Armour Thyroid vs. Cytomel
See how Armour Thyroid and Cytomel compare on approved uses, dosing, side effects, and cost.
Key Takeaways
Armour Thyroid combines T4 and T3 from desiccated pork gland, while Cytomel is a purely synthetic T3 medication.
Armour Thyroid typically costs less but can vary batch to batch, while Cytomel offers consistent synthetic dosing at a higher price.
Cytomel acts faster and clears the body sooner, useful for diagnostic testing, while Armour Thyroid provides steadier, longer-lasting hormone support.
Armour Thyroid vs. Cytomel Drug Summary
Armour Thyroid
Armour Thyroid is a natural desiccated thyroid hormone replacement made from porcine thyroid gland, containing both T4 and T3. It treats hypothyroidism and helps suppress TSH in certain thyroid conditions, taken once daily as an oral tablet.
Cytomel
Cytomel is a synthetic form of T3 called liothyronine, used to treat hypothyroidism and suppress TSH in thyroid cancer. It is taken once daily as an oral tablet and works faster than T4-based therapies.
Armour Thyroid vs. Cytomel Side Effects
Armour Thyroid
Cytomel
Armour Thyroid vs. Cytomel Dosage
Armour Thyroid
Cytomel
| STAGE | DOSE | WHEN |
| Starting dose | 15 mg once daily | At the start |
| Maximum dose | 60-120 mg once daily | If needed |
| Dose changes | 3 increases | As tolerated |
| STAGE | DOSE | WHEN |
| Starting dose | 5 mcg once daily | At the start |
| Maximum dose | 75-100 mcg once daily | Days 1-7 |
| Dose changes | 3 increases | As tolerated |
Armour Thyroid
| STAGE | DOSE | WHEN |
| Starting dose | 15 mg once daily | At the start |
| Maximum dose | 60-120 mg once daily | If needed |
| Dose changes | 3 increases | As tolerated |
Cytomel
| STAGE | DOSE | WHEN |
| Starting dose | 5 mcg once daily | At the start |
| Maximum dose | 75-100 mcg once daily | Days 1-7 |
| Dose changes | 3 increases | As tolerated |
Armour Thyroid vs. Cytomel Indications
Armour Thyroid
Armour Thyroid replaces missing thyroid hormone in people with hypothyroidism from any cause. Doctors also prescribe it to suppress TSH production in conditions like thyroid nodules, Hashimoto's thyroiditis, and thyroid cancer.
Replacement therapy for primary, secondary, or tertiary hypothyroidism
TSH suppression in thyroid nodules
TSH suppression in Hashimoto's thyroiditis
Cytomel
Cytomel replaces thyroid hormone in people with hypothyroidism, using only the active T3 form. It is also used to suppress TSH in thyroid cancer and as a diagnostic tool to test thyroid gland function.
Replacement therapy for primary, secondary, or tertiary hypothyroidism
TSH suppression in well-differentiated thyroid cancer
Diagnostic aid for thyroid suppression testing
Armour Thyroid vs. Cytomel Pros and Cons
Armour Thyroid
Armour Thyroid provides both T4 and T3 from a natural animal source, which some patients find gives more balanced symptom relief. Its main drawbacks come from being an extract rather than a purified synthetic compound, which can affect consistency and supply.
Pros
Contains both T4 and T3, closer to natural thyroid hormone balance
Long history of clinical use dating back before 1938
Lower typical list price, roughly $40 to $155 per month
Simple once-daily tablet dosing
Cons
Batch-to-batch hormone variability since it is an animal-derived extract
Frequent supply shortages and recalls
Not FDA-approved through the standard new drug application process
Unpredictable T4-to-T3 ratio can complicate fine-tuning of doses
Cytomel
Cytomel delivers a precise, synthetic dose of active T3 hormone, giving predictable and consistent effects. It costs more on average and carries specific warnings around cardiac risk and misuse for weight loss.
Pros
FDA-approved synthetic formulation with consistent potency
Rapid onset of action within hours, useful for diagnostic testing
Shorter duration allows quicker adjustment if side effects occur
Precise, standardized dosing due to synthetic manufacturing
Cons
Higher typical list price, roughly $80 to $300 per month
Only supplies T3, so full replacement may need an added T4 product
Increased risk of cardiac events, including atrial fibrillation, in elderly patients
Carries a boxed warning against use for weight loss
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