I get asked quite often, “Are there peptide therapies that can help prevent recurrent UTIs, especially during perimenopause and after menopause?”
There are antimicrobial peptide (AMP’s) antibiotics, such as the polymyxins, but their role in UTIs is very limited. Colistin may be considered for certain highly resistant urinary infections when other treatment options aren’t appropriate. However, because of toxicity concerns (particularly with the kindeys), it is not a routine first-line treatment, and these peptide antibiotics are not used to prevent recurrent UTIs.
So, when it comes to preventing recurrent UTIs, the answer is a little different: we don’t currently have peptide therapies with established clinical evidence for preventing recurrent UTIs.
That brings us to something that does have an established role in reducing recurrent UTIs in peri- and post-menopausal women: vaginal estradiol.
If you’re going through menopause and suddenly finding yourself dealing with repeated UTIs, you’re not imagining it. This symptom can be connected.
One important piece of the puzzle is declining estrogen.
Today, we’re going to talk about how vaginal estradiol works, why it can help prevent recurrent UTIs, the different products available, why the ingredients in those products can matter if you have sensitive tissue, and what to do if vaginal estrogen causes burning or irritation.
Let’s get into it.
Why does estrogen matter to the vagina and urinary tract?
When estrogen levels decline during and after menopause, changes can occur in the tissues of the vagina, vulva, urethra, and lower urinary tract.
Think of the vagina and urethra as neighbors, they’re really close together and share the same environment. Because of this, bacteria that cause UTIs can get into the urethra and travel up to the bladder.
Normallly, when estrogen levels are healthy, the vaginal tissues tend to be thicker, better hydrated, and supported by beneficial bacteria called Lactobacilli.
But as estrogen declines, the tissues can become thinner, drier, and more fragile. The vaginal microbiome can also change. Lactobacilli may decrease, and vaginal pH can become less acidic.
So, why does that matter?
Lactobacilli help create an environment that makes it harder for potentially harmful bacteria, including E. coli, to thrive.
So when estrogen declines, several things can happen at once: the tissues become more vulnerable, the vaginal environment changes, and bacteria may have an easier time colonizing the area around the urethra.
And that can contribute to recurrent UTIs.
So how can vaginal estrogen help prevent another UTI?
Vaginal estrogen is not an antibiotic.
It doesn’t treat an active UTI or kill the bacteria causing an infection.
Instead, it helps address some of the underlying changes that happen when estrogen levels decline.
By restoring estrogen locally, vaginal tissues can become healthier and better supported. The vaginal environment can also become more favorable to protective Lactobacilli and a more acidic pH.
That may make it harder for UTI-causing bacteria to establish themselves around the urethra and eventually travel into the bladder.
So we’re not just treating the infection.
We’re trying to change the environment that may be contributing to those repeat infections.
And this is why vaginal estradiol can be so helpful for the right patient.
The American Urological Association’s 2025 recurrent UTI guideline specifically recommends vaginal estrogen for appropriate peri- and post-menopausal women with recurrent UTIs to reduce the risk of future infections.
What else can vaginal estrogen help with?
UTI prevention is really only part of the story.
Vaginal estrogen can also help with symptoms of genitourinary syndrome of menopause (GSM).
That can include:
- Vaginal dryness
- Burning or irritation
- Vulvar discomfort
- Pain with sex
- Tissue fragility
- Some urinary symptoms
- Urinary urgency and frequency in some women
And the goal isn’t simply to cover up the symptoms.
We’re trying to restore the health of estrogen-responsive tissues.
For some women, that means sex becomes more comfortable. For others, the biggest improvement may be fewer UTIs or better urinary symptoms.
And for some women, it’s all of the above.
Are all vaginal estrogen products basically the same?
A question I’m often asked is, “Are all vaginal estrogen products basically the same?”. This is where things get interesting.
Many vaginal estrogen products contain the same active hormone: estradiol.
But estradiol is only one part of the product.
The rest of the formulation, the inactive ingredients, can be very different from one product to another. And if you have very sensitive vaginal or vulvar tissue, those differences may matter.
Let’s look at a few of the common options.
Estrace vaginal cream
The first product I’d like to discuss is Estrace vaginal cream. Estrace contains estradiol 0.01%.
That means each gram contains 0.1 milligrams, or 100 micrograms, of estradiol.
But the cream contains much more than estradiol. It also contains ingredients that help create the right texture, consistency, stability, and shelf life.
For example, it contains propylene glycol and sodium lauryl sulfate (SLS), amongst many others. Now, I want to be clear: I’m not saying these ingredients are bad or unsafe. They each have a purpose in the formulation.
But if you have extremely sensitive or inflamed tissue, sometimes the inactive ingredients can be part of the reason a particular product feels irritating.
And that’s important because if a vaginal estrogen burns, it doesn’t automatically mean you’re reacting to the estrogen itself.
Also, formulations can vary between products, so always check the actual prescribing information for the specific product you’re using.
What about Vagifem?
Vagifem is different from Estrace cream because it’s a vaginal estradiol tablet insert rather than a cream.
The commonly used Vagifem insert contains 10 micrograms of estradiol.
Again, estradiol isn’t the only ingredient. The insert also contains things like lactose, maize starch, and magnesium stearate, along with ingredients in the film coating.
These ingredients are there to give the tablet its structure and allow it to be manufactured and delivered appropriately.
And again, they’re not inherently harmful.
But if you have sensitive tissue, you may find that you tolerate one formulation better than another.
Some women also simply prefer an insert because it’s less messy than a cream.
Vagifem is inserted using the applicator, which is gently placed into the vagina and pressed to release the 10 mcg insert.
Estring
Another option is Estring.
Estring is a low-dose vaginal estradiol ring that releases approximately 7.5 micrograms of estradiol per day and is designed to stay in place for about 90 days.
For some women, that’s incredibly convenient because you don’t have to remember to apply a cream or insert several times a week.
The ring provides a continuous, low dose of estrogen.
With all of these products, a small amount of estradiol is absorbed into the bloodstream. The goal, however, is primarily to treat the vaginal tissues locally, rather than to achieve the higher estrogen levels seen with oral systemic hormone therapy.
What about Femring?
This is an important distinction because the names sound almost identical.
Estring and Femring are not interchangeable.
There is another product I would like to mention before we move along: Femring.
Femring is different. It delivers a substantially higher amount of estradiol systemically, meaning the estrogen is absorbed into the bloodstream and circulates throughout the body.
Femring is available in doses of 0.05 or 0.10 milligrams per day, and it’s considered a form of systemic estrogen therapy, not just local vaginal estrogen treatment.
Estring, on the other hand, is a much lower-dose vaginal ring designed primarily to provide estrogen locally to the vaginal and urinary tissues.
So if your doctor says, “Let’s use an estrogen ring,” make sure you know which ring they’re talking about.
Estring and Femring are not simply two brands of the same medication—they’re designed to deliver estrogen differently and have different effects throughout the body.
Femring and Estring are inserted by gently squeezing the ring and placing it into the vagina as far as comfortable, where they remain in place for 90 days.
*How do you actually use vaginal estrogen cream?
Estradiol creams commonly come with an applicator, and the product labeling provides instructions for using it.
But if your vaginal tissue is very thin, dry, or irritated, inserting an applicator may itself cause discomfort. In that situation, your clinician may recommend applying the cream with a clean finger instead. This can be gentler and gives you more control over where the cream goes.
If your clinician instructs you to use about one inch of cream, one simple way to visualize that amount is to place the cream along the back of your index finger, from the fingertip toward approximately the second knuckle.
If your clinician does recommend using the applicator, be gentle. Don’t force an applicator into tissue that is painful or fragile. And if insertion hurts, talk with your healthcare professional about another approach.
*Where does the cream exactly go?
The vagina is one target, but remember that the vulva and the tissue around the urethral opening can also become dry and irritated when estrogen levels decline.
Depending on your symptoms and your clinician’s instructions, a small amount may be applied to the vaginal and external tissues.
The important thing is to be gentle.
You don’t need to aggressively rub the medication into the tissue.
If the tissue is very dry or inflamed, even friction can cause burning.
*Estradiol Cream Dosing
Typically, when starting estradiol vaginal cream, you’ll apply it vaginally once daily for 10 days. After that initial period, the dose is usually reduced to a maintenance schedule of 1–3 times per week, depending on your individual needs and your clinician’s recommendations.
Always follow the specific dosing instructions provided by your healthcare professional, as the appropriate dose and frequency can vary.
*What if vaginal estrogen cream burns?
This is probably one of the most common concerns/complaints I hear.
And here’s the important thing, burning does not automatically mean you’re allergic to estrogen.
There are several possibilities.
First, the tissue itself may be extremely sensitive.
If the vaginal or vulvar tissue is dry, thin, or inflamed, almost anything you put on it can sting.
Think about putting lotion on severely chapped skin or chapstick on cracked, dry lips. Even something that normally feels completely comfortable can burn.
Second, there can be friction.
Remember, if an applicator is rubbing against fragile tissue, the mechanical irritation itself can cause burning.
Third, it could be the formulation.
Remember all those inactive ingredients we just talked about? Different products contain different ingredients, and occasionally someone may be sensitive or irritated by one of them.
And fourth, the burning may have nothing to do with the estrogen at all.
Think about everything else that touches that area:
- Soaps
- Body washes
- Wipes
- Lubricants
- Bubble baths
- Laundry products
- Other topical medications
And sometimes there may be an infection, a vulvar skin condition, or another source of pain that needs to be evaluated.
So if you’re experiencing burning, don’t automatically conclude, “Estrogen doesn’t work for me.”
You need to figure out why you’re burning.
One important warning: bleeding
If you’re postmenopausal and experience unexpected vaginal bleeding, don’t simply assume it’s from the estrogen.
Postmenopausal bleeding deserves evaluation.
That doesn’t mean something serious is necessarily happening. It simply means there are several possible causes of bleeding after menopause (e.g., polyps, endometrial thickening), and your clinician needs to determine the reason.
So unexpected or persistent bleeding should always be discussed with your healthcare professional.
What about estrogen and blood clots?
Before we close out the podcast. I want to discuss one of the biggest misconceptions about hormone therapy is that all estrogen carries the same risk of blood clots. It doesn’t.
The type of estrogen, and how you take it, matters.
For example, transdermal estrogen, such as patches, gels, and sprays, appears to have a more favorable clotting profile than oral estrogen. Observational studies have generally not shown an increased risk of blood clots with transdermal estrogen compared with baseline risk.
Oral estradiol, on the other hand, is associated with a small increase in clot risk.
And combined hormonal birth control is a different category altogether. Birth control pills that contain ethinyl estradiol are associated with a higher risk of blood clots than menopausal hormone therapy.
So when we’re talking about estrogen and clot risk, we can’t simply say, “Estrogen increases your risk of blood clots.”
The type of estrogen matters. The dose matters. And the route, how that estrogen gets into your body, matters.
Thanks again for listening to The Peptide Podcast.
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Until next time, be well, and have a happy, healthy week.
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