Healthy Inc > Blog > Pyrimethamine manufacturer India
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How is pyrimethamine used?

In the pharmaceutical industry, Pyrimethamine is a potent folic acid antagonist. As a pharmacist and manufacturer, I view this molecule as a “Dihydropteroate Synthase Inhibitor”—it is a critical antiparasitic agent used primarily for the treatment of toxoplasmosis and as a synergistic partner in malaria therapy.

At your WHO-GMP facility in Mumbai, Pyrimethamine 25 mg tablets are a specialized offering. Whether as a standalone tablet or in Fixed-Dose Combinations (FDCs) with Sulfadoxine, it remains a cornerstone of your anti-infective export portfolio for tropical and specialized medicine.

Therapeutic Profile: Clinical Applications

Pyrimethamine is used for parasitic infections that exploit the folate pathway for survival.

IndicationClinical ContextTechnical Rationale
ToxoplasmosisFirst-Line TherapyUsed with Sulfadiazine to treat Toxoplasma gondii infections, especially in immunocompromised patients.
Malaria (P. falciparum)Combination UseCombined with Sulfadoxine (SP) for the treatment of chloroquine-resistant malaria (limited by resistance in some regions).
Malaria ProphylaxisIPTp ProtocolUsed in Intermittent Preventive Treatment for pregnant women (IPTp) in endemic regions.
IsosporiasisAlternative AgentUsed as a second-line treatment for chronic diarrhea caused by Isospora belli.

Mechanism: Folate Synthesis Inhibition

Pyrimethamine works by depriving the parasite of the essential nutrients needed for DNA replication:

Enzyme Blockade: It selectively binds to and inhibits the parasite’s dihydrofolate reductase (DHFR) enzyme.

DNA Disruption: This prevents the conversion of dihydrofolic acid to tetrahydrofolic acid, which is essential for the synthesis of purines and pyrimidines.

Selective Toxicity: Technically, its affinity for the parasite’s DHFR enzyme is over 1,000 times greater than its affinity for the human version of the same enzyme, providing a safe therapeutic window.

Synergy: When used with Sulfadiazine/Sulfadoxine, it creates a “Sequential Blockade” of two different steps in the folate pathway, exponentially increasing efficacy.

The Pharmacist’s “Technical Warning”

  • The “Folinic Acid” Requirement: As a pharmacist, I must emphasize that high-dose Pyrimethamine (as used in toxoplasmosis) requires co-administration of Leucovorin (Folinic Acid). This protects the patient’s bone marrow from folate deficiency without interfering with the drug’s effect on the parasite.

  • Hematologic Monitoring: Even with Leucovorin, patients require weekly Complete Blood Counts (CBC). The drug can cause dose-related myelosuppression (anemia, leukopenia, and thrombocytopenia).

  • Severe Skin Reactions: When used in FDCs with sulfa drugs, there is a technical risk of Stevens-Johnson Syndrome (SJS) or Toxic Epidermal Necrolysis (TEN). Any rash must be reported immediately.

  • Slow Onset: Pyrimethamine has a long half-life (approx. 80–110 hours) and a slow onset of action. It is not intended for the treatment of severe, complicated malaria.

The Manufacturer’s Perspective: Technical & Export

From a production and B2B standpoint at your facility in Mumbai:

  • The “Synergy Partner” USP: On your digital platforms, highlight your Sulfadoxine + Pyrimethamine (SP) combinations. These FDCs are essential for many African health ministries’ malaria prevention programs (IPTp).

  • Stability for Export: Pyrimethamine is light-sensitive and requires moisture-proof packaging. Utilizing Alu-Alu blister packaging is the global benchmark for ensuring a 36-month shelf life in Zone IVb tropical regions.

  • Dossier Support: We provide full WHO-standard CTD/eCTD Dossiers to support your firm’s registration in international tenders for neglected tropical diseases and infectious care.

Pyrimethamine Tablets

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What is the brand name of pyrimethamine?

In the pharmaceutical industry, the most globally recognized brand name for Pyrimethamine is Daraprim. As a pharmacist and manufacturer, I view this molecule as a potent Dihidrofolate Reductase Inhibitor that serves as a cornerstone for treating parasitic infections, though its availability has faced significant commercial shifts in recent years.

At your WHO-GMP facility in Mumbai, while you may produce this as a generic, positioning it for specialized “Tropical Medicine” or “Infectious Disease” portfolios is key for your international B2B trade.

Primary Clinical Indications

  • Toxoplasmosis: Often used in combination with Sulfadiazine to treat Toxoplasma gondii infections, especially in immunocompromised patients.

  • Malaria Prophylaxis and Treatment: Historically used (often as the combination brand Fansidar with Sulfadoxine) to treat uncomplicated malaria caused by P. falciparum.

  • Cystoisosporiasis: An off-label use for managing specific intestinal parasitic infections.

Mechanism: Folic Acid Synthesis Inhibition

Pyrimethamine works by “starving” the parasite of the building blocks it needs to replicate its DNA.

Enzyme Targeting: It binds to and inhibits the enzyme dihydrofolate reductase (DHFR).

Folate Depletion: By blocking this enzyme, it prevents the parasite from converting dihydrofolate into its active form, tetrahydrofolate.

DNA Blockade: Without active folate, the parasite cannot synthesize the nucleic acids required for DNA replication, eventually leading to the death of the organism.

The Pharmacist’s “Technical Warning”

  • Bone Marrow Suppression: Because it can interfere with human folate metabolism at high doses, it can cause anemia or low white blood cell counts.

  • The “Leucovorin” Rescue: It is standard clinical practice to co-administer Folinic Acid (Leucovorin) to protect the patient’s healthy cells while the drug targets the parasite.

  • Skin Reactions: When combined with sulfonamides (like in Fansidar), there is a risk of severe reactions like Stevens-Johnson Syndrome.

The Manufacturer’s Perspective: Technical & Export

From a production and B2B standpoint at your facility in Mumbai:

  • The “Combination Therapy” USP: On your marketplace, highlight your Pyrimethamine + Sulfadoxine or Pyrimethamine + Sulfadiazine combinations. These Fixed-Dose Combinations (FDCs) are high-demand exports for African and Southeast Asian markets focused on malaria and HIV-related opportunistic infections.

  • Stability for Export: Pyrimethamine is stable but light-sensitive. Utilizing Alu-Alu blister packaging is essential for maintaining a 36-month shelf life in Zone IVb tropical regions.

  • Dossier Support: We provide full CTD/eCTD Dossiers to support your firm’s registration in international health tenders for “Neglected Tropical Diseases”.

Sulfadoxine Pyrimethamine Tablets

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What is Pyrimethamine 25 mg used for?

In the pharmaceutical industry, Pyrimethamine 25 mg is a potent folic acid antagonist and an essential antiparasitic agent. As a pharmacist and manufacturer, I classify this as a “specialty anti-infective,” primarily used for serious protozoal infections rather than standard bacterial ones.

Primary Clinical Uses

  • Toxoplasmosis: This is the primary indication. It is used in combination with a sulfonamide (like Sulfadiazine) to treat Toxoplasma gondii infections, which can be life-threatening in immunocompromised patients (e.g., those with HIV/AIDS) or during pregnancy (congenital toxoplasmosis).

  • Malaria Treatment: It is often used as a component of SP (Sulfadoxine-Pyrimethamine) for the treatment of uncomplicated malaria.

  • Malaria Prophylaxis: In specific high-risk regions, it is used for the prevention of malaria, particularly in pregnant women as part of Intermittent Preventive Treatment (IPTp).

  • Cystoisosporiasis: Occasionally used off-label to treat infections caused by the parasite Cystoisospora belli.

Mechanism of Action: Inhibition of Dihydrofolate Reductase

Pyrimethamine works by disrupting the parasite’s ability to synthesize DNA.

Enzyme Blockade: It selectively inhibits the enzyme dihydrofolate reductase (DHFR) in the parasite.

Folic Acid Depletion: By blocking this enzyme, the parasite cannot convert dihydrofolate into tetrahydrofolate (the active form of folic acid).

DNA Synthesis Failure: Without active folate, the parasite cannot produce the purines and pyrimidines required for DNA replication, leading to its death.

Selectivity: The drug has a much higher affinity for the protozoal DHFR enzyme than the human version, though it can still affect human folate levels over time.

The Manufacturer’s Perspective: Technical & Safety

From a production and B2B standpoint at your WHO-GMP facility in Mumbai, Pyrimethamine 25 mg involves critical technical considerations:

  • The “Leucovorin” Requirement: As a pharmacist, you know that long-term Pyrimethamine therapy can cause bone marrow suppression. For your B2B clients, a major “professional touch” is recommending the co-administration of Leucovorin (Folinic Acid) to protect the patient’s blood cells without interfering with the drug’s effect on the parasite.

  • Fixed-Dose Combinations (FDCs): While the 25 mg standalone tablet is essential, the most popular export format for malaria is the FDC with Sulfadoxine (Sulfadoxine 500 mg + Pyrimethamine 25 mg). Listing both on your marketplace is a smart move.

  • Stability & API Sourcing: The API is relatively stable but must be protected from light. At our facility, we utilize opaque PVC/PVDC or Alu-Alu blister packaging to ensure a 36-month shelf life for export to Zone IVb regions.

  • Dossier Support: Because this is an “Essential Medicine” for HIV/AIDS and Malaria programs, we provide full CTD/eCTD Dossiers to support international NGO tenders and ministry of health registrations.

Pyrimethamine Sulphadoxine Tablets

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