Ovestin with antibiotics: interactions and safety
Antibiotic courses are common, short-term and often combined with chronic medications such as Ovestin (Estriol). Most antibiotics do not interfere meaningfully with Estriol at 0.1%, 0.5mg, 1mg, 2mg, but a few classes do, and a small number of combinations are best avoided.
Common antibiotic interactions
Macrolides (clarithromycin, erythromycin) and certain antifungals can inhibit hepatic metabolism (CYP3A4) and raise plasma levels of many medications including some Hormones and Birth Control agents. Rifampicin has the opposite effect, accelerating metabolism. Most penicillins, cephalosporins, fluoroquinolones and tetracyclines have no clinically meaningful interaction with Estriol at 0.1%, 0.5mg, 1mg, 2mg.
Practical guidance
According to the prescribing information for Estriol, an antibiotic course should be reviewed by the prescriber or pharmacist for known interactions before Ovestin is co-administered. Adjusted 0.1%, 0.5mg, 1mg, 2mg dosing or temporary substitution is sometimes preferred for the duration of the antibiotic course.
Frequently asked questions
Can I take Ovestin during an antibiotic course? ▾
For most common antibiotics, yes. A few classes — notably macrolides and azole antifungals — alter how Estriol is metabolised and may need a temporary 0.1%, 0.5mg, 1mg, 2mg adjustment. The prescribing pharmacist should review any new antibiotic against the existing Ovestin regimen.
Will antibiotics make Ovestin stop working? ▾
Most antibiotics do not affect Ovestin efficacy. Rifampicin and a few others can lower Estriol levels and reduce effect; in those cases the prescriber may adjust the dose during and shortly after the antibiotic course.
More on Ovestin
- With alcoholOvestin and alcohol — is it safe to drink?
- With foodShould Ovestin be taken with food?
- Side effectsOvestin side effects: common, rare and warning signs
- Dosage guideOvestin dosage guide: how much to take and when
- OnsetHow fast does Ovestin start working?
- DurationHow long does Ovestin last?
The information on this website is provided for reference and educational purposes only. It does not replace consultation with a qualified healthcare professional.