What is the equivalent of levothyroxine (T4) 100mcg to Armour Thyroid (desiccated thyroid)?

From the Research

Equivalent Dosage of Armour Thyroid to Levothyroxine

The equivalent dosage of Armour Thyroid (desiccated thyroid) to levothyroxine (T4) 100mcg is not directly stated in the provided studies. However, some studies provide information on the ratio of levothyroxine to liothyronine (T3) and the dosage of desiccated thyroid.

• The study 1 found that the therapeutic substitution of liothyronine (L-T3) for levothyroxine (L-T4) was achieved at approximately a 1:3 ratio.
• The study 2 mentions that the dose range of natural desiccated thyroid (NDT) was 60-180 mg daily, but it does not provide a direct conversion to levothyroxine dosage.
• The study 3 discusses the empirical use of Armour thyroid, but it does not provide a specific dosage conversion.

Factors Affecting Levothyroxine Dosage

Several factors can affect the dosage of levothyroxine, including:

• Genetic polymorphism 4
• Age, sex, and body weight 5
• Concurrent medications and patient compliance 4

Dosage Calculation

The study 5 suggests that a weight-based formula (1.5 μg/kg) can be used to calculate the initial levothyroxine dosage after thyroidectomy. However, this formula may not be directly applicable to the conversion of levothyroxine to Armour Thyroid.

It is essential to note that the conversion of levothyroxine to Armour Thyroid is complex and may require individualized calculation based on various factors, including the patient's thyroid hormone levels, medical history, and response to treatment.