Pempro

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Pempro

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Medically reviewed

Rosario Oropesa

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 Pempro

Understanding Pempro

Pempro is a prescription medication used in hormone replacement therapy (HRT). It is a combination drug that contains two types of hormones: conjugated estrogens and medroxyprogesterone acetate. This medication is typically used by women who have a uterus and are seeking to manage symptoms associated with menopause.

How It Works

As women approach menopause, the body's natural production of estrogen and progesterone decreases. This hormonal shift can lead to various physical changes. Pempro works by supplementing these hormone levels:

  • Conjugated Estrogens: These are a mixture of estrogen hormones that help replace the estrogen the body is no longer producing in sufficient amounts. This component addresses common menopausal symptoms.
  • Medroxyprogesterone Acetate: This is a progestin (a synthetic form of progesterone). Its primary role in this combination therapy is to protect the lining of the uterus. When estrogen is taken alone, it can cause the uterine lining to overgrow; adding a progestin helps to reduce this risk.

Purpose of the Combination

The dual-hormone approach of Pempro is designed specifically for individuals who have not undergone a hysterectomy. By providing both estrogen and progestin in a single administration, the medication aims to balance the hormonal needs of the body while maintaining uterine health during the transition through menopause.

What side effects are possible with Pempro?

Possible Side Effects and Safety Information

The official safety profile for Pempro (Pemetrexed disodium) is established through regulatory classifications that document adverse reactions by frequency and physiological system. Hematological toxicities (blood and lymphatic system disorders) and Gastrointestinal disorders constitute the most frequently observed categories.

Adverse reactions are classified in regulatory documents:

  • Very Common (more than 1 in 10 patients): Fatigue, nausea, vomiting, diarrhea, anorexia, neutropenia, leukopenia, anemia, stomatitis/pharyngitis, and rash.
  • Common (up to 1 in 10 patients): Febrile neutropenia, thrombocytopenia, constipation, abdominal pain, peripheral neuropathy, and pruritus.

Serious Adverse Reactions are specifically highlighted in prescribing information, including the risk of severe bone marrow suppression (myelosuppression), which can lead to life-threatening infection, severe and potentially fatal acute renal failure, and severe cutaneous reactions such as Stevens-Johnson syndrome.

Population-Specific Safety Considerations are defined in official labeling. Use is contraindicated in patients when creatinine clearance is less than 45 mL/min, reflecting a major renal safety restriction. The drug also carries the potential for fetal harm, and effective contraception is advised for both male and female patients of reproductive potential during and following treatment. Administration is further restricted by hematological baselines: the drug must not be given if the Absolute Neutrophil Count (ANC) is less than 1500 cells/mm^3 or the platelet count is less than 100,000 cells/mm^3.

Overdose and Emergency Response

The official regulatory labeling for Pempro (Pemetrexed disodium) describes overdose primarily through the exaggeration of its known toxic effects, which requires immediate medical attention.

Documented Manifestations and Severe Outcomes

Overdosage is associated with severe toxicities to the haematopoietic system. Manifestations include severe myelosuppression (bone marrow suppression), which results in critical laboratory findings like neutropenia, anaemia, and thrombocytopenia (low blood cell counts). Anticipated severe complications of this systemic overexposure include life-threatening infection (which may present with or without fever) and significant mucosal injuries such as mucositis and persistent diarrhoea. Other reported signs may include rash and sensory polyneuropathy.

Emergency Actions and Management

Due to the risk of severe myelosuppression and infection, immediate medical help must be sought for any suspected overdose. The management of overdose, as stated in regulatory documents, requires patients to be monitored with blood counts to determine the level of toxicity. While no drug is universally approved specifically for overdose treatment in all jurisdictions, the administration of calcium folinate (folinic acid) should be considered as a rescue measure to mitigate the effects of the overexposure. Supportive therapy is required as necessary to manage any ensuing complications.

Therapeutic Uses of Pempro

What Pempro treats: Main Uses and Benefits

Pembrolizumab (stylized as Pempro) is considered a key medication in cancer immunotherapy, an approach that is applied in addressing oncologic conditions by supporting the body’s immune system. This therapeutic support is relevant across various tumor types when symptoms become more noticeable.

The official indications for this medication are extensive, covering conditions characterized by systemic or localized discomfort caused by cancer. It is commonly used across conditions presenting with acute episodes or significant symptomatic burden. Key indications include melanoma, non-small cell lung cancer (NSCLC), head and neck squamous cell carcinoma (HNSCC), renal cell carcinoma (RCC), classical Hodgkin lymphoma (cHL), and a broad category of microsatellite instability-high (MSI-H) solid tumors. By easing the effects of the disease, treatment may assist with maintaining functional stability and contributes to easing the overall symptom load during symptomatic periods.

Quick Fact: Is commonly used to help with symptoms that interfere with daily functioning.

“This type of therapy may assist with maintaining a sense of stability when symptoms related to systemic imbalance are more noticeable.”

Eligibility and Restrictions for Use

Pempro (Pemetrexed) eligibility is strictly defined by regulatory guidelines based on the patient's health status and certain pre-existing conditions. All eligibility rules are based on official government labeling.

Populations Who Must Not Use Pempro

Use is formally contraindicated for patients with a known history of severe hypersensitivity to Pemetrexed or its excipients. Pemetrexed is also contraindicated in women who are currently breastfeeding. Furthermore, official labeling advises against use in patients who are concurrently receiving the yellow fever vaccine.

Condition-Based and Restricted Use

Patients with severely impaired kidney function, defined as a Creatinine Clearance ( CrCl) less than 45 mL/min, are not recommended to use the medicine. Eligibility depends on hematologic status, requiring a minimum of ANC geq 1500 cells/mm^3 and Platelets 100,000 cells/mm^3 before each cycle. The drug is not indicated for patients with squamous cell non-small cell lung cancer histology. Patients with mild-to-moderate renal impairment ( CrCl 45-79 mL/min) must avoid taking NSAIDs during the treatment window.

Age and Reproductive Status

Pempro is primarily for use in adult patients. Safety and effectiveness have not been established in the pediatric population (under 18 years). Use during pregnancy is not recommended due to the risk of Embryo-Fetal Toxicity, and women of reproductive potential must use effective contraception during and after treatment.

What should I know about interactions with other medicines?

Pempro (Pemetrexed disodium) has specific, documented interactions that are based on its primary elimination pathway and formal regulatory constraints. The co-administration of certain Non-Steroidal Anti-Inflammatory Drugs (NSAIDs), such as ibuprofen, may compete for active transport and reduce Pempro's clearance from the body via renal tubular secretion. This pharmacokinetic interaction is documented to increase the systemic exposure (Area Under the Curve, or AUC) of the medicine.

This heightened exposure substantially increases the official risk of severe toxicity, including myelosuppression and renal toxicity, especially in patients with mild to moderate renal impairment (creatinine clearance 45 to 79 mL/min). To manage this risk, official prescribing information mandates specific timing constraints. Short half-life NSAIDs must be avoided for a five-day window: two days before, on the day of, and two days following the infusion. Longer half-life NSAIDs require an interruption period of at least eight days.

Additionally, certain combinations are prohibited. The Yellow Fever Vaccine is formally contraindicated due to the potential for systemic adverse reactions. Conversely, the co-administration of Folic Acid (oral) and Vitamin B12 (intramuscular) is officially required as mandatory supplements to interactively reduce the severity of documented hematologic and gastrointestinal toxicities. These requirements establish the core constraints of the drug's official interaction profile.

Mechanism of Action

Targeted Blockade of DNA Building Blocks

This primary mechanistic domain involves the multi-site inhibition of key enzymes involved in nucleotide synthesis, most notably Thymidylate Synthase (TS). Pemetrexed acts as a folate analog to competitively block these targets, preventing the enzymes from manufacturing necessary purine and pyrimidine nucleotides. This interference depletes the cell's availability of raw materials required for genetic synthesis, which is the initial molecular step leading to the drug's physiological effect.

Sustained Inhibition via Intracellular Activation

The drug requires an intracellular activation step called polyglutamation, which converts it into its highly potent form and traps the molecule inside the cell. This process ensures prolonged and robust inhibition of the target enzymes. This key mechanism of retention influences the duration and magnitude of the resulting physiological consequences on cell proliferation.

Inducing Cell Cycle Arrest and Cytotoxicity

The profound metabolic crisis caused by nucleotide deprivation prevents cells from completing DNA synthesis and repair. This failure triggers a cascade leading to cell cycle arrest and apoptosis (programmed cell death) in cells with high metabolic turnover. The resultant physiological effect is the cessation of proliferation, which primarily occurs in cell populations with the highest rates of metabolic turnover.

Dosage and Administration Information

Pempro (Pemetrexed disodium) is administered via intravenous (IV) infusion under a highly standardized, intermittent schedule. The usage is strictly structured around a 21-day cycle, with the 500 mg/m^2 dose being delivered on Day 1. The calculated dose must be administered as a slow infusion over a specific duration of 10 minutes.

A central component of the usage protocol is the mandatory pre-treatment regimen that must be adhered to before and throughout the course of therapy. This involves concurrent administration of oral folic acid (daily) and an intramuscular injection of Vitamin B12 every three cycles. In addition, oral corticosteroids (such as Dexamethasone 4 mg twice daily) are required for three consecutive days, starting the day before the Pemetrexed infusion.

The medicine is supplied as a lyophilized powder which must undergo reconstitution and dilution using 0.9% Sodium Chloride Injection before IV administration; the final solution must not contain calcium. Furthermore, administration is constrained by patient physiology: the medicine is not recommended for individuals whose creatinine clearance is below 45 mL/min. Treatment is continued in these 21-day cycles until defined clinical parameters are met.

Recent Clinical Evidence

Research evidence / Overview of studies for Pempro (Pemetrexed)

Research Evidence for Non-Squamous Non-Small Cell Lung Cancer (NSCLC)

Research examining Pempro in patients with non-squamous Non-Small Cell Lung Cancer (NSCLC) primarily involved large-scale Randomized Controlled Trials (RCTs). These studies were designed to compare Pemetrexed, either used alone or in combination with other chemotherapy drugs (such as a platinum agent), against other accepted treatments or observation. The trials were conducted during periods of increased symptom activity and focused on adults whose cancer had progressed or spread. Researchers studied outcomes related to Overall Survival (OS) and Progression-Free Survival (PFS), which monitor the time until death and the time until disease progression or death.

Studies report how symptoms evolved in the observed populations, and findings indicate patterns related to both OS and PFS when Pemetrexed was used in first-line combination and maintenance settings for the non-squamous cell type. Data for patients with a poor functional status (ECOG/WHO PS 2 or higher) remain insufficient. Most of the findings describe group patterns related to individuals who had a better functional status at the start of the study, and results apply only to the populations studied.


Research Evidence for Malignant Pleural Mesothelioma (MPM)

The evidence supporting the use of Pemetrexed as an initial treatment for Malignant Pleural Mesothelioma (MPM) is based primarily on a single, pivotal, large-scale Phase III trial. This comparative study monitored the use of Pemetrexed plus cisplatin against cisplatin alone in previously untreated patients. The pivotal trial was studied for outcomes related to Overall Survival (OS) and Progression-Free Survival (PFS), as well as Objective Tumor Response Rate. Findings described patterns in both the time to progression and the duration of survival for the combination regimen.

Evidence for all patient groups remains uncertain. The original trial focused predominantly on patients with a good functional status, and evidence is limited for those whose daily functioning or activity level was lower. The research base, particularly for this indication, is primarily based on the findings of one pivotal trial. Long-term outcomes are not well characterized, meaning there is limited information for long-term outcomes related to daily functioning and patient experience over many years.

Key Studies & References Label: PEMETREXED injection, solution, concentrate - Full Prescribing Information and Indications (Regulatory Document)

Frequently Asked Questions (FAQ)

Common questions about Pempro (FAQ)

Q: How quickly does Pempro usually start working?

Studies and official information indicate that the medicine's effects are measured over the course of treatment cycles. Regulatory agencies monitor outcomes like Progression-Free Survival (PFS), which measures the time until the cancer progresses, and Overall Survival (OS). These results are evaluated across multiple 21-day treatment cycles, rather than a specific daily onset time.


Q: What is the expected timeline for seeing results from Pempro?

Clinical trials describe patient outcomes by measuring how long it takes for the cancer to show a tumor response or for the disease to progress. These measured results are typically evaluated at scheduled intervals across several 21-day cycles of therapy. The timeline for seeing results is therefore defined by the period over which monitoring and evaluations take place.


Q: How long do most people stay on Pempro treatment?

According to the official product information, Pempro is administered in 21-day cycles. Regulatory documents state the continuation criteria: treatment cycles proceed unless disease progression or unacceptable toxicity is observed.


Q: Is Pempro generally taken long-term or short-term?

The regimen is structured to continue in 21-day cycles, based on the patient's clinical status, rather than a fixed short-term duration. This structure means the duration of therapy is determined by clinical factors.


Q: Is Pempro safe for people who have kidney problems?

Regulatory documents advise against using Pempro when kidney function is severely impaired, which is defined as having a creatinine clearance below 45 mL/min. This restriction is due to the potential risk of renal (kidney) toxicity. Official administration protocols indicate that kidney function must be monitored periodically during therapy.


Q: Can Pempro be used by elderly patients?

Official documents note that patients 65 years of age or older have not been shown to be at an increased risk of adverse reactions compared to younger patients in clinical studies. Therefore, no specific dose adjustments are typically recommended based on age alone.


Q: Does taking Pempro require regular blood tests?

Yes, official regulatory information specifies that patients should be monitored before each dose with a complete blood count. Official prescribing information requires monitoring of blood cell counts, including white blood cells and platelets, before each dose.


Q: Can Pempro be taken with pain relievers like ibuprofen?

The use of certain pain relievers, specifically Non-Steroidal Anti-Inflammatory Drugs (NSAIDs) such as ibuprofen, is subject to specific timing constraints described in official labeling. Official prescribing information states that avoidance is necessary within a set time window surrounding the infusion days, particularly for patients with mild-to-moderate kidney impairment.


Q: What should I do if I experience a very rare side effect listed for Pempro?

Official patient labeling provides criteria for when a healthcare provider should be contacted, which includes symptoms such as fever, signs of infection, bleeding, or symptoms of anemia. The official guidelines for managing severe reactions, such as bullous skin toxicity, may mandate permanent discontinuation of the medicine.


Q: Why is the dosage of Pempro different for certain age groups?

Official administration protocols define the dosage based on the patient’s Body Surface Area (BSA) in mg/m^2. This method is used to tailor the amount of medicine based on the individual's size, which accounts for size differences that often vary between age groups.


Q: Is Pempro an antibiotic or an antiviral?

Official documents classify Pempro as an antineoplastic agent, which is a type of chemotherapy. It belongs to the subclass of folate antimetabolites. It is not classified as an antibiotic, which treats bacterial infections, or an antiviral medicine.


Q: Can taking Pempro make you feel tired or drowsy?

Fatigue (a feeling of being extremely tired) is documented in official labeling as a very common adverse reaction. Dizziness and other neurological symptoms, which may contribute to a feeling of not being fully alert, have also been reported.


Q: Can Pempro affect my ability to drive or operate machinery?

Official documents note that the medicine can cause certain side effects, such as fatigue and dizziness. Official information notes that due to these possible effects, a patient’s ability to drive or safely operate machinery may be affected.


Q: Is it normal to feel a mild headache after starting Pempro?

Headache has been reported in clinical experience, though it is not listed as a common stand-alone side effect. Official safety information sometimes associates headaches with other documented symptoms, such as an infection or allergic reactions.


Q: What if I take supplements—do they interact with Pempro?

Official labeling mandates the co-administration of the supplements folic acid and Vitamin B12 to help reduce potential toxicity. However, patients are generally instructed to inform their healthcare provider about all medicines, including prescription drugs, nonprescription drugs, and vitamins, as other interactions can occur.


Q: Is there a generic version of Pempro available?

Yes, the active ingredient, Pemetrexed, is available under multiple brand names, including generic equivalents. These are generally listed in the regulatory databases of health authorities.


Q: Are there different strengths of Pempro?

Pempro is supplied in different single-dose vial strengths, such as 100 mg, 500 mg, and 1,000 mg vials. These different concentrations are used by healthcare professionals when preparing the final solution for the patient’s infusion.


Q: Can Pempro be crushed or split if it is a tablet?

Pempro is supplied as a sterile powder or a liquid solution that is administered directly into the vein via intravenous infusion by a healthcare professional. It is not an oral tablet or capsule and cannot be crushed or split.


Q: Does Pempro cause weight changes?

The official safety profile lists anorexia (loss of appetite) as a very common adverse reaction. Separately, official reports indicate that weight gain or swelling may be noted as a possible symptom related to severe renal (kidney) toxicity.


Q: What is the risk of an allergic reaction to Pempro?

Official labeling lists a known history of severe hypersensitivity (allergic reaction) to the medicine as a contraindication, meaning the drug should not be used. The safety profile also documents serious adverse reactions, including signs like rash, itching, and hives.


Q: Does Pempro affect blood pressure?

Official regulatory documents state that an increase in blood pressure (hypertension) may occur as a reported side effect. This effect is noted in the official safety profile, particularly as something that elderly patients are more likely to experience.


Q: Has Pempro been tested on children?

Safety and effectiveness of Pempro have not been established in the pediatric population, which includes patients under 18 years of age. The medicine has not been studied in children.


Q: Is it necessary to take Pempro at the exact same time every day?

Pempro is administered as an intravenous infusion on Day 1 of a 21-day cycle under clinical supervision. It is not a daily oral medication, and therefore does not follow the requirement of being taken at the same time each day.


Q: Is Pempro considered a strong medicine?

Pempro is officially classified as an antineoplastic agent, which is a type of medicine used in chemotherapy. Its mechanism involves interfering with the replication of rapidly dividing cells for the management of cancer.


Q: Is there a maximum time frame for using Pempro?

Official prescribing information states that Pempro treatment is continued in 21-day cycles until the cancer shows disease progression or the patient experiences unacceptable toxicity. The duration is determined by the patient's clinical status, not a fixed time limit.


Q: Does Pempro treat the symptoms or the underlying cause?

The medicine’s purpose is to disrupt the folate-dependent metabolic processes that are essential for cancer cell replication. By affecting the underlying cellular multiplication, it is used to manage the progression of the disease.

How should Pempro be stored and disposed of?

The storage and disposal of Pempro (Pemetrexed) are strictly regulated due to its classification as a cytotoxic agent.


Storage Conditions

Requirement Details
Unreconstituted Powder Store in the original container at controlled room temperature (20 C to 25 C) to protect from light. Do not refrigerate or freeze the powder.
Prepared Solution Use within 24 hours of reconstitution, even when stored under refrigeration (2 C to 8 C).

Disposal Instructions

Unused product and all associated waste must be disposed of according to local and national regulations for cytotoxic medicinal products. This requirement mandates that Pempro must not be placed in household trash or poured down the drain. Like all medicines, it must be stored out of the sight and reach of children.

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

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