Compounded T3/T4

What is compounded T3/T4?

Compounded T3/T4 — sometimes called compounded thyroid medication — is a thyroid hormone preparation custom-made by a compounding pharmacy rather than mass-manufactured. A compounding pharmacist combines Liothyronine (T3) and levothyroxine (T4) — and sometimes only T3 — into a single capsule using ingredients chosen for the individual patient. Compounding allows precise, non-standard ratios, slow-release T3, and the removal of fillers, dyes, and gluten that some patients react to.

Compounded thyroid is most often used for Hypothyroidism — particularly in patients with Hashimotos Thyroiditis, post-thyroidectomy, or post-Radioactive Iodine Ablation — when standard tablets do not match the patient's needs.

How does compounded T3/T4 work?

The medication itself works the same way as commercial thyroid hormone: T4 acts as a steady storage form that the body converts to T3, while T3 binds directly to thyroid hormone receptors and activates the genes that govern metabolism, body temperature, heart rate, mood, and cognition.

The difference is in the delivery:

• Custom ratios. A patient who does best on, say, 50 mcg T4 plus 7.5 mcg T3 can get exactly that combination in one capsule, instead of trying to combine off-the-shelf strengths.
• Slow-release T3. Standard liothyronine peaks fast and wears off by mid-afternoon, which can produce energy crashes and palpitations. Compounded sustained-release T3 smooths the curve.
• Filler-free formulations. Patients sensitive to lactose, corn, gluten, soy, or specific dyes can have those removed.
• Strengths between standard doses. Useful for fine-tuning rather than jumping by 25 mcg at a time.

When is it prescribed?

Compounded T3/T4 is typically considered when:

• A patient does not feel well on Levoxyl, Synthroid, or Natural Desiccated Thyroid despite normal labs.
• Standard liothyronine causes palpitations or afternoon crashes (slow-release T3 helps).
• A patient has confirmed sensitivities to fillers in commercial thyroid medications.
• Vegetarian or religious preferences rule out porcine NDT.
• Pediatric or unusual dosing needs require precise strengths.

Patient considerations

Compounded medications are not FDA-approved in the same way commercial drugs are; potency depends on the pharmacy's quality control. Choosing a reputable, accredited compounding pharmacy matters. Insurance often does not cover compounded thyroid, so out-of-pocket cost is a factor. Side effects mirror any T3-containing medication: palpitations, jitteriness, insomnia, anxiety, tremor, sweating, and over time, bone loss or atrial fibrillation if over-replaced. Compounded T3/T4 is not appropriate for untreated adrenal insufficiency, uncorrected hyperthyroidism, or unstable cardiac disease, and pregnancy is usually managed with standardized T4-based regimens.

Monitoring should always include TSH, Free T4, and Free T3 alongside symptoms. At Modern Thyroid Clinic, compounded thyroid is one of several tools we use when commercial medications cannot quite get a patient to where she feels well.