducer
References
Recurrent Acute Rhinosinusitis, StatPearls
StatPearls · https://www.ncbi.nlm.nih.gov/books/NBK459372/
Amoxicillin: MotherToBaby Fact Sheet
MotherToBaby · https://mothertobaby.org/fact-sheets/amoxicillin/
Azithromycin: MotherToBaby Fact Sheet
MotherToBaby · https://mothertobaby.org/fact-sheets/azithromycin/
Tetracycline: MotherToBaby Fact Sheet
MotherToBaby · https://mothertobaby.org/fact-sheets/tetracycline-pregnancy/
Clarithromycin, Drugs and Lactation Database (LactMed)
NIH LactMed · https://www.ncbi.nlm.nih.gov/books/NBK501207/
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.