Description

Pemetrexed 500mg Injection (Pemegem) – Uses, Side Effects, Dosage & Price in Pakistan

Pemetrexed 500mg Injection (Pemegem) is an anticancer medicine containing pemetrexed, a folate-antagonist chemotherapy drug. It is mainly used as part of treatment plans for certain types of non-small cell lung cancer (NSCLC) and malignant pleural mesothelioma. Depending on the cancer type and treatment plan, pemetrexed may be given with other medicines such as cisplatin, carboplatin, or pembrolizumab, or may be continued alone as maintenance treatment.

For patients and families in Pakistan looking for information about Pemetrexed 500mg Injection (Pemegem), it is important to understand that this is a prescription chemotherapy medicine. Its dose, combination with other medicines, and treatment duration must be determined by an oncologist. Impo Medic provides medicine-related information to help patients better understand their prescribed treatment and availability.

Pemetrexed 500mg Injection (Pemegem) Used For

Pemetrexed is approved for specific forms of non-squamous non-small cell lung cancer and malignant pleural mesothelioma. It is not indicated for squamous-cell NSCLC according to the current prescribing information.

Non-Squamous Non-Small Cell Lung Cancer

Pemetrexed may be used in adults with locally advanced or metastatic non-squamous NSCLC. Depending on the treatment setting, it may be prescribed:

• With cisplatin as initial treatment for locally advanced or metastatic disease.
• With pembrolizumab and platinum chemotherapy for initial treatment of metastatic non-squamous NSCLC in patients without EGFR or ALK genomic tumor aberrations.
• Alone as maintenance therapy after four cycles of platinum-based first-line chemotherapy when the disease has not progressed.
• Alone for recurrent or metastatic non-squamous NSCLC after previous chemotherapy.

The exact combination depends on the patient’s cancer characteristics, previous treatment, kidney function, and the oncologist’s treatment plan.

Malignant Pleural Mesothelioma

Pemetrexed is also used with cisplatin for the initial treatment of malignant pleural mesothelioma when the disease is unresectable or the patient is not a candidate for curative surgery.

How Pemetrexed 500mg Injection Works

Pemetrexed belongs to a group of medicines known as antifolates or folate analog metabolic inhibitors. It interferes with enzymes involved in folate-dependent processes that cancer cells need to make DNA and RNA.

By interfering with these pathways, pemetrexed can slow or stop the growth of rapidly dividing cancer cells. NCI describes pemetrexed as a multitargeted antifolate that inhibits enzymes involved in DNA synthesis.

Because healthy cells can also be affected by chemotherapy, treatment may cause side effects such as low blood-cell counts, fatigue, nausea, and loss of appetite.

Pemetrexed 500mg Injection Dosage

The dose of pemetrexed is generally calculated according to body surface area rather than simply giving the entire 500mg vial to every patient.

For many approved adult indications, the recommended dose is 500 mg/m², administered intravenously over approximately 10 minutes on Day 1 of a 21-day treatment cycle. The exact schedule depends on whether pemetrexed is being used with cisplatin, pembrolizumab and platinum chemotherapy, or as a single-agent treatment.

The current label recommends pemetrexed only when the patient’s calculated creatinine clearance is 45 mL/min or greater. Kidney function should be assessed before treatment cycles.

Vitamin Supplements With Pemetrexed

Vitamin supplementation is an important part of pemetrexed treatment because it helps reduce certain treatment-related toxicities.

The prescribing information recommends:

• Folic acid 400–1000 mcg orally once daily, beginning 7 days before the first pemetrexed dose and continuing until 21 days after the final dose.
• Vitamin B12 1 mg by intramuscular injection, given about 1 week before the first pemetrexed dose and then every 3 cycles.
• Dexamethasone 4mg twice daily for three consecutive days, beginning the day before each pemetrexed administration, to help reduce certain skin reactions.

Patients should not change these supplements or their chemotherapy schedule without medical advice.

How Pemetrexed 500mg Injection Is Given

Pemetrexed is administered intravenously by qualified healthcare professionals, usually in a hospital, oncology clinic, or specialized infusion facility.

The medicine is prepared according to professional handling requirements and given as an IV infusion over approximately 10 minutes. A healthcare professional calculates the patient’s required dose and checks laboratory results before treatment.

Pemetrexed is available in different vial strengths. Current prescribing information includes a 500mg/20mL presentation containing 25mg/mL pemetrexed.

Pemetrexed 500mg Injection Side Effects

Like other chemotherapy medicines, Pemetrexed 500mg Injection (Pemegem) can cause side effects. Some are mild, while others can require urgent medical attention.

Common side effects may include:

• Fatigue or weakness
• Nausea
• Loss of appetite
• Vomiting
• Constipation
• Diarrhea
• Rash
• Sore mouth or throat
• Low red blood-cell count
• Low white blood-cell count
• Low platelet count
• Cough
• Shortness of breath
• Fever

The exact side effects depend on whether pemetrexed is given alone or together with other anticancer medicines.

Serious Side Effects

Pemetrexed can cause serious complications, including:

• Severe bone marrow suppression
• Serious infections due to low white blood-cell counts
• Severe kidney problems
• Serious blistering or exfoliative skin reactions
• Interstitial pneumonitis
• Radiation recall reactions
• Severe gastrointestinal or other treatment-related toxicity
• Fetal harm during pregnancy

Patients should promptly contact their oncology team if they develop high fever, unusual bleeding, severe weakness, difficulty breathing, significant reduction in urine, or severe skin reactions.

Pemetrexed Precautions and Warnings

Before starting Pemetrexed 500mg Injection (Pemegem), the doctor should know about the patient’s medical history, especially kidney problems, previous severe reactions to pemetrexed, current medicines, pregnancy status, and previous radiation treatment.

Kidney Function

Pemetrexed can cause significant renal toxicity. Kidney function should be assessed before each treatment cycle, and the medicine should not be administered when creatinine clearance is below 45 mL/min according to the current label.

Blood Counts

Pemetrexed can suppress bone marrow and reduce white blood cells, red blood cells, and platelets. Blood tests are therefore required during treatment. The prescribing information specifies minimum blood-count requirements before administration.

Pregnancy

Pemetrexed can cause fetal harm. Women who can become pregnant should discuss effective contraception with their healthcare provider before and during treatment. Men and women should receive appropriate reproductive counseling from their oncology team.

Breastfeeding

The current prescribing information advises patients not to breastfeed during treatment with pemetrexed.

Pemetrexed Drug Interactions

Some medicines can increase the risk of pemetrexed-related toxicity, particularly in patients with reduced kidney function.

Ibuprofen and certain other medicines that affect renal drug transport may require special consideration. The current label advises avoiding ibuprofen around the time of pemetrexed administration and avoiding other OAT3 inhibitors when possible.

Patients should provide their oncologist with a complete list of prescription medicines, over-the-counter products, vitamins, and supplements before receiving treatment.

Who Should Not Receive Pemetrexed?

Pemetrexed is contraindicated in patients with a history of severe hypersensitivity reaction to pemetrexed.

It also requires careful assessment in patients with significant kidney impairment, abnormal blood counts, previous serious chemotherapy reactions, or other conditions that may increase treatment risks.

Pemetrexed 500mg Injection Price in Pakistan

The Pemetrexed 500mg Injection (Pemegem) price in Pakistan can vary depending on the manufacturer, supplier, availability, hospital or pharmacy, and import-related factors. Oncology medicines may also have different prices at different times because availability can change.

For the latest availability and current pricing information, patients can check with Impo Medic. The product should be purchased only from a reliable medicine supplier and used under the supervision of an oncologist.

How to Buy Pemetrexed 500mg Injection in Pakistan

Patients looking to buy Pemetrexed 500mg Injection (Pemegem) in Pakistan should first confirm the exact product, strength, manufacturer, and prescription requirements with their healthcare provider.

Impo Medic can be considered as a source for checking the availability of prescribed oncology medicines in Pakistan. Before purchasing, verify the packaging, expiry date, batch information, and storage requirements. Pemetrexed is a chemotherapy medicine and should not be self-administered.

FAQs About Pemetrexed 500mg Injection (Pemegem)

What is Pemetrexed 500mg Injection (Pemegem) used for?

Pemetrexed is mainly used for certain types of non-squamous non-small cell lung cancer and malignant pleural mesothelioma. Depending on the cancer setting, it may be used alone or with other chemotherapy or immunotherapy medicines.

Is Pemetrexed 500mg a chemotherapy medicine?

Yes. Pemetrexed is an antifolate chemotherapy medicine that interferes with folate-dependent processes required for DNA synthesis in rapidly dividing cells.

How often is Pemetrexed given?

For many approved adult treatment settings, pemetrexed is given on Day 1 of a 21-day cycle. The standard dose is commonly 500 mg/m², but the treatment schedule and duration depend on the specific cancer and combination therapy.

Why are folic acid and vitamin B12 given with pemetrexed?

Folic acid and vitamin B12 supplementation helps reduce the severity of certain blood-related and gastrointestinal toxicities associated with pemetrexed. They are an important part of the recommended treatment preparation.

Can Pemetrexed be used for all types of lung cancer?

No. Pemetrexed is specifically indicated for non-squamous NSCLC in the approved settings. The current prescribing information states that it is not indicated for squamous-cell NSCLC.

Can Pemetrexed affect the kidneys?

Yes. Pemetrexed can cause serious renal toxicity. Kidney function is checked before treatment, and the medicine should not be administered when creatinine clearance is below 45 mL/min according to the current prescribing information.

Is Pemetrexed safe during pregnancy?

Pemetrexed can cause fetal harm, so pregnancy should be discussed with the treating oncologist before therapy. Appropriate contraception and reproductive counseling may be required.

Where can I check Pemetrexed 500mg Injection availability in Pakistan?

Patients can check current availability of prescribed oncology medicines through reliable suppliers such as Impo Medic. The medicine should be obtained according to a valid prescription and handled by qualified healthcare professionals.