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4RX Store > Medication List > Thyroid drugs > Order Synthroid online

Thyroid Medication (Synthroid)

Generic name:
Brand name:
The drug you may know as Synthroid among other names is based on Levothyroxine. It is a synthetic thyroid hormone prescribed in many diseases associated with thyroid hormones deficiency such as noncancerous thyroid diseases, prophylaxis of goiter after its removal, replacement therapy for underactive thyroid, suppressive therapy for thyroid cancer, addition to the therapy or overactive thyroid, and for the test of thyroid suppression. The medication can be used for adults, kids, and pregnant women. Find out all of the useful information from the article below.
Therapy of benign thyroid diseases, Prophylaxis of relapse after surgical therapy of euthyroid goiter, Replacement therapy for underactive thyroid, Suppressive therapy for thyroid cancer, Adjunct to antithyroid therapy for hyperthyroidism, Test of thyroid suppression
The drug provides the effect identical to the thyroid hormones in their deficiency normalizing body functioning
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Eltroxin, Euthyrox, Laevoxin, Levaxin, Levolet, Levothroid, Levoxine, Levoxyl, Novothyrox, Oroxine, Thyratabs, Thyrax, Thyroxin, Unithroid
Synthroid (Generic Levothyroxine)
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  Generic Medication guide:

What is Eltroxin and when is it used?

The drug sold under the name Synthroid and others is made with the use of Levothyroxine. This substance is a sodium salt of L-thyroxine which is able to act in the body as thyroid hormones. The medication is used for different health conditions when the deficiency of thyroid hormones occurs.

In the majority of cases of the formulation use, it is prescribed for long-term or even life-long use. Thus, to save on the pills, you can buy Synthroid online from our med store. To save even more opt for a generic version of the drug, i.e. the same drug sold under a less known name.

Short drug info
Other names Levothyroxine, Levolet, Thyrax, Thyroxin, Unithroid, Synthroid, others
Routes of administration by mouth, intravenous
Pregnancy category US: A (No risk in human studies)
Legal status US: Rx-only
Bioavailability 40-80%
Metabolism mainly in liver, kidneys, brain and muscles
Elimination half-life ca. 7 days (in hyperthyroidism 3–4 days, in hypothyroidism 9–10 days)
Excretion feces and urine

The formulation is a synthetic derivative of thyroxin. It renders the effects equal to effects of the hormone made by the thyroid gland. In the body organs, it transforms into triiodothyronine and affects the receptors sensitive to this hormone. The synthetic hormone acts identically to the natural hormone.

The effect of the formulation starts to become noticeable in three to five days of use.

When can you buy Synthroid?

Naturally, you should not buy generic Synthroid without being told to do so by your doctor. A doctor can prescribe this drug for:

- Noncancerous thyroid diseases.

- Prophylaxis of recurrence for goiter after its surgical removal.

- Malignant tumor of the thyroid.

- Antithyroid therapy for the overly active thyroid.

- Test of thyroid function.

When shouldn’t you by Synthroid?

There are certain contraindications in which Levothyroxine must not be used:

- Intolerance of the medication manifested in allergic reactions or severe adverse reactions.

- Presence of untreated adrenal or pituitary insufficiency, or thyrotoxicosis.

- Severe heart condition or pancreatitis in the recent past.

- Treatment with thyreostatics during pregnancy.

Use of Synthroid during pregnancy and breastfeeding

Women with underactive thyroid must continue the therapy during pregnancy. Sometimes, the dosages of the medication should be even higher than usual. Consult your doctor about the dosages while pregnant.

If you need to buy generic Levothyroxine for the combination therapy of overactive thyroid, consult a specialist on the dosages because sometimes the treatment is prohibited or the dosages should be adjusted.

When breastfeeding, the drug can also be used.

How should you use Synthroid?

Before you start the therapy, you must get precise instructions from your doctor on how to use this drug. The dosages are chosen individually for every patient because the level of thyroid hormones production is different in everyone. Thus, you need to do all of the appointed tests and follow your doctor’s recommendations strictly.

In general, the treatment is started with a low dosage and then it is increased every two to four weeks till the optimal therapeutic dosage is achieved. The decision about the dosage raise and the optimal dosages are selected by a doctor.

It is crucial to identify and settle for the optimal dosage because if the drug is used in the lower dosages than needed, it doesn’t compensate the deficiency of self-produced hormone.

Special groups of patients

Patients over 65 years of age with severely impaired function of the thyroid should receive the lowest possible dosages and must be observed by a doctor. The recommended dosage is 12.5 mg a day with the raise of the dosage only if the drug is well tolerated every 2-4 weeks by 12.5 mg till the optimal one. Besides, they should undergo regular tests of thyroid function to ensure the comprehensive control over the condition. Time of the tablets use and treatment course duration

Time of the tablets use and treatment course duration

The daily dosage of Synthroid or its analog should be taken half an hour before the first meal. For infants, the daily dose is given 30 minutes prior to the first feeding.

If you order Synthroid to replace the natural hormones after a surgical removal of thyroid, or to prevent goiter after its removal, it must be taken all of your life.

In non-severe goiter, the course is from 6 to 24 months. If no improvement is observed, surgery is appointed.

Dosages of Eltroxin for different conditions


Recommended dosages

(Synthroid, mcg per day)

Noncancerous thyroid diseases 75-200
Prophylaxis of goiter after surgical removal 75-200

 Hypothyroidism in adults

- initial dose;

- maintenance dose

25-50 100-200

Hypothyroidism in children

- initial dose;

- maintenance dose

12,5-50 100-150 mcg/sq.m of the body surface
As an addition to antithyroid therapy for hyperthyroidism. 50-100
Thyroid Cancer Suppressive Therapy 150-300
As a diagnostic tool for the thyroid suppression test

In 4 weeks to the test - 75 mcg a day

In 3 weeks to the test 75 mcg a day

In 2 weeks to the test 150 mcg- 200mcg a day

In 1 week to the test 150 mcg- 200mcg a day

What can happen is you overdose on Synthroid?

An increase in triiodothyronine in the hormone blood tests indicates a chronic overdose. In rare cases, long-term use of high doses can cause heart function impairment. Individuals predisposed to seizures may have them when they take an excessive dosage. The medication can also speed up the metabolism and cause weight loss. In case of a suspected overdose, stop using the drug and do hormone tests.

What are possible adverse effects of Synthroid?

When you order generic Synthroid, you should know that you may develop certain negative effects especially in the case individual high susceptibility or if an increase of the dosage is made with insufficient intervals. The potential symptoms are:

- Irregular or rapid heart rate, pain in the chest, hot flashes.

- Headache, insomnia, anxiety, tremor.

- Vomiting, diarrhea, weight loss.

- Increased sweating, muscle weakness, and spasms.

- Fever, menstrual disorders. In case these or other symptoms develop, the used dosage should be lowered or there should be a break for several days in the medication use. After the symptoms fade, the treatment is continued. In case of allergic reactions including skin rash, edema, and others, stop using the drug and consult your doctor immediately.

Is it possible to combine Synthroid with other medicines?

Before you order Levothyroxine, check with your doctor how can it interact with other medicines you use and whether you need their dosage adjustment. - The thyroid medication may lower the effect of antidiabetic formulations.

- Synthroid potentiates the effect of blood thinners so this combination can result in bleeding especially in patients over 65 years old.

- HIV drugs may can affect the medication’s effectiveness.

- Phenytoin can affect the effect of Synthroid.

- Cholestyramine and colestipol slow down the absorption of Synthroid. - Antacids, Sucralfate, iron and calcium-containing formulations can negatively affect the effect of Synthroid. Synthroid must be used at least two hours before these drugs.

- Sertraline, chloroquine/proguanil lower the effectiveness of Synthroid.

- Medicines that enhance liver enzymes can speed up the washing out of the drug from the body.

- Estrogens lower the effect of Synthroid so the dosage of the drug may be higher. This is an incomplete list of interactions. Consult your doctor if you take any other medicines at the time you need to start using Synthroid.

Special instructions for Synthroid use

- Prior to starting therapy with the drug, severe heart conditions or adrenal insufficiency should be completely treated or in remission.

- If a toxic adenoma is suspected, it should be confirmed or disproved before you order generic Levothyroxine.

- Women in postmenopause should use the medication carefully with regular control over the thyroid function as the drug can induce the development of osteoporosis especially if it is used in high dosages.

- The medication must not be used as a means to weight loss as it doesn’t cause weight loss in people with normally functioning thyroid but can cause the excess of the hormone and severe health conditions.

- When the medication doses are raised, it is important to conduct tests for the hormones levels to avoid chronic overdose which can lead to severe health conditions.

- When the patient is prescribed Synthroid for the first time or as a replacement for another drug, tests for the individual response should be made to chose the optimal dosage and avoid overdosing.

- As the medication has additional substances in the pills, people with rare hereditary intolerance to galactose, fructose, lactase deficiency or malabsorption of glucose or sucrose-isomaltose deficiency must not use Synthroid.

- The medication must be used with caution in diabetes.

Where is it better to buy Synthroid?

The cheapest way to get the medication is to order generic Synthroid from our online drugstore. We sell only the highest quality generic medications that cost several times fewer money than their advertised counterparts. Besides, we sell the drug without Rx so you can additionally save on the visits to your doctor.

To enjoy free shipping, order any medications for $170 per one order. Additionally, you will have bonus pills or a discount on your next orders.

Free prescription
Our doctor prescribes online for free, and there is no doctor’s consultation fee.

Discrete packaging
All orders arrive in discrete unmarked parcels. We leave the shipment description blank.

For more answers see the FAQ section


Product Reviews:

Jun / 10 / 2021 Rachel Creek   USA, Dallas
  There was a small delay but still the order arrived.
May / 29 / 2018 Michele Lucas   USA, Wyoming
  Excellent service and received very fast, definitely do business with you again
Mar / 08 / 2018 Pamela Irving   USA, Aurora
  Arrived very quickly & as described thanks

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