Synthroid in Focus: Uses, Dosing, Price, Side Effects - in Australia

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Levothyroxine sodium, commonly sold under brand names such as Synthroid, is a synthetic thyroid hormone (T4) used to replace deficient thyroid hormone. It is widely prescribed for low thyroid function and is also used in some benign and malignant thyroid conditions to restore or maintain normal thyroid hormone levels.

If you want quick navigation, go to instructions on timing and food at Taking levothyroxine properly, see available tablet strengths at Form Types and Strength levels for the dosage, or review again more options and estimated costs at Other options with pricing options.

Markers and Applications

Levothyroxine is prescribed for the following clinical situations:

• Primary and central hypothyroidism where the body does not make enough thyroid hormone.
• Treatment or prevention of some types of goitre.
• Part of the management strategy for certain thyroid cancers, often following thyroid surgery or radioiodine therapy.

It works by supplementing circulating T4 so that tissues receive an appropriate hormonal signal. Clinical improvement may be gradual; laboratory tests are used to guide dose adjustments. For critical steps after missing a dose and administration details, see How to take responsibility levothyroxine safely.

Drug Forms and Strength Levels

Tablets are the usual formulation. Strengths on hand commonly found in Australia include:

• 25 mcg
• 50 mcg
• 75 mcg
• a dose of 100 micrograms
• 125 microgram unit dose
• 150 mcg per dose
• a dose of 200 mcg

Dosage is individualized. Doctors select a starting dose and adjust by vigilant monitoring serum TSH and free T4 levels. The younger crowd, older adults, and people with heart disease often require different starting regimens.

Levothyroxine consumption: how to handle it

Follow your prescriber or pharmacist directions exactly. To promote predictable absorption:

• Take the tablet with a full glass of water on an empty stomach, ideally 30 to 60 minutes before breakfast, at the same time each day.
• Avoid calcium or iron supplements, and antacids containing aluminium or magnesium, within four hours of your dose.
• If swallowing is difficult, tablets may be crushed and mixed with 1 to 2 teaspoons (5 to 10 mL) of water and given immediately. Do not store any remaining mixture and do not mix with soy-based infant formula.
• Continue treatment even if you feel well unless a clinician advises otherwise. Hypothyroidism is usually a long-term condition.
• If you miss taking one dose, take it as soon as you remember unless the next dose is near; do not double up doses.

It can take several weeks to see full symptom relief. If you are considering brand switches, consult your prescriber because different excipients can affect absorption; see also Human global teams rely on robust the interaction between participantss. of Drugs with Foods.

Warehousing and Handling Procedures

• Store between 20 to 25 C (68 to 77 F). Short excursions between 15 and 30 C (59 to 86 F) are usually acceptable.
• Protect tablets from moisture, heat and strong light. Avoid storing in humid places such as bathrooms.
• Keep all medications out of reach of children and pets and in their original packaging when possible.

General Safety Notice of warning and Precautionary Steps

When you should not use

• Do not use levothyroxine if you have a known allergy to it or any tablet ingredient.
• Avoid starting levothyroxine in untreated adrenal insufficiency or active, untreated hyperthyroidism.
• Recent myocardial infarction is a relative contraindication unless a treating physician advises otherwise.

Before you begin the process

• Tell your clinician if you are pregnant, planning pregnancy, or breastfeeding.
• Provide a complete list of prescription medicines, over-the-counter drugs, vitamins and herbal products you use.
• Mention any history of heart disease, high blood pressure, bleeding disorders, diabetes, osteoporosis, pituitary or adrenal gland problems, or difficulty swallowing.
• If you have malabsorption syndromes or gastrointestinal surgery that may affect drug uptake, advise your prescriber.

Daily information on safety

• Do not exceed the dose that is prescribed to you. Excess thyroid hormone can harm the heart.
• Inform all treating clinicians, including dentists and emergency staff, that you are taking levothyroxine.
• Blood glucose control can change in people with diabetes when thyroid status is altered; monitor and discuss medication adjustments with your doctor.
• Some foods and supplements can affect absorption; keep a steady routine and discuss diet consult with your clinician.
• Temporary dip in hair density can occur early in therapy but usually resolves.
• Regular blood tests (for example TSH) and, for minors, growth the act of monitoring are commonly required.
• Older adults may be more sensitive to the effects of thyroid hormone and require more cautious dosing.
• Do not use levothyroxine for weight loss or to enhance athletic performance; this is unsafe and not an approved use.

How Drugs Interact with Food

Many medications and some foods modify levothyroxine absorption or metabolism. Always discuss effective the give and take of interactions require clear communication. with your healthcare team. Examples include:

• Agents that reduce absorption: calcium supplements, iron supplements, antacids with aluminium or magnesium, sucralfate, bile acid sequestrants such as cholestyramine or colestipol, sevelamer, and orlistat.
• Drugs that alter thyroid hormone levels: anticonvulsants like carbamazepine and phenytoin, rifampicin, some antidepressants, amiodarone, certain cancer therapies such as tyrosine kinase inhibitors, and estrogen-containing products.
• Anticoagulants: warfarin effect may be increased as thyroid status is restored; close active monitoring of INR is advised.
• Diabetes, a chronic glucose problem medicines: dose adjustments may be needed as metabolic rate changes.
• Multivitamins and fiber preparations: can interfere when taken near the time of your levothyroxine dose.

Dietary items that can lower average absorption include high-fiber diets, soy products, walnuts and cottonseed meal. Keep timing consistent; see Step by step guide to taking levothyroxine for guidance on timing relative to meals and supplements.

Possible treatment unintended effects

When the dose is appropriate most people tolerate levothyroxine well. Symptoms of excessive replacement resemble hyperthyroidism. Seek prompt medical help for serious signs.

Get prompt medical attention for difficulty breathing any of the following:

• Allergic reactions such as rash, hives, swelling of the face, lips or throat, severe itching or breathing difficulties.
• Heart-related symptoms such as rapid or irregular heartbeat, chest pain, or shortness of breath.
• Severe nervous system or mood disturbances including marked anxiety, tremor, seizures, severe headache or new onset insomnia.
• Other concerning effects such as high body temperature, excessive sweating, severe diarrhoea or vomiting, muscle weakness or cramps, unexplained weight loss, or major changes in menstrual patterns.

Not all items are shown in this list. Please report any new or concerning symptoms to your care team.

Alternative options with quote pricing in AUD

Other medicines and options

• Other levothyroxine brand products available in Australia include Eltroxin and Oroxine; generic levothyroxine tablets are also commonly supplied. These contain the same active drug, but formulations differ slightly and brand changes should be managed by a clinician.
• Liothyronine (T3), marketed as Tertroxin in some markets, is used in selected situations and sometimes in combination with T4 under specialist supervision.
• Desiccated porcine thyroid extracts are not commonly used in Australia and are not PBS-listed; potency and consistency are variable and specialist oversight is recommended if considered.

Indicative cost of living in Australia (AUD)

Prices can vary by pharmacy, state and whether the product is PBS-subsidised. Approximate ranges:

• PBS-listed levothyroxine: the general patient co-payment is typically up to around AUD 32 per prescription, while concession card holders usually pay a lower amount around AUD 7.70. Exact rates depend on current PBS settings.
• Private scripts for generic levothyroxine may be priced between about AUD 6 and 25 per pack of 100 tablets depending on strength and supplier.
• Liothyronine (T3) tends to be more expensive on a per-tablet basis; private costs may commonly be in the order of AUD 25 to 50 per pack, subject to availability.

These figures are approximate and change over time. Advise to seek counsel your local pharmacy or the current PBS schedule for up-to-date personalized pricing. If switching brands, discuss observation and tracking plans with your prescriber.

The status under Australian legislation

• Prescription requirement: Levothyroxine is a Schedule 4 prescription-only medicine situated in Australia. A valid prescription from an authorised prescriber is required to obtain it.
• PBS availability: Many levothyroxine preparations are listed on the Pharmaceutical Benefits Scheme and may be subsidised for eligible patients.
• Personal importation: Under the TGA Arrangement for Personal Importation individuals may import a limited personal supply with a valid prescription. Please check the data Therapeutic Goods Administration and Australian Border Force for current rules before importing medication.
• Sporting considerations: Thyroid hormones are not generally prohibited by major anti-doping bodies, but inappropriate or off-label use is unsafe. Athletes should document medical need and consult Sport Integrity Australia when relevant.
• Driving and work safety: When appropriately dosed levothyroxine is not expected to impair alertness. If you feel symptomatic, avoid operating heavy machinery or driving until you are well.

For clinical dosing details consult How to administer levothyroxine kindly speak alongside your prescriber.

Get More Information

Pharmacologically active ingredient: levothyroxine sodium.

Maintain a consistent routine for taking your medication, attend scheduled blood tests to check TSH and free T4, and do not alter the dose without professional advice. If you are concerned about potential social interplay between partiess influence perceptions and decisions., see Drug and Food Interaction Essentials consider consulting your pharmacist or physician.

For travel or import questions consult the TGA website and your prescribing clinician before making arrangements to bring medication into Australia.