توفاسیتینیب

Introduction: What is Tofacitinib?

Tofacitinib (lowercase in body) is a medication primarily used to treat autoimmune diseases, particularly rheumatoid arthritis, psoriatic arthritis, ulcerative colitis, and polyarticular course juvenile idiopathic arthritis (pcJIA) in patients 2 years and older. It belongs to a class of drugs known as Janus kinase (JAK) inhibitors, which work by interfering with the activity of certain enzymes involved in the inflammatory process. By doing so, Tofacitinib helps reduce inflammation, pain, and other symptoms associated with these chronic conditions.

Uses of Tofacitinib

Tofacitinib is approved for several medical uses, including:

• روماتیسم مفصلی: این دارو در بزرگسالانی استفاده می‌شود که پاسخ ناکافی به یک یا چند داروی ضد روماتیسمی تعدیل‌کننده بیماری (DMARDs) داشته‌اند.
• آرتریت پسوریاتیک: Tofacitinib is indicated for adults with active psoriatic arthritis who have not responded well to other treatments.
• کولیت زخمی: It is also approved for the treatment of moderately to severely active ulcerative colitis in adults who have not responded to other therapies.

چگونه کار می کند؟

Tofacitinib works by selectively inhibiting JAK1 and JAK3 enzymes that play a crucial role in the JAK-STAT signaling pathway of various immune cells. When these enzymes are blocked, the inflammatory response is reduced, leading to decreased symptoms such as pain, swelling, and fatigue. In simpler terms, tofacitinib helps modulate the immune system, which can become overactive in autoimmune diseases.

مقدار و نحوه مصرف

Tofacitinib is typically administered in tablet form. The standard dosages are as follows:

• روماتیسم مفصلی: 5 mg orally twice daily (BID) is standard; increase to 10 mg BID only if inadequate response and as per safety data.
• آرتریت پسوریاتیک: The recommended dose is also 5 mg orally twice daily (BID), with a possible increase to 10 mg BID only if inadequate response and per safety data.
• Polyarticular Course Juvenile Idiopathic Arthritis (pcJIA): Weight-based oral solution dosing (e.g., 3.2 mg BID for 10-<20 kg).
• کولیت زخمی: The initial (induction) dose is 10 mg orally twice daily (BID) for 8 weeks, followed by a maintenance dose of 5 mg BID (or 10 mg BID if inadequate response). Xeljanz XR equivalent is 11 mg once daily.

Side Effects of Tofacitinib

Like all medications, Tofacitinib can cause side effects.

عوارض جانبی شایع عبارتند از:

• سردرد
• تهوع
• اسهال
• عفونتهای تنفسی فوقانی
• Increased transaminases (ALT/AST)

عوارض جانبی جدی ممکن است شامل موارد زیر باشد:

• Increased risk of infections (e.g., tuberculosis, bacterial, viral, or fungal infections)
• لخته شدن خون
• مشکلات کبدی
• Anemia, Lymphopenia, Neutropenia
• Malignancies (e.g., lymphoma, skin cancer)
• رویدادهای نامطلوب قلبی عروقی عمده (MACE)

بیماران باید هرگونه علائم غیرمعمول را فوراً به پزشک خود گزارش دهند.

تعاملات دارویی

Tofacitinib can interact with several medications, which may affect its efficacy or increase the risk of side effects. Major drug interactions include:

• سرکوب کننده سیستم ایمنی: مصرف همزمان با سایر داروهای سرکوب کننده سیستم ایمنی ممکن است خطر ابتلا به عفونت را افزایش دهد.
• Strong CYP3A4 Inhibitors (e.g., ketoconazole): Increase tofacitinib levels; requires dose reduction to 5 mg once daily. CYP3A4 Inducers (e.g., rifampin): Decrease levels; monitor efficacy.
• واکسن‌های زنده: Patients on Tofacitinib should avoid live vaccines due to the risk of infections.

همیشه پزشک خود را در مورد تمام داروها و مکمل هایی که مصرف می کنید مطلع کنید.

Benefits of Tofacitinib

Tofacitinib offers several clinical and practical advantages:

• شروع سریع عمل: بسیاری از بیماران ظرف چند هفته پس از شروع درمان، تسکین علائم را تجربه می‌کنند.
• مدیریت راحت: The oral tablet form allows for easy self-administration.
• موثر برای شرایط چندگانه: Tofacitinib is effective for various autoimmune diseases, making it a versatile treatment option.
• بهبود کیفیت زندگی: By managing symptoms effectively, Tofacitinib can significantly enhance patients' daily functioning and overall wellbeing.

Contraindications of Tofacitinib

Certain individuals should avoid using Tofacitinib, including:

• حساسیت مفرط: Patients with known hypersensitivity to tofacitinib should not use this medication.
• زنان باردار یا شیرده: Safety during pregnancy not established (embryofetal toxicity in animals); recommend effective contraception. Avoid during breastfeeding.
• بیماری شدید کبدی: بیماران مبتلا به اختلال قابل توجه کبد نباید از این دارو استفاده کنند.
• عفونت های فعال: Individuals with active infections should not start Tofacitinib until the infection is resolved.

هشدارها و هشدارها

Before starting Tofacitinib, patients should undergo specific lab tests to assess their overall health, including:

• Tuberculosis Screening: Test for latent tuberculosis before and during treatment if risk factors emerge.
• تست های عملکرد کبد: Regular monitoring of liver enzymes is recommended.
• ضربان خون: Periodic blood tests to monitor white blood cells and platelet counts are necessary.

Patients should also be aware of the signs of serious infections and report any symptoms such as fever, chills, or persistent cough to their healthcare provider.

سوالات متداول

• What is Tofacitinib used for? Tofacitinib is used to treat rheumatoid arthritis, psoriatic arthritis, and ulcerative colitis in adults.
• How is Tofacitinib taken? Tofacitinib is taken orally in tablet form, usually twice a day or once daily, depending on the condition being treated.
• عوارض جانبی رایج چیست؟ Common side effects include headache, nausea, diarrhea, and upper respiratory infections.
• Can I take Tofacitinib with other medications? Inform your doctor about all medications you are taking, as Tofacitinib can interact with several drugs.
• Is Tofacitinib safe during pregnancy? Safety during pregnancy not established (embryofetal toxicity risks); avoid unless prescribed?use effective contraception.
• How quickly does Tofacitinib work? Many patients may notice symptom relief within a few weeks of starting Tofacitinib.
• اگر یک نوبت را فراموش کردم چه باید بکنم؟ If you miss a dose, take it as soon as you remember. If it's almost time for your next dose, skip the missed dose, do not double dose, and continue with your regular schedule.
• Are there any serious risks associated with Tofacitinib? Yes, Tofacitinib can increase the risk of serious infections, blood clots, and liver problems.
• Can I receive vaccinations while on Tofacitinib? Live vaccines should be avoided while taking Tofacitinib. Consult your doctor for guidance on vaccinations.
• How long will I need to take Tofacitinib? The duration of treatment varies depending on individual and condition. Your doctor will determine the appropriate length of the therapy.

نام های تجاری

Tofacitinib is marketed under several brand names, including:

• Xeljanz
• Xeljanz XR (extended release)
• Zinvo (generic in some markets)

نتیجه

Tofacitinib is a valuable medication for managing autoimmune diseases such as rheumatoid arthritis, psoriatic arthritis, and ulcerative colitis. Its mechanism of action, ease of use, and rapid onset of relief make it a preferred choice for many patients. However, it is essential to be aware of potential side effects, drug interactions, and contraindications. Always consult your healthcare provider for personalized advice and treatment plans.