Teriflunomide

What is Teriflunomide?

Teriflunomide is an oral prescription medication primarily used to treat relapsing forms of multiple sclerosis (MS). It is an immunomodulatory agent that works by reducing the inflammation and nerve damage associated with the disease. Marketed under the brand name Aubagio, Teriflunomide is an active metabolite of leflunomide, a drug used for rheumatoid arthritis, sharing a similar mechanism of action but specifically approved for MS.

Multiple sclerosis is a chronic, autoimmune disease that affects the brain and spinal cord, leading to a range of symptoms including fatigue, numbness, vision problems, and difficulty with coordination. Relapsing forms of MS, such as relapsing-remitting MS (RRMS) and active secondary progressive MS (SPMS), are characterized by periods of new or worsening symptoms (relapses) followed by periods of recovery.

As an oral medication, Teriflunomide offers a convenient treatment option for many patients compared to injectable therapies. Its introduction has provided a significant advancement in the management of MS, helping to reduce the frequency of relapses and slow the progression of disability.

How Does it Work?

Teriflunomide's therapeutic effects in multiple sclerosis stem from its unique mechanism of action. It is a selective and reversible inhibitor of the mitochondrial enzyme dihydroorotate dehydrogenase (DHODH). This enzyme plays a crucial role in the de novo pyrimidine synthesis pathway, which is essential for the proliferation of rapidly dividing cells, particularly activated T and B lymphocytes.

By inhibiting DHODH, Teriflunomide effectively reduces the number of activated lymphocytes in the central nervous system. These immune cells are key contributors to the inflammatory processes and demyelination that characterize MS. Unlike broad immunosuppressants, Teriflunomide does not cause significant depletion of resting lymphocytes, thereby aiming to minimize widespread immunosuppression.

The drug's immunomodulatory properties help to dampen the autoimmune attack on myelin, the protective sheath around nerve fibers, and reduce the inflammatory lesions in the brain and spinal cord. This leads to a decrease in the number of MS relapses and can slow the accumulation of physical disability over time. Its selective action on activated immune cells is what makes it a targeted therapy for MS.

Medical Uses

Teriflunomide is approved for the treatment of adult patients with relapsing forms of multiple sclerosis (MS). This includes:

• Relapsing-Remitting Multiple Sclerosis (RRMS): The most common form of MS, characterized by clearly defined attacks of worsening neurologic function (relapses) followed by partial or complete recovery.
• Active Secondary Progressive Multiple Sclerosis (SPMS): A stage of MS that follows an initial relapsing-remitting course, where the disease progresses steadily, with or without occasional relapses, minor remissions, or plateaus.
• Clinically Isolated Syndrome (CIS): An initial episode of neurologic symptoms caused by inflammation and demyelination in the central nervous system, if it is considered to be at high risk of developing into definite MS.

By reducing the frequency of relapses and delaying the progression of physical disability, Teriflunomide helps improve the long-term prognosis and quality of life for individuals living with these forms of MS. Treatment decisions should always be made in consultation with a neurologist experienced in MS management.

Dosage

Teriflunomide is administered orally as a tablet, typically once daily. It is available in two strengths: 7 mg and 14 mg. The specific dosage prescribed will depend on the individual patient's condition, response to treatment, and physician's assessment.

The recommended starting and maintenance dose for most adults with relapsing forms of MS is 14 mg once daily. However, some patients may be prescribed a lower dose of 7 mg once daily, especially if they experience side effects at the higher dose.

Teriflunomide tablets can be taken with or without food. It is important to take the medication at approximately the same time each day to maintain consistent drug levels in the body. If a dose is missed, it should be taken as soon as remembered, unless it is almost time for the next dose, in which case the missed dose should be skipped.

Adherence to the prescribed dosage and regular monitoring by a healthcare professional are crucial for optimizing treatment outcomes and managing potential side effects.

Side Effects

Like all medications, Teriflunomide can cause side effects, although not everyone experiences them. It's important for patients to discuss potential side effects with their healthcare provider.

Common Side Effects:

• Diarrhea
• Nausea
• Hair thinning or loss (alopecia)
• Headache
• Elevated liver enzymes (transaminase elevations)
• Paraesthesia (tingling or numbness)
• Joint pain (arthralgia)
• High blood pressure (hypertension)

Serious Side Effects:

While less common, some side effects can be serious and require immediate medical attention:

• Liver Damage: Teriflunomide can cause severe liver injury, including liver failure. Regular liver function tests are essential before and during treatment.
• Peripheral Neuropathy: Nerve damage in the extremities, characterized by numbness, tingling, or weakness.
• Serious Infections: Due to its immunomodulatory effects, Teriflunomide can increase the risk of serious infections. Patients should be monitored for signs of infection.
• Bone Marrow Effects: Can lead to decreased white blood cell counts, increasing infection risk.
• Hypertension: May cause or worsen high blood pressure.
• Birth Defects: Teriflunomide is highly teratogenic (causes birth defects) and is absolutely contraindicated in pregnancy. Women of childbearing potential must use effective contraception during and for an extended period after treatment. A rapid elimination procedure may be required if pregnancy occurs or is planned.
• Severe Skin Reactions: Rare but serious skin reactions, such as Stevens-Johnson syndrome, have been reported.

Patients should report any unusual or severe symptoms to their doctor promptly.

Drug Interactions

Teriflunomide can interact with other medications, potentially altering their effects or increasing the risk of side effects. It is crucial to inform your doctor about all prescription, over-the-counter, and herbal supplements you are taking.

Key Drug Interactions:

• Warfarin: Teriflunomide may decrease the anticoagulant effect of warfarin. Close monitoring of INR (International Normalized Ratio) is recommended if these drugs are co-administered.
• Live Vaccines: Live attenuated vaccines should be avoided during Teriflunomide treatment and for a period after, due to the increased risk of infection in immunocompromised patients.
• Rifampin and other strong CYP1A2 inducers: These drugs can significantly decrease Teriflunomide plasma concentrations, potentially reducing its effectiveness.
• Cholestyramine and Activated Charcoal: These agents can accelerate the elimination of Teriflunomide from the body. They are often used in a rapid elimination procedure if necessary (e.g., in case of pregnancy or severe adverse reactions).
• Drugs metabolized by CYP1A2 (e.g., Tizanidine, Duloxetine): Teriflunomide is a moderate inhibitor of CYP1A2, which can increase the plasma concentrations of drugs metabolized by this enzyme. Dose adjustments for co-administered drugs may be necessary.
• OATP1B1/1B3 Substrates (e.g., Statins, Repaglinide): Teriflunomide is an inhibitor of these transporters, potentially increasing exposure to their substrates.
• BCRP and MATE Substrates (e.g., Methotrexate, Rosuvastatin): Teriflunomide can increase exposure to drugs that are substrates of these transporters.

Always consult your healthcare provider or pharmacist for a comprehensive list of potential drug interactions.

FAQ

Q: Is Teriflunomide a chemotherapy drug?

A: No, Teriflunomide is not a chemotherapy drug in the traditional sense. While it affects rapidly dividing cells, its mechanism of action is more targeted as an immunomodulator, specifically inhibiting pyrimidine synthesis in activated immune cells involved in MS, rather than broadly targeting all rapidly dividing cells like conventional chemotherapy.

Q: How long does it take for Teriflunomide to start working?

A: The therapeutic effects of Teriflunomide may not be immediately noticeable. Clinical studies suggest that benefits, such as a reduction in relapse rates, can be observed within a few months of starting treatment, with full effects often taking longer to manifest. Consistent daily dosing is key to achieving optimal results.

Q: Can men and women get pregnant while taking Teriflunomide?

A: Teriflunomide is highly teratogenic, meaning it can cause severe birth defects. Therefore, it is absolutely contraindicated during pregnancy. Women of childbearing potential must use effective contraception during treatment and for a period after, as determined by their doctor. Men taking Teriflunomide should also use effective contraception if their partner is pregnant or of childbearing potential, due to the risk of drug transfer. A rapid elimination procedure is recommended for both men and women if pregnancy is desired or occurs while on or after treatment.

Q: What is the difference between Teriflunomide and Leflunomide?

A: Teriflunomide is the active metabolite of leflunomide. Both drugs inhibit dihydroorotate dehydrogenase, but leflunomide is primarily used for rheumatoid arthritis, while Teriflunomide is specifically approved and formulated for the treatment of multiple sclerosis.

Products containing Teriflunomide are available through trusted online pharmacies. You can browse Teriflunomide-based medications at ShipperVIP or Medicenter.

Summary

Teriflunomide is an important oral immunomodulatory treatment for relapsing forms of multiple sclerosis, including RRMS and active SPMS. It works by selectively inhibiting dihydroorotate dehydrogenase, thereby reducing the proliferation of activated T and B lymphocytes that contribute to MS pathology. This action helps to decrease relapse frequency and slow disability progression.

While offering convenience as an oral therapy, it's crucial for patients to be aware of potential side effects, particularly serious concerns like liver damage and its absolute contraindication in pregnancy due to teratogenicity. Regular monitoring by a healthcare professional is essential throughout treatment to manage side effects and ensure optimal outcomes.

Patients considering or undergoing Teriflunomide treatment should maintain open communication with their doctors regarding dosage, potential drug interactions, and any emerging health concerns to ensure safe and effective management of their MS.