Levotiroxine Aristo 175 micrograms tablets

Package leaflet: Information for the user

Introduction

Package leaflet: information for the patient

Levotiroxina Aristo 175 micrograms tablets

levotiroxina sódica

Read the entire leaflet carefully before you start taking this medicine, because it contains important information for you.

• Keep this leaflet, as you may need to read it again.
• If you have any questions, ask your doctor or pharmacist.
• This medicine has been prescribed for you only, and you should not give it to others, even if they have the same symptoms as you, because it may harm them.
• If you experience any adverse effects, consult your doctor or pharmacist, even if they are adverse effects not listed in this leaflet. See section 4.

Contents of the leaflet

1. What Levotiroxina Aristo is and what it is used for
2. What you need to know before taking Levotiroxina Aristo
3. How to take Levotiroxina Aristo
4. Possible side effects
5. How to store Levotiroxina Aristo
6. Contents of the pack and other information

1. What Levotiroxina Aristo is and what it is used for

Thyroxine is a hormone naturally produced in the body by the thyroid gland. Sodium levothyroxine is a synthetic thyroid hormone that is chemically identical to this hormone.

This medicine is used to replace missing thyroid hormone or to reduce stress on the thyroid gland.

Levotiroxina is used for:

• replacing the missing thyroid hormone in all forms of underactive thyroid function (hypothyroidism) or after removal of the thyroid gland,
• preventing the recurrence of new goiters after goiter surgery in patients with normal thyroid function,
• treating non-malignant goiter (benign struma) in patients with normal thyroid function, as additional therapy in antithyroid treatment of an overactive thyroid, after metabolic normality has been achieved,
• malignant thyroid tumors, particularly after surgery, to suppress the growth of new tumors and as a supplement for missing thyroid hormone.

2. What you need to know before starting to take Levotiroxina Aristo

Do not take Levotiroxina:

• if you are allergic to levothyroxine or to any of the other ingredients of this medicine (listed in section 6);

• if you have a condition caused by overactivity of the thyroid gland that is untreated (hyperthyroidism, thyrotoxicosis);

• if you have adrenal gland dysfunction (adrenal insufficiency) and do not have adequate replacement therapy;

• if you have untreated pituitary gland deficiency;

• if you have any of the following diseases or conditions:

• acute myocardial infarction,

• acute inflammation of the heart muscle (myocarditis),

• acute inflammation of all layers of the heart (pancarditis),

• if you are pregnant, do not take levothyroxine together with other medications used to treat overactive thyroid (antithyroid drugs).

Before starting treatment with levothyroxine, the following disorders or conditions should be ruled out or treated:

• coronary heart disease,
• chest pain with tightness in the chest (angina pectoris),
• fatty deposits in the arteries (arteriosclerosis),
• high blood pressure (hypertension),
• conditions in which the pituitary/adrenal glands do not produce sufficient hormones (hypopituitarism and/or adrenal cortical insufficiency),
• areas of the thyroid gland producing uncontrolled amounts of thyroid hormone (thyroid autonomy).

Warnings and precautions

Thyroid hormones must not be used for weight loss. Taking thyroid hormones will not reduce your weight if your thyroid hormone levels are within the normal range. If you increase the dose without specific medical indication, you may experience serious adverse effects or even life-threatening complications, especially when combined with certain weight-loss products (see section 2 “Other medicines and levotiroxina”).

If you need to switch from your current medication to another containing levothyroxine, thyroid imbalance may occur. Speak with your doctor if you have any concerns about changing your medication. Close monitoring (clinical and biological) is required during the transition period. Inform your doctor if you experience any adverse effects, as this may indicate the need to adjust your dose upward or downward.

Consult your doctor or pharmacist before taking levotiroxina:

• if you have congenital or childhood-acquired hypothyroidism;
• if you have heart problems such as angina pectoris, coronary heart disease, weak heart muscle, cardiac rhythm disorders, high blood pressure, or arteriosclerosis;
• if you recently suffered a heart attack;
• if you are being treated with certain anticoagulants (blood-thinning medicines) (e.g., phenprocoumon). You may need to adjust the dose of this medicine (see section 2 “Other medicines and levotiroxina”);
• if you have diabetes, as your antidiabetic treatment dose may need adjustment, since levothyroxine may increase blood sugar levels (see section 2 “Other medicines and levotiroxina”);
• in postmenopausal women: your thyroid function should be monitored more frequently to avoid elevated levothyroxine levels in the blood, which may lead to osteoporosis (brittle bones);
• if you have epilepsy (seizures): epileptic seizures have rarely been reported when starting levothyroxine treatment or increasing the dose rapidly;
• if you have myxoedema (swelling of the skin and subcutaneous tissue), as a lower dose of levothyroxine may be required;
• if you have intestinal disease, as this may also impair drug absorption (malabsorption syndromes, e.g., celiac disease, lactose intolerance), and you may require additional treatment to ensure effective levothyroxine therapy;
• if you have underactive adrenal glands (adrenal insufficiency), pituitary gland dysfunction, or thyroid gland dysfunction with uncontrolled overproduction of thyroid hormones, as these conditions must be medically managed before starting levothyroxine.
• If you are undergoing laboratory tests to monitor your thyroid hormone levels, inform your doctor or laboratory staff that you are taking or have recently taken biotin (also known as vitamin H, vitamin B7, or vitamin B8). Biotin may interfere with laboratory test results. Depending on the test, results may be falsely elevated or falsely reduced due to biotin. Your doctor may instruct you to stop taking biotin before blood tests. You should also be aware that other products you may be taking, such as multivitamin preparations or supplements for hair, skin, and nails, may also contain biotin. This could affect laboratory test results. Inform your doctor or laboratory staff if you are taking these products (refer to the information in section “Other medicines and levotiroxina”).

Contact your doctor if you experience signs of psychotic disorders.

Blood pressure will be monitored periodically when starting levothyroxine treatment in very low birth weight premature infants, as a rapid drop in blood pressure (known as circulatory collapse) may occur.

In elderly patients, the dose should be carefully and individually adjusted, especially in those with heart conditions, and they should be closely supervised by their doctor.

Blood tests
Before starting levotiroxina, your doctor will perform a blood test to determine how much thyroxine your thyroid gland is producing and what dose of medication you require. Once you begin taking the medicine, your doctor will arrange for regular blood tests to ensure the treatment is working properly.

Other medicines and levotiroxina

Inform your doctor or pharmacist if you are taking or have recently taken any other medicines. This includes over-the-counter medicines, herbal remedies, and vitamin supplements. Many medicines affect how levothyroxine works. The effects of other medicines may also be affected by levothyroxine.

If you are about to undergo a test using iodinated contrast agents, inform your doctor that you are taking levotiroxina.

If you are taking or have recently taken biotin, inform your doctor or laboratory staff when undergoing laboratory tests to monitor thyroid hormone levels. Biotin may affect laboratory test results (see Warnings and precautions).

The following medicines may affect how levotiroxina works:

• medicines used to treat epilepsy or seizures, such as carbamazepine, phenytoin, primidone, and barbiturates,
• products containing St. John’s wort (a herbal medicine),
• sertraline, lithium: used to treat depression, mood disorders, and anxiety disorders,
• statins such as simvastatin and lovastatin (used to treat high cholesterol),
• rifampicin, used to treat infections,
• 5-fluorouracil, imatinib, and sunitinib (used in anticancer [antineoplastic] treatment),
• β-receptor blocking medicines such as propranolol, atenolol, and sotalol, used to treat high blood pressure and heart problems,
• estrogen-containing medicines for hormone replacement therapy (HRT) and contraception ("the pill"),
• androgen-containing medicines for male hormone replacement therapy,
• glucocorticoids, such as cortisone, hydrocortisone, prednisolone, and dexamethasone, used to treat inflammation,
• amiodarone: used to treat irregular heartbeats,
• anti-inflammatory medicines, such as phenylbutazone or acetylsalicylic acid,
• methadone, used for opioid substitution treatment,
• furosemide: used to treat high blood pressure or edema,
• propylthiouracil, used to treat overactive thyroid,
• iodide (used to protect the thyroid gland from radiation),
• oral contrast agents – taken before certain imaging procedures to enhance visibility of body parts,
• chloroquine, proguanil, used for malaria prophylaxis and rheumatic diseases,
• ritonavir, used to control HIV and chronic hepatitis C virus,
• weight-loss medicines (e.g., orlistat),
• proton pump inhibitors (such as omeprazole, esomeprazole, pantoprazol, rabeprazol, and lansoprazol) used to reduce stomach acid production, which may reduce intestinal absorption of levothyroxine and thus reduce its effectiveness. If you are taking levotiroxina at the same time as a proton pump inhibitor, your doctor should monitor your thyroid function and may need to adjust your levothyroxine dose.

Levotiroxina should be taken at least 4–5 hours before taking the following medicines:

• calcium, magnesium, aluminum, iron, or lanthanum supplements;
• colestyramine, colestipol, or clofibrate (used to reduce blood cholesterol levels);
• sodium polystyrene sulfonate (used to treat kidney disease/nephropathy);
• orlistat (weight-loss medicines);
• cimetidine (used to reduce excess stomach acid);
• proton pump inhibitors, such as omeprazole, esomeprazole, used to treat excess stomach acid;
• sucralfate, antacids (used to treat stomach ulcers).

The following medicines may be affected by levotiroxina:

• anticoagulant medicines to prevent blood clotting, such as warfarin, dicoumarol, and phenprocoumon;
• medicines used to treat diabetes, such as insulin and metformin;
• tricyclic antidepressants, such as amitriptyline, imipramine, and dosulepin;
• medicines that stimulate the sympathetic nervous system, such as adrenaline (used to treat severe allergic reactions) or phenylephrine (a decongestant found in many cold and flu remedies);
• digoxin, used to treat heart problems;
• phenytoin, an antiepileptic medicine.

Taking levotiroxina with food and drink

Soy-containing products and high-fiber foods may affect the absorption of levotiroxina. As a result, your doctor may need to adjust your levothyroxine dose.

Pregnancy and breastfeeding

If you are pregnant or breastfeeding, think you may be pregnant, or plan to become pregnant, consult your doctor before taking this medicine.

Consistent thyroid hormone treatment is especially important during pregnancy and breastfeeding, and therefore must continue under the supervision of your treating doctor.

The need for levothyroxine may increase during pregnancy due to rising blood estrogen levels (female sex hormone). Therefore, thyroid function should be monitored during and after pregnancy, and the levothyroxine dose adjusted as necessary.

Even with high-dose levothyroxine treatment, the amount of thyroid hormone passing into breast milk during lactation is very low and therefore harmless.

Suppression tests must not be performed during pregnancy and breastfeeding.

Driving and using machines

Levotiroxina Aristo is not expected to have any influence on the ability to drive or operate machinery, as levothyroxine is identical to natural thyroid hormone.

Levotiroxina Aristo contains sodium

This medicine contains less than 23 mg of sodium (1 mmol) per tablet; hence, it is essentially “sodium-free”.

3. How to take Levotiroxina Aristo

Follow exactly the administration instructions for this medicine provided by your doctor or pharmacist. If in doubt, consult your doctor or pharmacist again.

Particular caution should be exercised when initiating treatment with thyroid hormones in elderly patients, patients with coronary heart disease, and patients with chronic or severe hypothyroidism. This means that a lower starting dose should be selected, which is then increased slowly and at longer intervals, with frequent monitoring of thyroid hormone levels.

Experience has shown that a lower dose is also sufficient in patients with low body weight and in patients with extensive nodular goiter.

Dosage

For individual treatment, the tablets are available in graduated strengths ranging from 25 to 200 micrograms of levothyroxine, meaning that in most cases only one tablet per day needs to be taken.

Your doctor will determine your individual dosage based on laboratory tests and examinations. Generally, treatment starts with a low dose, which is increased every 2 to 4 weeks until the full individual dose is reached. During the initial weeks of treatment, you will have laboratory appointments to adjust the dosage.

Administration The total daily dose should be taken in the morning on an empty stomach, at least half an hour before breakfast, since the active substance is better absorbed on an empty stomach than before or after a meal. The tablets should be swallowed whole, without chewing, with a glass of water.

For infants, the total daily dose should be given at least half an hour before the first meal of the day. To do this, the tablet may be allowed to dissolve in a small amount of water. If necessary, the tablet may be divided. However, crushing or dissolving the tablet in water or other liquids is not recommended, as the dose may not be accurate.

Levothyroxine may be divided into equal doses.

Duration of administration

You should take this medication for as long as your doctor advises.

If you have an underactive thyroid gland or have undergone surgery for malignant thyroid tumor, you will normally need to take levothyroxine for life.

For benign goiter and for prevention of recurrent goiter growth, you should take levothyroxine for a variable period ranging from several months or years up to lifelong treatment.

In additional therapy for the treatment of an overactive thyroid, you should take levothyroxine for as long as you are taking a thyrostatic medication.

For the treatment of benign goiter with normal thyroid function, a treatment period of 6 months to 2 years is necessary. If treatment with levothyroxine has not achieved the desired result within this period, other treatment options should be considered.

If you take more levothyroxine than you should

In case of overdose or accidental ingestion, contact your doctor or pharmacist immediately or call the Toxicology Information Service at telephone number: 91 562 04 20, indicating the medication and the amount ingested.

Signs of an overdose may include: restlessness, confusion, irritability, fever, chest pain (angina), rapid or irregular heartbeat, rapid breathing, muscle cramps, headache, agitation, hyperactivity, hot flushes, sweating, dilated pupils, diarrhea, tremors, difficulty sleeping, anxiety or nervousness, fatigue or emotional disturbances, seizures. These symptoms may take up to 6 days to appear. Bring all remaining tablets and this leaflet so that medical personnel know exactly what you have taken.

If you forget to take levothyroxine

If you miss a dose, take your usual dose at the next scheduled time. Do not take a double dose to make up for missed individual doses. If you are unsure, consult your doctor or pharmacist.

If you stop taking levothyroxine

For your treatment to be effective, you must take levothyroxine regularly at the dose prescribed by your doctor. Under no circumstances should you change, stop, or interrupt the prescribed treatment without consulting your doctor, as symptoms may reappear.

If you have any further questions about the use of this medication, ask your doctor or pharmacist.

4. Possible adverse effects

Like all medicines, this medicine can cause adverse effects, although not everyone will experience them.

Stop taking the tablets and go to hospital immediately if you experience:

• an allergic reaction such as swelling of the eyelids, tongue, lips and/or throat and/or difficulty swallowing or rash with breathing difficulties (angioedema), rash or itching (especially if affecting the whole body), joint pain, sensitivity to sunlight, general feeling of being unwell (frequency unknown). You may require urgent medical attention.

Some patients may experience a serious adverse reaction at high levels of thyroid hormone. This is known as "thyroid storm". Stop taking the tablets and go to hospital if you have any of the following symptoms (frequency unknown):

• Very high temperature, rapid heartbeat (tachycardia), irregular heartbeats, low blood pressure, heart failure, jaundice, confusion, seizures and coma.

Tell your doctor or pharmacist if any of the following adverse effects persist, worsen, or if you notice any adverse effects not listed below.

Most adverse effects are similar to those of an overactive thyroid gland (hyperthyroidism, where the thyroid gland produces too much thyroxine), especially if the dose is increased too quickly at the beginning of treatment. They usually resolve when the dose is reduced or treatment is stopped. Inform your doctor if side effects occur. He/she will decide whether the daily dose should be reduced or whether you should stop taking the tablets for a few days. However, you must not change the dose or stop taking the tablets without first consulting your doctor.

Frequency not known: frequency cannot be estimated from the available data.

• Increased appetite;
• restlessness, excitability, difficulty sleeping (insomnia);
• agitation (tremor), headache, seizures;
• chest pain (angina pectoris), palpitations, irregular heartbeats, pounding heartbeat (very strong heartbeats), heart failure, heart attack;
• high blood pressure, flushing;
• difficulty breathing (dyspnea);
• diarrhoea, vomiting, malaise, stomach pains;
• increased sweating, itching, skin rash, urticaria;
• muscle cramps, muscle weakness, joint pain;
• decreased bone density (osteoporosis), particularly in postmenopausal women taking high doses for prolonged periods;
• in women: irregular periods;
• fever (high temperature), swelling (oedema), general feeling of being unwell;
• weight loss;
• overactive thyroid (hyperthyroidism);

Additional side effects in children

Rare (may affect up to 1 in 1,000 people)

• increased intracranial pressure in children not caused by a tumour or other diseases (benign intracranial hypertension).

Frequency not known: frequency cannot be estimated from the available data

• premature cessation of a child's growth due to changes in bone growth;
• mild hair loss in children;
• skull deformity in babies caused by early closure of the joints in the skull bones (craniosynostosis);
• heat intolerance.

In case of hypersensitivity to levothyroxine or any of the other components of Levotiroxina Aristo, allergic reactions affecting the skin and respiratory tract may occur.

Reporting of adverse effects

If you experience any type of adverse effect, consult your doctor or pharmacist, even if it is a possible adverse effect not listed in this leaflet. You can also report them directly via the Spanish Pharmacovigilance System for Human Medicines: https://www.notificaram.es. By reporting adverse effects, you can help provide more information on the safety of this medicine.

5. Storage of Levothyroxine Aristo

Keep this medicine out of the sight and reach of children.

Do not use this medicine after the expiry date stated on the carton and blister pack after "EXP". The expiry date refers to the last day of the month indicated.

Do not store above 30 °C.

Medicines should not be disposed of via wastewater or household waste. Dispose of unused medicines and their packaging at the SIGRE Point at your pharmacy. If you are unsure, ask your pharmacist how to properly dispose of unused medicines and their packaging. This will help protect the environment.

6. Contents of the pack and other information

• The active substance is levothyroxine sodium anhydrous. Each tablet contains 175 micrograms of levothyroxine sodium anhydrous.
• The other components are microcrystalline cellulose, corn starch, heavy magnesium oxide, sodium carboxymethyl starch from corn (Type A), and vegetable magnesium stearate.

Nature of the product and pack contents

White, round, uncoated, biconvex tablets (bevelled edges) with a score line on one side and engraved with "175" on the other side. The tablets have an approximate diameter of 7 mm and an approximate height of 3 mm.

The tablets are presented in blisters in packs containing 25, 30, 50, 60, 90 and 100 tablets.

Only certain pack sizes may be marketed.

Marketing Authorization Holder

Aristo Pharma GmbH

Wallenroder Straße 8-10

13435 Berlin

Germany

Manufacturer

Aristo Pharma GmbH

Wallenroder Straße 8-10

13435 Berlin

Germany

For further information about this medicinal product, please contact the local representative of the Marketing Authorization Holder:

Aristo Pharma Iberia, S.L.

C/ Solana, 26

28850, Torrejón de Ardoz

Madrid, Spain

This medicinal product is authorized in the European Economic Area member states under the following names:

Austria: Levothyroxin Aristo 175 Mikrogramm Tabletten
Czech Republic: Levothyroxine Aristo 175 mikrogramu tablety
Germany: L-Thyroxin Aristo 175 Mikrogramm Tabletten
Ireland: Levothyroxine sodium Aristo 175 microgram tablets
Italy: Levotiroxina Aristo 175 mikrogrammi compresse
Netherlands: Levothyroxinenatrium Aristo 175 microgram tabletten
Poland: Eferox 175 mikrogramów tabletki
Portugal: Levotiroxina Aristo 175 microgramas comprimidos
Spain: Levotiroxina Aristo 175 microgramos comprimidos
Sweden: Levothyroxine Aristo 175 mikrogram tabletter

Date of the most recent review of this leaflet: December 2023

Other sources of information

Detailed information on this medicinal product is available on the website of the Spanish Agency of Medicines and Health Products (AEMPS): http://www.aemps.gob.es/