Clarithromycin in Pregnancy — Is It Safe?
Last reviewed: · Source: US FDA drug label database
This page contains affiliate links. We may earn a commission if you purchase through them, at no extra cost to you.
Avoid clarithromycin in the first trimester — it has been associated with a small increased risk of miscarriage and birth defects. Azithromycin or amoxicillin are usually safer choices.
Confirm parentage with confidence — order a DNA test at Paternity Lab →
Is it safe to take Clarithromycin with Pregnancy?
Clarithromycin is a macrolide antibiotic that is generally avoided in pregnancy, particularly in the first trimester. A large UK study (CPRD) found first-trimester clarithromycin associated with increased miscarriage risk. Other studies show small signals for cardiovascular and other fetal malformations. Alternative antibiotics with better safety profiles (amoxicillin, azithromycin, erythromycin) are usually available for the same infections. When no safer alternative exists, it can be used in the second and third trimesters, but this is prescriber-led.
How do Clarithromycin and Pregnancy interact?
Clarithromycin is teratogenic in some animal models. Human observational data suggest increased miscarriage and possibly cardiovascular defects with first-trimester use. The mechanism is not fully established but may involve CYP3A4-mediated steroid biosynthesis disruption.
Data sourced from the US Food and Drug Administration (FDA) drug label database: OpenFDA clarithromycin label — pregnancy contraindication; UK CPRD study findings.
As an Amazon Associate we earn from qualifying purchases. We also earn commission from other retail partners. Links below are affiliate links.
Supports bump, back and hips for a more comfortable night's sleep throughout pregnancy.
Check Price →Comprehensive pregnancy supplement with folic acid, iron and vitamin D — NHS recommended nutrients.
Check Price →Week-by-week guide to pregnancy, birth and the first weeks of parenthood.
Check Price →Who should be careful?
All pregnant women — always inform the prescriber that you are pregnant before any antibiotic is prescribed. Alternative antibiotics are available for virtually all common infections.
What if I've already taken Clarithromycin and Pregnancy?
If you took clarithromycin before knowing you were pregnant, contact your midwife and stop taking it. The risk from a short early course is small but should be documented.
Managing multiple medications day to day? AutomationHomeGuide covers smart medication reminders and other home tech that helps.
Confirming a pregnancy raises questions medication alone can't answer.
Paternity Lab offers fast, confidential DNA testing with results in as little as 24 hours.
Order a DNA test at Paternity Lab →Affiliate link — we may earn a commission at no extra cost to you.
This page contains affiliate links. We may earn a commission if you purchase through them, at no extra cost to you.
CJ — PATERNITY LABPaternity Lab — fast, confidential DNA testing. Results in as little as 24 hours. Discreet delivery to your door. Court-admissible results also available.
Order a DNA test at Paternity Lab →This page contains affiliate links. We may earn a commission if you purchase through them, at no extra cost to you.
CJ — LAWDEPOTLawDepot — legal documents made simple. Child travel consent forms, wills, power of attorney and more — fill in online, print immediately.
Create legal document at LawDepot →Curious what a DNA test can reveal beyond parentage? 247GeneticCheck covers health and ancestry testing alongside DNA verification.
Frequently Asked Questions
Can I take clarithromycin while pregnant?
It's best avoided, especially in the first trimester. Tell your prescriber you are pregnant — safer alternatives are usually available.
What antibiotic can replace clarithromycin in pregnancy?
For chest infections: amoxicillin or azithromycin. For H. pylori: H. pylori treatment is generally deferred until after pregnancy. Ask your prescriber.
I took clarithromycin in early pregnancy — should I worry?
Stop taking it and inform your midwife. The absolute risk from a short early course is small, but it should be on your pregnancy record. Your anomaly scan will include standard checks.
Is azithromycin safer than clarithromycin in pregnancy?
Yes — azithromycin has more reassuring pregnancy data and is generally the preferred macrolide in pregnancy when a macrolide is needed.