During menopause, your estrogen levels decline, giving rise to symptoms like vaginal dryness, hot flashes, and sleep disturbances. Many turn to hormone replacement therapy (HRT) for relief. If you’re considering HRT, you’ll likely need to add progestin to protect your uterine health. Two common options include norethindrone and medroxyprogesterone. Understanding the differences between them can help you find a treatment plan that fits your body.

Both medications aim to protect your uterus from estrogen-driven overgrowth. However, they each have distinct chemical structures, delivery methods, and safety profiles. Read on as we unpack norethindrone versus medroxyprogesterone and what you need to know to make an informed decision with your care team.

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What are norethindrone and medroxyprogesterone?

Norethindrone and medroxyprogesterone are both synthetic progestins, meaning they’re man-made versions of the hormone progesterone. Because they belong to the same functional family, these medications both activate progesterone receptors in the body to trigger effects similar to natural progesterone. 

These active ingredients can both be used as birth control or HRT:

• Birth control: Progesterone-only birth control (the minipill, patch, or injection) prevents pregnancy by thickening cervical mucus, thinning the uterine lining, and often suppressing ovulation.
• HRT: Combined estrogen-progesterone therapy (EPT) adds progesterone or progestin (progestogens) to estrogen to counteract thickening of the uterine lining, reducing the risk of endometrial cancer in menopausal people. 

What’s the role of progestins in HRT?

Unopposed estrogen can drive the abnormal thickening of the uterine lining (endometrial hyperplasia). When the cells in the uterine lining divide rapidly without breaks, DNA mistakes or mutations can happen, progressing into endometrial cancer. Progesterone protects against this risk by preventing cells from multiplying, triggering cell maturation so the cells die off naturally, and causing the uterine lining to shed to reduce overgrowth. By mimicking natural progesterone’s role in the body, norethindrone and medroxyprogesterone do this, too.

Here are some examples of HRT products containing norethindrone and medroxyprogesterone:

• Activella®: A once-daily oral tablet that combines norethindrone acetate with estradiol, which is a bioidentical form of estrogen 
• CombiPatch®: A transdermal patch, applied twice weekly, that also delivers norethindrone acetate and estradiol 
• Prempro®: A once-daily tablet that pairs medroxyprogesterone acetate with a nonbioidentical form of estrogen called conjugated estrogens

For people with a uterus, doctors generally prescribe EPT—many including either norethindrone or medroxyprogesterone. However, you can still take EPT if you’ve had your uterus removed (total hysterectomy). Progestin may help improve mood and sleep and manage endometriosis post-hysterectomy.

How are norethindrone and medroxyprogesterone different?

Despite their shared uses, norethindrone and medroxyprogesterone diverge in their chemical structures:

• Norethindrone is a 19-nortestosterone derivative, meaning its molecular structure is chemically based on testosterone.
• Medroxyprogesterone is a 17α-hydroxyprogesterone derivative whose chemical structure is derived directly from progesterone itself. 

This chemical difference changes how each medication impacts the body. In norethindrone’s case, the main driver is the drug’s testosterone-related structure. Testosterone belongs to a class of hormones called androgens. These hormones react with androgen receptors (ARs), which influences the body in several ways. For example, androgens tend to increase oil production. Norethindrone activates the same receptors, so patients might see more acne or oil on their skin. AR activation can be beneficial, too—it may support aspects of sexual function.

Medroxyprogesterone carries less androgenic activity, although it may drive some. The drug primarily acts on progesterone receptors. In the brain, this most affects the hypothalamus, the body’s main control center. The hypothalamus makes a hormone called gonadotropin-releasing hormone (GnRH). GnRH tells the system to release luteinizing hormone (LH), which helps the reproductive system ovulate. During perimenopause, LH levels rise, which can make periods irregular. Medroxyprogesterone slows GnRH production. As a result, cycles regulate.

Those aren’t the only differences between the medications. Here’s a table that compares the two side by side:

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Can norethindrone and medroxyprogesterone be used in menopause?

Yes. Although both norethindrone and medroxyprogesterone are commonly used in contraceptive medications, they can play key roles in menopause care, too. 

If you’re taking estrogen to manage menopause symptoms like hot flashes or night sweats, and you still have your uterus, you should take a progestogen alongside it. This prevents your uterine lining from overgrowing and developing endometrial hyperplasia and cancer. The FDA approves Provera® and generic medroxyprogesterone for this use. Norethindrone isn’t FDA-approved for this use, but many doctors prescribe it off-label for this reason.

If you prefer a simpler regimen, you can take an all-in-one combination pill (or patch) that blends estrogen and a progestin. Norethindrone EPT includes brands like Activella® and CombiPatch®, while medroxyprogesterone EPT includes Prempro® and Premphase®.

Side effects, contraindications, and serious adverse events

Because they’re both progestins, norethindrone and medroxyprogesterone share many of their side effects and risks. However, there are still key differences.

Side effects of norethindrone and medroxyprogesterone

The common side effects of these drugs include:

• Vaginal bleeding or spotting
• Headache
• Nausea
• Breast tenderness or pain
• Dizziness 
• Diarrhea
• Mood instability
• Acne
• Mild rash

These side effects are typically mild and improve with time. 

Contraindications

A contraindication is a circumstance or condition that makes a medication unsafe for you. Contraindications vary across HRT products. Before prescribing, your doctor will talk with you about the risk factors of your specific treatment:

EPT products containing these progestins often have the same contraindications. Before prescribing any, your doctor will identify any risk factors. As you progress through treatment, they’ll continue to monitor for any warning signs. 

Serious adverse events

While serious adverse events are uncommon when doctors prescribe these medications appropriately, both norethindrone and medroxyprogesterone carry potential health risks:

• Cardiovascular and blood clots: Both drugs carry risks for deep vein thrombosis (DVT), pulmonary embolism (PE), stroke, and heart attack.
• Liver function: Both medications can impact the liver, carrying risks for jaundice, liver injury, or liver dysfunction.
• Vision changes: Both have been associated with visual disturbances and nerve-related eye issues like optic neuritis and retinal thrombosis.

However, there’s one key difference. An observational study published in the Journal of Thrombosis and Haemostasis attributes greater venous thromboembolism (VTE) risk to medroxyprogesterone than norethindrone in postmenopausal individuals. Though this requires further research, the reason is thought to have to do with differences in chemical structure, potency, and delivery method.

Before prescribing either medication, your doctor will screen for all risks to find a suitable path forward for you. 

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How much do these progestins cost?

The cost of each of these medications depends largely on which medication your doctor prescribes, as well as your individual insurance coverage. 

Here are examples across HRT types. 

Combined therapy

• Estradiol/norethindrone: Activella® costs $282.33 out of pocket for 28 tablets (0.5 mg to 1 mg). Generic estradiol/norethindrone typically costs $38–$48 out of pocket for the same quantity and dose. 
• Conjugated estrogens and medroxyprogesterone: Prempro® costs $256.30 out of pocket for 28 tablets (0.3 mg to 1.5 mg). There isn’t currently a generic option available for this medication.

Progestin-only therapy (monotherapy)

• Generic oral norethindrone: Generic norethindrone tablets cost approximately $25 for 30 tablets (5 mg). 90 tablets of the same dose jump to approximately $67. 
• Medroxyprogesterone: Provera® costs $263.61 out of pocket for 100 tablets at 2.5 mg. Generic medroxyprogesterone typically costs about $15 out of pocket for the same quantity and dose.

Navigating insurance can be challenging. If you need a hand, reach out to our team at Maven Clinic. We can help you understand your options. 

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Get personalized hormone care at Maven Clinic

Deciding whether to incorporate norethindrone or medroxyprogesterone into your menopause care isn’t a choice you should make alone. At Maven Clinic, our specialists look closely at your unique health history, lifestyle preferences, and symptom goals to find the right treatment path for you.

Like our patient, Debbie, expressed: "I started using Maven because I was looking for answers and support during perimenopause. What stood out immediately was how understood I felt. The providers didn't dismiss my symptoms. They helped me make sense of the changes happening in my body and gave me practical, personalized support." 

Discover our approach to hormone care.