FDA's Proposed Ban on Natural Desiccated Thyroid: What Patients Need to Know

FDA's Plan for Natural Desiccated Thyroid

• 🎯 The FDA has announced a plan to withdraw permission for natural desiccated thyroid extract (DTE), impacting over 1.5 million patients.
• ⚠️ Physicians are being asked to switch patients from DTE to levothyroxine, a synthetic T4 hormone.
• ❓ Many patients on DTE likely tried levothyroxine previously and found it insufficient to resolve their symptoms.

Hypothyroidism Treatment Challenges

• 💡 While 80-85% of hypothyroidism patients respond well to levothyroxine (T4), a significant minority (15-20%) remain symptomatic.
• 🧠 The issue may lie in the body's ability to convert T4 into the active T3 hormone, leading to T3 insufficiency.
• 🩺 Current standard practice often relies solely on TSH levels, potentially overlooking T3 deficiency and persistent symptoms.

Research on Combination Therapy and DTE

• 🔬 Dr. Antonio Biano's research suggests that combination therapy (T4 and T3) or DTE may be safer and more effective than levothyroxine alone.
• 📈 A large retrospective study indicated that patients on combination therapy had a 30% reduction in mortality and a reduced diagnosis of dementia compared to those on levothyroxine alone.
• 📊 Even with normal TSH levels, patients on levothyroxine alone may have slightly elevated cholesterol, potentially indicating a hypothyroid liver, and often require statins.

Patient Concerns and Advocacy

• 😟 Patients relying on DTE fear experiencing a return of hypothyroid symptoms like brain fog, fatigue, weight gain, and cold intolerance if switched back to levothyroxine.
• 📢 Patient advocates and professional societies (American Thyroid Association, American Clinical Endocrinology Society) are concerned and urging the FDA to reconsider.
• ⚖️ Concerns exist about the potential cost increase if DTE is approved as a biologic drug, making it unaffordable for many.

Understanding Thyroid Testing and Symptoms

• 🔍 Key thyroid tests include TSH, free T4, and free T3, with optimal TSH often below 2.5 and free T3 in the upper half of the reference range.
• ⚠️ Common hypothyroidism symptoms include severe fatigue, brain fog, weight gain, dry skin, hair loss, constipation, and depression.
• 🇨🇦 The possibility of importing DTE from Canada is uncertain due to its potential designation as an unapproved biologic, with a risk of crackdowns.