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Eltroxin, known generically as Levothyroxine, is used to treat hypothyroidism. The thyroid gland naturally produces a hormone named Thyroxine (T4). Levothyroxine is a synthetic version of this hormone. Eltroxin is a thyroid hormone supplement prescribed to patients whose thyroid gland does not produce enough thyroid hormone.
Eltroxin replaces the thyroxine that your thyroid gland cannot produce and prevents the symptoms of hypothyroidism. Eltroxin is also used to treat other disorders, such as thyroid cancer or goiter (enlargement of the thyroid gland)
By regulating the level of the thyroid hormone (T4) in the body, Eltroxin helps increase the basal metabolic rate and relieves the symptoms of hypothyroidism, which may include the following:
- Tiredness
- Constipation
- Dry skin
- Weight gain
- Puffy face
- Hoarse voice
- Coarse hair and skin
- Muscle weakness
- Muscle aches, tenderness, and stiffness
- Thinning hair
- Slowed heart rate, also called bradycardia
- Depression
- Memory problems
Eltroxin Medication Table
| Usage | Treats hypothyroidism by restoring normal levels of thyroxine (T4). |
| Mechanism of Action | Synthetic T4 hormone that normalizes metabolism, energy, and hormone levels. |
| Administration Method | Oral tablet, taken once daily 30–60 minutes before breakfast. Swallow whole with water. |
| Black Box Warning | Not for weight loss or obesity treatment. High doses may cause life-threatening effects, especially when combined with diet pills like Rybelsus. |
| Precautions | Use with caution in heart disease, seizures, liver issues, diabetes, or osteoporosis. May impair driving early in treatment. Monitor thyroid levels regularly. Not recommended in pregnancy unless prescribed. |
| Side Effects |
High dose: Chest pain, rapid heartbeat, mood swings, confusion, yellow skin. Low dose: Fatigue, constipation, dry skin, weight gain, weakness. Other: Hair loss, anxiety, swelling, temporary drowsiness. |
| Drug Interactions | Amiodarone, antacids, anticonvulsants, diabetes meds, iron, calcium, estrogens, NSAIDs, PPIs, statins, warfarin, SSRIs, semaglutide, diet pills. |
| Strengths & Dosages | Dose varies based on T4 blood levels. Taken once daily. Tablets come in multiple strengths (25–200 mcg). |
| Missed Dose | Take as soon as remembered. Skip if near next dose. Do not double dose. |
| Overdose | May cause fast heartbeat, confusion, chest pain, or fainting. Seek immediate medical help. |
| Alternatives | Armour, Thyroid, Cytomel, Synthroid, Levoxyl, Unithroid, Tirosint. |
Labeled Warnings for Eltroxin
The FDA has given Eltroxin a black box warning. Levothyroxine, like all thyroid hormone drugs, should not be used for weight loss or to treat obesity. High doses have a potentially life-threatening effect, especially when combined with diet pills (such as Rybelsus).
Before taking this medication, inform your doctor about any pre-existing medical conditions, allergies, intolerances, and other medicines you may be taking. Please also notify your doctor if you are pregnant or breastfeeding or if you plan to become pregnant in the next few months.
Precautions of Eltroxin
Before taking this medicine, tell your doctor about any existing medical conditions, allergies, intolerances, and other drugs you may be taking. Please inform your doctor if you are pregnant or breastfeeding or if you are planning to become pregnant in the next few months.
Additionally, you need to monitor the effects of Eltroxin in the following cases:
Heart Disease
Patients with heart disease should start with a lower dosage, as Levothyroxine can put additional stress on the heart. If you are taking heart medication, your doctor should closely monitor your intake of Elroxin.
Seizures
In rare cases, patients may experience seizures at the start of treatment. If you have had seizures in the past, please discuss the use of Eltroxin with your doctor.
Driving, Operating Heavy Machinery
Eltroxin may cause lethargy or impair your ability to drive or operate heavy machinery. Please refrain from doing so until the effects of the medicine have fully adjusted in your body.
Diabetes
Levothyroxine increases blood sugar levels. If you have diabetes, you should monitor your insulin intake closely.
Osteoporosis
If you have suffered from bone densitometry in the past or are taking medication that reduces bone density (e.g., prednisone or antiseizure medications), please discuss the use of Eltroxin with your doctor. Levothyroxine can affect bone density.
How to Use Eltroxin
Take Eltroxin precisely as prescribed. Your doctor will prescribe the dosage based on blood results. Since the dosage that will work for you depends on how much medication is needed to get your body to normal Thyroxine levels, your doctor might request multiple checkups to ensure the correct dosage. Do not share your medicines with others, even if they have the same symptoms.
- Swallow the tablets with plenty of water.
- It would help if you took your tablets once a day, 30 minutes to an hour before breakfast or your first meal.
- Take the medication at the same hour each day.
- For small children or infants who cannot swallow the Eltroxin tablet, you can crush and dissolve it in 5 to 10 ML of water, milk, or non-soybean formula.
- Do not store tablets after crushing them or mixing them with liquid.
- Do not stop taking this medication without talking to your doctor.
- Thyroid replacement therapy is usually for life.
Benefits of Eltroxin
Eltroxin, generically named Levothyroxine, is a synthetic version of a hormone produced naturally by your body called thyroxine (T4). Replacing the thyroxine that your thyroid gland cannot make restores normal hormone levels in your body, relieving hypothyroidism symptoms. Thyroid hormones control your body’s metabolism and energy levels. Once your symptoms improve, you will notice that you are less tired and have more energy. Fatigue, muscle aches, constipation, dry skin, weight gain, slow heartbeat, or sensitivity to cold will be relieved as your T4 levels normalize.
Possible Side Effects
Side effects are rare but may include temporary hair loss. Contact your doctor immediately, even if this occurs while your body adjusts to the new hormone levels.
High Dosage Side Effects
The side effects of being on too high a dosage may include:
- Pain in the chest
- Confusion
- Rapid palpitations
- Mood swings
- Muscle weakness
- Psychosis
- Yellow eyes or skin
- Shortness of breath
Low Dosage Side Effects
Conversely, the side effects of being on a dosage too low are:
- Clumsiness
- Constipation
- Dry, swollen skin,
- Muscle pain
- Drowsiness
- Fatigue
- Weakness
- Weight gain
Drug Interactions of Eltroxin
Eltroxin may interact with some other medications. Please talk to your doctor before stopping or starting a new medication. Tell your doctor about any medications you may be taking so they can decide if it is necessary to make any changes; this applies to both prescribed drugs and over-the-counter products. An interaction between two medications does not mean that you have to stop taking one of them.
There might be other medications not listed that interact with Eltroxin.
- Amiodarone
- Antacids (e.g., aluminum hydroxide, calcium carbonate, magnesium hydroxide)
- Anticonvulsants (e.g., carbamazepine, phenytoin, phenobarbital)
- Apalutamide
- Beta-blockers (e.g., metoprolol, propranolol)
- Birth control pills containing estrogen
- Calcium carbonate
- Calcium polystyrene sulfonate
- Chloroquine
- Cholestyramine
- Ciprofloxacin
- Colesevelam
- Colestipol
- Corticosteroids (e.g., dexamethasone, hydrocortisone, prednisone)
- Diabetes medications (e.g., glyburide, insulin, metformin, rosiglitazone)
- Diazepam
- Diet pills
- Digoxin
- Estrogens (e.g., conjugated estrogen, estradiol, ethinyl estradiol)
- Furosemide
- Heparin
- Iodide
- Interon-alfa
- Iron supplements (e.g., ferrous fumarate, ferrous gluconate, ferrous sulfate)
- Lithium
- Magnesium supplements (e.g., magnesium hydroxide, magnesium oxide)
- Maprotiline
- Metoclopramide
- Methimazole
- Multivitamins/minerals with iron, folic acid
- Nicotinic acid
- Non-steroidal anti-inflammatory medications (NSAIDs; e.g., diclofenac, ibuprofen, ketorolac, naproxen)
- Octreotide
- Orlistat
- Propylthiouracil
- Proton pump inhibitors (PPIs; e.g., esomeprazole, lansoprazole, omeprazole)
- Raloxifene
- Rifampin
- Ritonavir
- Selective serotonin reuptake inhibitors (SSRIs; e.g., citalopram, fluoxetine, paroxetine, sertraline)
- Semaglutide
- Sevelamer
- Simethicone
- Sodium polystyrene sulfonate
- Somatropin
- Certain statins (e.g., lovastatin, simvastatin)
- Sucralfate
- Testosterone
- Theophyllines (e.g., aminophylline, oxtriphylline, theophylline)
- Tamoxifen
- Thiazide diuretics (e.g., hydrochlorothiazide)
- Tricyclic antidepressants (e.g., amitriptyline, imipramine)
- Warfarin
Eltroxin Alternatives
Some alternatives exist if you are allergic to Eltroxin or cannot take it due to interactions with other medications. Please talk to your doctor before making any changes to your medication.
Armour Thyroid
It is a natural alternative to Levothyroxine, made from porcine (pig) thyroid glands. It contains both thyroxine (T4) and triiodothyronine (T3) and treats the same conditions as Levothyroxine, such as hypothyroidism and thyroid cancer.
Cytomel (Liothyronine)
It is a synthetic version of the T3 hormone instead of the T4 hormone.
Synthroid, Levoxyl, Unithroid, and Tirosint are other brands of Levothyroxine.
FAQ for Eltroxin
What is Eltroxin used for?
Eltroxin is a brand name for the drug levothyroxine. It treats hypothyroidism, which occurs when the body does not naturally produce the thyroid hormone thyroxine (T4). Eltroxin helps regulate hormone levels in the body and relieves the symptoms of hypothyroidism.
How should I take Eltroxin?
Take Eltroxin as your doctor prescribes. You should take it once daily on an empty stomach, preferably 30 minutes to one hour before your first meal. Eltroxin works best if taken at the same each day. Take it with plenty of water, and do not store crushed tablets or liquid preparations.
What should I do if I miss a dose of Eltroxin?
If you miss a dose, take it as soon as you remember with the following precautions: If it is almost time for your next dose, skip it and continue with your regular schedule. Please remember never to take a double dose to compensate for the missed one. In case of any doubts regarding your dose, contact your doctor or pharmacist. Talk to your doctor beforehand regarding what to do if you forget a dose.
Can Eltroxin be used for weight loss?
In absolutely no circumstances use this medication for weight loss. Eltroxin has a black box warning by the FDA in this regard. High doses have a potentially life-threatening effect, especially when combined with diet pills.
How long does it take for Eltroxin to start working?
Eltroxin starts working immediately. However, restoring your body to normal hormone levels might take a few weeks and adjustment checkups with your doctor.
Are there any foods or supplements I should avoid while taking Eltroxin?
Avoid foods that may interfere with the body’s absorption of Eltroxin, such as whole grains, walnuts, grapefruit juice, soybean products, or cottonseed meal. If you are taking calcium supplements or antacids, take them at least 4 hours before or after Eltroxin. The same goes for foods high in calcium, such as milk, broccoli, or kale.
What are the signs of an overdose of Eltroxin?
Any of the following symptoms might be a sign of a dosage too high or overdose, and you should contact your doctor immediately:
- Pain in the chest
- Confusion
- Rapid palpitations
- Mood swings
- Muscle weakness
- Psychosis
- Yellow eyes or skin
- Shortness of breath
Is it safe to take Eltroxin during pregnancy?
Eltroxin does not present any risks in pregnancy or breastfeeding.
IMPORTANT NOTE: The information provided here is for educational purposes only and is not intended to serve as medical advice, diagnosis, or treatment recommendations. It should not be taken as an endorsement of any specific medication or treatment. Individual health conditions and responses to treatment can vary greatly; therefore, this information should not be seen as a guarantee of safety, suitability, or effectiveness for any particular individual. Always consult with a healthcare professional for personalized medical advice and before making any decisions regarding your health or treatment plans.
