Thyroxine 100 mcg tablets contain levothyroxine sodium, a synthetic form of the thyroid hormone thyroxine (T4). This medicine is primarily used to treat an underactive thyroid (hypothyroidism) by replacing the hormone the body does not produce in sufficient amounts.
Thyroxine 100 mcg contains levothyroxine sodium, a synthetic thyroid hormone that replaces naturally occurring thyroxine. It belongs to the thyroid hormone replacement class of medicines.
The medicine helps restore thyroid hormone levels and manage symptoms associated with hypothyroidism. The required dose varies according to thyroid function test results, age, medical history, and other individual factors.
Thyroxine 100 mcg may be prescribed to:
Treat an underactive thyroid (hypothyroidism).
Replace thyroid hormone when the thyroid gland does not produce enough thyroxine.
Manage certain thyroid conditions following thyroid surgery or other thyroid treatments, when indicated by a healthcare professional.
The appropriate treatment and dose should be determined by a healthcare professional using thyroid function tests and the patient's medical history.
Levothyroxine replaces thyroxine (T4), a hormone normally produced by the thyroid gland. The body converts some T4 into triiodothyronine (T3), the more active thyroid hormone that helps regulate metabolism, energy use, body temperature, and other functions.
As thyroid hormone levels return towards the appropriate range, symptoms of hypothyroidism may gradually improve. Noticeable improvement can take several weeks, and blood tests help determine whether the dose needs adjustment.
Take Thyroxine 100 mcg exactly as prescribed by your healthcare professional.
Take it once daily if prescribed, preferably on an empty stomach, 30–60 minutes before breakfast.
Swallow the tablet with water.
Take it at the same time each day to maintain consistent absorption.
Keep calcium and iron supplements, antacids, and other products that can interfere with absorption separated from levothyroxine according to your healthcare professional's instructions.
If you miss a dose, follow the patient information leaflet or ask your pharmacist for advice. Do not take two doses together to make up for a missed dose.
Do not change the dose or stop treatment without medical advice.
Attend recommended thyroid function blood tests to check whether your dose remains appropriate.
The dose of levothyroxine may need adjustment over time based on blood test results and changes in health status.
Tell your doctor or pharmacist about your medical history and all medicines, vitamins, supplements, and herbal products you use.
Use Thyroxine 100 mcg with particular medical guidance if you have:
Heart disease: Conditions such as coronary artery disease, angina, or an irregular heartbeat may affect treatment decisions.
Adrenal gland problems: Untreated adrenal insufficiency must be assessed before starting thyroid hormone replacement.
Diabetes: Levothyroxine may affect blood glucose control and the requirements for diabetes medicines.
An overactive thyroid: Thyroid hormone replacement may be inappropriate unless specifically directed for a particular treatment plan.
Important interactions include calcium and iron supplements, antacids, certain medicines for epilepsy, some medicines that reduce stomach acid, and other medicines that affect thyroid hormone levels. Levothyroxine may also affect the response to anticoagulants such as warfarin. Biotin supplements can interfere with some thyroid blood tests.
Check potential interactions with your doctor or pharmacist before starting, stopping, or changing any medicine or supplement.
Levothyroxine is commonly used during pregnancy when needed to treat hypothyroidism. Adequate thyroid hormone levels are important during pregnancy, and the required dose may change. Regular thyroid function monitoring is therefore important.
Levothyroxine can generally be used during breastfeeding when medically indicated. Tell your doctor if you are pregnant, planning a pregnancy, or breastfeeding so that treatment and monitoring can be reviewed appropriately.
Like all medicines, Thyroxine 100 mcg can cause side effects, although not everyone experiences them.
Side effects are more likely when the dose is higher than required and may include:
Headache
Difficulty sleeping
Nervousness or anxiety
Increased sweating
Palpitations or a rapid heartbeat
Diarrhoea or other digestive discomfort
Seek urgent medical attention if you experience chest pain, a severe or irregular heartbeat, difficulty breathing, or signs of a serious allergic reaction. Contact your healthcare professional if side effects persist or you think your dose may be too high.
This is not a complete list of side effects or warnings. Please refer to the product packaging and patient information leaflet supplied with your medicine for complete information and speak with your doctor or pharmacist if you have concerns.
Store Thyroxine 100 mcg according to the instructions shown on the original product packaging.
Keep the tablets in their original packaging to protect them from moisture.
Protect the medicine from excessive heat and light where specified by the manufacturer.
Keep it out of reach of children.
Do not use the tablets after their expiry date.
Exact storage requirements may vary according to the manufacturer and packaging type.
Thyroxine 100 mcg is used to treat an underactive thyroid by replacing the thyroid hormone the body does not produce in sufficient amounts. It helps restore thyroid hormone levels and manage associated symptoms.
Thyroid hormone levels begin responding to treatment, but symptom improvement may take several weeks. Blood tests help determine whether treatment is working as intended and whether the dose needs adjustment.
It is generally taken on an empty stomach, 30–60 minutes before breakfast, with water. Food and certain drinks or supplements can reduce or alter its absorption.
Some treatment plans allow levothyroxine to be taken at bedtime, provided it is taken consistently and sufficiently separated from food. Ask your healthcare professional before changing your usual schedule.
Do not stop treatment without medical advice. Hypothyroidism often requires long-term hormone replacement, and symptoms may return if treatment is discontinued.
Generic levothyroxine contains the same active ingredient as branded levothyroxine products at the same strength. However, formulations and inactive ingredients can differ, so discuss any product change with your pharmacist or doctor.
Yes. Thyroid function blood tests are used to assess treatment response and determine whether the dose is appropriate. Monitoring may be more frequent after starting treatment, changing the dose, or during pregnancy.
