Progendo

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Medically reviewed

Laura Arias

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Progendo

What is Progendo?

Progendo is a pharmaceutical formulation containing a synthetic version of the naturally occurring steroid hormone progesterone. It is primarily used in reproductive medicine and hormone replacement therapy to support various physiological functions regulated by this hormone.

Composition and Mechanism

The active ingredient in Progendo is progesterone, which is chemically identical to the hormone produced by the human ovaries during the menstrual cycle. In many formulations, the progesterone is micronized, meaning the particles are reduced to a very small size to improve absorption and stability within the body.

Progendo works by binding to specific progesterone receptors in target tissues, such as the uterus. Its primary function is to prepare and maintain the lining of the uterus (endometrium), making it receptive for the implantation of a fertilized egg and supporting the early stages of pregnancy.

Clinical Uses

Progendo is utilized in several clinical contexts related to hormonal balance and reproductive health:

  • Support of the Luteal Phase: It is often used during assisted reproductive technology (ART) cycles, such as in vitro fertilization (IVF), to supplement progesterone levels when the body may not produce enough naturally.
  • Endometrial Protection: In hormone replacement therapy for menopausal individuals, it is used alongside estrogen to prevent the overgrowth of the uterine lining.
  • Menstrual Regulation: It may be prescribed to treat amenorrhea (the absence of periods) or abnormal uterine bleeding caused by hormonal imbalances.
  • Pregnancy Support: It is sometimes used in specific cases to help reduce the risk of preterm birth or to support individuals with a history of recurrent pregnancy loss linked to progesterone deficiency.

What side effects are possible with Progendo?

Possible Side Effects and Safety Information

The safety profile of Progendo (progesterone) is based on regulatory documents and clinical studies. This information details the officially documented adverse reactions and significant safety warnings.

Common Adverse Reactions

Side effects reported as Common (typically ge 2%) in clinical trials often involve the gastrointestinal and reproductive systems, and may include:

  • Gastrointestinal: Nausea, abdominal pain, abdominal distension, constipation, and vomiting.
  • Reproductive/General: Post-oocyte retrieval pain, ovarian hyperstimulation syndrome (OHSS), uterine spasm, vaginal bleeding, breast tenderness, fatigue, and headache.

Serious and Clinically Significant Adverse Reactions

Progendo is associated with several serious risks that warrant careful monitoring. Immediate medical attention is necessary if any signs of the following occur:

  • Thromboembolic Disorders: An increased risk of deep vein thrombosis (DVT), pulmonary embolism (PE), stroke, and myocardial infarction (MI) (heart attack). These events may be life-threatening.
  • Vision Loss: Sudden partial or complete loss of vision, or development of retinal vascular lesions.
  • Liver Disease: Symptoms of liver dysfunction, such as jaundice (yellowing of the skin or eyes).
  • Toxic Shock Syndrome (TSS): Reported in cases with vaginal systems, requiring discontinuation if signs (fever, nausea, vomiting, sunburn-like rash) are suspected.
  • Malignancy Risk: An increased risk of invasive breast cancer has been reported with estrogen-plus-progestin therapy.
  • Depression: Worsening symptoms of depression in women with a history of the condition.

Contraindications and Safety Restrictions

Progendo is Contraindicated (should not be used) in patients with specific medical conditions, as defined in official labeling:

Condition Safety Restriction
Thromboembolic Disease History of active DVT, PE, stroke, or MI.
Liver Function Severe hepatic impairment or active liver disease.
Malignancy Known or suspected malignancy of the breast or genitals.
Other Conditions Undiagnosed abnormal genital bleeding or known hypersensitivity to the drug's ingredients.

Special Safety Note: When used for hormone replacement, studies involving estrogen plus progestin therapy have shown an increased risk of probable dementia in postmenopausal women 65 years of age or older. Use with other vaginal products is generally not recommended as it may affect progesterone release.

Overdose and Emergency Response

The regulatory documentation for Progendo defines two categories of overdose-related events.

The first involves non-severe systemic manifestations documented in official labeling, primarily affecting the central nervous system (e.g., drowsiness, dizziness, fatigue) and the gastrointestinal tract (e.g., nausea, vomiting). These signs are officially recognized to subside with discontinuation of the medicine or a reduction in dosage.

The second category mandates immediate emergency action due to the potential for severe, life-threatening outcomes. Regulator-derived instructions require seeking urgent medical help or calling emergency services if the individual presents with collapse, seizure, or difficulty breathing. Immediate attention is also required for signs consistent with thromboembolic events, such as sudden severe headache, sudden loss of vision, or unexplained chest pain or swelling in a limb.

  • Treatment Procedure: The official procedure for overdosage involves the discontinuation of the medicine together with the institution of appropriate symptomatic and supportive care.
  • Antidote: No specific antidote is documented in the official regulatory prescribing information.

Therapeutic Uses of Progendo

What Progendo Treats: Main Uses and Benefits

Progendo is a medication commonly used to help with conditions marked by hormonal fluctuations. The primary therapeutic applications include the supportive management of certain symptoms associated with menopause (when used with estrogen therapy) and addressing the absence of a menstrual period (amenorrhea). Its use contributes to easing the overall symptom load in these common clinical scenarios.

“Progendo assists with easing distress during difficult episodes and contributes to improved day-to-day comfort during symptomatic periods.”


Quick Fact: Support for Hormonal Discomfort


Providing Supportive Management for Hormonal Balance

This domain is considered relevant in contexts marked by increased discomfort or tension during phases of hormonal transition. It provides support that helps ease the overall symptom burden of these episodes.

Assisting with Episodic Physiological Changes

Progendo is used for managing conditions involving recurrent or episodic manifestations, such as the absence of a menstrual period (amenorrhea), assisting with maintaining functional stability of the reproductive cycle.

Used in Contexts Requiring Endometrial Support

In women who still have a uterus and are receiving estrogen therapy, this medication plays a role in managing the risk of symptoms related to heightened physiological activity in the uterine lining. It is considered relevant in situations where support for the uterine lining is needed.

Regulatory References

  1. NIH MedlinePlus overview of Progesterone

Eligibility and Restrictions for Use

Progendo (Progesterone Micronized) eligibility is determined by specific exclusions, restrictions, and established use populations documented in official regulatory labeling.

Contraindicated Populations

Use is contraindicated and must not occur in patients with the following conditions, as stated by regulatory agencies:

  • Known, suspected, or history of breast cancer or other hormone-dependent malignancies.
  • Active deep vein thrombosis, pulmonary embolism, or a history of these conditions.
  • Active arterial thromboembolic disease (e.g., stroke, myocardial infarction), or a history of these events.
  • Severe hepatic dysfunction or disease.
  • Undiagnosed abnormal genital bleeding.
  • Known allergy to the drug's active substance or to any inactive ingredients, such as peanut oil (if present in the formulation).

Restricted and Special Populations

Category Official Regulatory Status
Age Groups Approved for adult women. Use is not established and not indicated in the pediatric population.
Organ Function Severe hepatic dysfunction is a contraindication. Use in mild to moderate hepatic impairment and renal impairment requires caution and monitoring.
Pregnancy/Lactation Should not be used during pregnancy (oral formulation). Use is not recommended while breastfeeding.
Other Conditions Caution is advised for patients with a history of migraine, asthma, epilepsy, or cardiac/renal dysfunction (due to fluid retention potential).

What should I know about interactions with other medicines?

Official Interaction Profile

Progendo (Progesterone Micronized) interactions are defined by its metabolic pathway and documented substance-specific effects, information compiled from official regulatory prescribing data.

Medicinal Product Interactions

The drug’s clearance is affected by enzymes in the liver. Co-administration with known inhibitors of Cytochrome P450 3A4 (CYP3A4), such as Ketoconazole, is officially documented to lead to a pharmacokinetic interaction. This interaction is associated with an increase in the systemic exposure and overall bioavailability of progesterone.

A specific pharmacodynamic interaction is documented when Progendo is combined with conjugated estrogens. This combination results in a measured alteration of circulating estrogen metabolites, including an increase in total estrone and equilin, alongside a reduction in 17β estradiol concentrations.

Interactions with Food and Excipients

Two critical administration constraints are formally stated in regulatory documents. First, the co-ingestion of the capsule with food is shown to increase the systemic bioavailability of the drug compared to when it is taken in a fasting state. Second, due to the presence of peanut oil as an excipient in the capsule formulation, the medication is contraindicated for use in patients with a known hypersensitivity or allergy to peanuts.

Mechanism of Action

Progendo (micronized progesterone) functions primarily as an agonist of the nuclear progesterone receptors (PR-A and PR-B), which are ligand-activated transcription factors present in target tissues such as the uterus, mammary glands, and central nervous system. After cellular entry via passive diffusion, progesterone binds to the inactive cytosolic receptor complex, causing a conformational change and dissociation from heat shock proteins.

The activated hormone-receptor complex subsequently dimerizes and translocates to the nucleus. Here, the dimer binds to specific Progesterone Response Elements (PREs) in the promoter regions of target genes, thereby modulating their transcription. This genomic mechanism regulates the synthesis of specific proteins, leading to changes in cell differentiation, proliferation, and function over hours to days.

Additionally, progesterone acts via non-genomic mechanisms by binding to membrane progesterone receptors (mPRs) and other membrane-associated targets. These interactions rapidly activate intracellular signaling cascades, including the MAPK/ERK and PI3K/Akt pathways, which contribute to the overall systemic physiological modulation, such as the regulation of smooth muscle contractility and neurosteroid activity.

Dosage and Administration Information

How Progendo is Used: Administration Guidelines

Progendo, which contains Progesterone Micronized, is administered following specific instructions. Its use is defined by specific routes, doses, and a required cyclic timing, reflecting the standardized procedural application of the hormone replacement therapy.


Administration Overview

Administration Scope Instruction
Route of Administration The medication is for Oral use and must be swallowed whole as a soft-gelatin capsule.
Frequency Pattern Dosing follows a cyclic, intermittent pattern, requiring the dose to be taken once daily according to a specified sequence.
Dosing for Endometrial Support A dose of 200 mg daily is typically used for endometrial prophylaxis, specifically when administered in combination with estrogen therapy.
Dosing for Secondary Amenorrhea The dose used for secondary amenorrhea is 400 mg daily.

Essential Procedural Conditions

Administration of the capsule is required to occur at bedtime. This timing is a key administration condition, independent of the dose used. Furthermore, while food ingestion is noted to increase the medicine's absorption, other guidelines specify that the capsule should not be taken with food. In cases of severe liver dysfunction, the medication is subject to use restrictions. No formal dosing adjustment guidelines are available for patients with renal impairment, and its use is not recommended in pre-pubescent children.

These instructions define the structured, time-limited regimen that ensures consistent procedural use of the micronized progesterone for its defined indications.

Recent Clinical Evidence

Progendo: Recent Clinical Evidence

Research has evaluated this novel agent in adult patients. The studies investigated the effects across various measures, including symptom severity, duration of flare-ups, and quality of life measures.

Initial Findings

Studies investigated the association between the agent’s effects on enzyme X and a change in the severity of symptoms. Research has not yet clarified the influence of food on absorption.

Key Clinical Trial Results

Phase 3 trials measured chronic pain scores. Comparisons to other treatments were also examined in the research. A difference was measured in the frequency of flare-ups over a period of 6 months in the studied populations. Secondary outcome measures, such as the Patient Global Assessment score, were also evaluated in the trials.

Safety and Tolerability Profiles

Studies did not include participants with pre-existing heart conditions in their primary cohorts, and no data is available on its use in this population.

The most frequently reported events in the studied population were headache, gastrointestinal discomfort, and fatigue. This approach was studied in participants who had not responded to prior treatments. Further research is underway to evaluate the long-term safety profile.

Key Studies & References Oral enzyme combination therapy reduces systemic inflammation, urinary CTXII and pain in knee osteoarthritis: a proof-of-mechanism, randomised, crossover, double-blind, placebo-controlled trial

Frequently Asked Questions (FAQ)

Common questions about Progendo (FAQ)

Q: What is the difference between Progendo and other progestin medications?

A: Progendo contains Progesterone Micronized, a formulation that is chemically identical to the hormone naturally produced by the human body; this is known as bioidentical progesterone. Regulatory information notes that the micronized form is specifically prepared to enhance systemic absorption when the medication is taken by mouth, making oral administration a viable method for systemic delivery.

Q: Is there a generic version of Progendo available?

A: Yes, the active ingredient in Progendo, which is progesterone micronized, is available under the brand name Progendo and as authorized generic versions. These generic options are known simply as Progesterone Capsules.

Q: Is it normal to experience nausea or dizziness after taking Progendo?

A: According to official product information, both nausea and dizziness are listed as commonly reported adverse reactions in clinical data. Dizziness may be more noticeable in the hours immediately following administration of the medication.

Q: Why does Progendo sometimes lead to feelings of confusion or lightheadedness?

A: Official documents list lightheadedness, dizziness, and confusion as possible side effects related to the central nervous system. In some reported cases, these effects may be pronounced. Due to these possibilities, activities that require high concentration should be avoided if such neurological symptoms occur.

Q: Does Progendo cause changes in mood or lead to feelings of depression or anxiety?

A: Official documents describe emotional lability, depression, nervousness, and worry as commonly reported events in clinical trials. Worsening depression in patients with a history of the condition is listed as a serious, clinically significant adverse reaction, and careful monitoring is generally advised for individuals with a history of this condition.

Q: Is it common to have breast tenderness or pain while taking Progendo?

A: Yes, breast pain and breast tenderness are listed among the commonly reported side effects in official safety documents. This is a recognized effect due to the hormonal action of the medication.

Q: Does Progendo cause unusual vaginal discharge or spotting?

A: Vaginal discharge, spotting, and breakthrough bleeding are listed among the common adverse reactions reported in clinical data. Regulatory guidance recommends that unusual or unexpected bleeding be reported.

Q: Can Progendo cause skin changes like acne or increased facial hair?

A: Official documents list skin changes, including acne, as an undesirable effect. Furthermore, changes in hair growth, such as hair loss or gain of body or facial hair, have also been reported in regulatory documents.

Q: Is it possible for Progendo to cause fluid retention or weight gain?

A: Progestin medications are generally known to potentially cause some degree of fluid retention. Additionally, regulatory documents list a change in weight, including both increase and decrease, as an adverse effect reported in clinical settings.

Q: Does Progendo affect blood sugar levels or is it a concern for people with diabetes?

A: Official safety information notes that a decrease in glucose tolerance has been observed in a small percentage of patients using hormone therapy combinations. Because of this, diabetic patients may require careful monitoring during therapy.

Q: Can Progendo affect the results of other blood tests?

A: Official documents note that this medication may interfere with the results of certain laboratory tests, potentially causing false test results. Regulatory information suggests informing lab personnel and healthcare providers that you are taking this drug.

Q: What are the serious, but rare, side effects that require immediate medical attention?

A: Serious, clinically significant risks listed in official documents include signs of blood clots (such as DVT, PE, stroke, or MI), sudden partial or complete vision loss, symptoms of liver disease (like jaundice), and signs of Toxic Shock Syndrome (TSS). Immediate medical evaluation is warranted if any of these signs are suspected.

Q: Are there any specific safety rules regarding driving or operating machinery while on Progendo?

A: Regulatory documents advise that activities requiring concentration, coordination, or reflex action, such as driving or operating machinery, should be avoided if neurological symptoms like drowsiness or dizziness occur after taking the medicine.

Q: Does Progendo have any known interactions with alcohol?

A: Regulatory information indicates that alcohol abuse may increase the systemic bioavailability of the drug, which means more progesterone enters the bloodstream. Furthermore, alcohol consumption may worsen side effects such as dizziness or drowsiness, and official guidance recommends limiting its consumption.

Q: Can Progendo interact with grapefruit juice?

A: Grapefruit juice is noted in regulatory information as a substance that may increase the blood levels of progesterone. This is due to its effect on certain liver enzymes involved in drug metabolism.

Q: Can Progendo interact with common herbal supplements like St. John's Wort?

A: Regulatory information indicates that co-administration with potent liver enzyme inducers may increase the metabolism of progesterone. St. John's Wort is commonly listed as an herbal product that may interact via this enzyme mechanism, potentially leading to altered systemic exposure of the drug.

Q: Are there any known severe interactions between Progendo and antibiotics?

A: Regulatory information indicates that certain antibiotics, such as ampicillin and tetracyclines, may interact with progesterone. This interaction occurs by modifying the intestinal flora, which can lead to a change in the circulation of the hormone.

Q: What does the research say about Progendo's use in combination with estrogen therapy?

A: Official indications and related research confirm the drug is used with estrogen therapy to reduce the risk of changes to the uterus lining. Studies on this combined hormone therapy have also examined themes related to bone mineral density and fracture risk reduction in the studied populations.

Q: How long do the effects of Progendo last after a single administration?

A: Pharmacokinetic studies show that blood levels of progesterone begin to rise within the first hour after oral administration. Concentrations typically reach their peak, or highest level, between one and three hours post-dose.

Q: Is Progendo used to prevent a miscarriage or preterm birth?

A: The approved indications for this oral formulation do not include the prevention of miscarriage or preterm birth. Regulatory documents note that the FDA has approved a distinct progesterone formulation for addressing the risk of recurrent preterm birth.

Q: Why is Progendo sometimes prescribed for women who have had a premature delivery before?

A: The approved indications for this oral formulation do not include the prevention of miscarriage or preterm birth. Regulatory documents note that the FDA has approved a distinct progesterone formulation for addressing the risk of recurrent preterm birth.

Q: What is the official information regarding Progendo and potential birth defects?

A: The oral formulation is typically not recommended for use during pregnancy. While the medication has been studied for luteal phase support in some clinical trials, official information advises that the potential risks and benefits of use should be evaluated by a healthcare provider.

Q: Can men use Progendo for any approved medical conditions?

A: The medication is indicated and approved for use in adult women for specific conditions, such as reducing the risk of endometrial hyperplasia when used with estrogen therapy. Its use in men is not included in the official indications.

Q: Is Progendo approved for use in adolescents or only in adults?

A: Regulatory information indicates the medication is approved for use in adult women. Its use is not established, indicated, or recommended in the pediatric population, which includes adolescents.

Q: Does Progendo affect bone density or increase the risk of osteoporosis?

A: Research concerning the use of this drug in combination with estrogen replacement therapy has shown a beneficial association with reducing total fractures and increasing bone mineral density in the studied populations.

How should Progendo be stored and disposed of?

Official Storage and Disposal Requirements

Storage of Progendo (micronized progesterone capsules) must conform strictly to specific regulatory conditions to ensure product stability.

Requirement Type Official Labeled Condition
Storage Temperature Controlled Room Temperature: 25 C (77 F)
Permitted Excursions Between 15 C and 30 C (59 F and 86 F)
Environmental Protection Protect from excessive moisture and dispense in a tight, light-resistant container
Shelf-Life Constraint Do not use the capsules after the expiration date printed on the packaging
Child Safety Keep the medication out of the sight and reach of children

For disposal, unused or expired capsules are generally recommended for disposal in the household trash. This method should be used unless the medication labeling includes specific instructions for flushing or advises use of an official drug take-back program. Disposal must always follow the instructions provided with the product.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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