synthroidSynthroid is a synthetic version of a hormone usually produced by the thyroid gland. The active ingredient in Synthroid is levothyroxine sodium which is formulated as oral tablets.

Drug Uses

Synthroid is available by prescription only. Synthroid is used to regulate the body’s metabolism when the thyroid gland is dysfunctional. Synthroid is also used to prevent goiters (enlarged thyroid gland) which can occur as a result of hormone imbalance, surgery, cancer, or radiation treatment.

Doctors prescribe Synthroid for other medical conditions.


Synthroid should be taken as prescribed by a doctor. Synthroid does not have to be taken with food. Never increase or decrease the dose without consulting a doctor. Synthroid should be taken in the morning with a full glass of water to prevent the tablet from dissolving and swelling in the throat.

Do not suddenly stop taking Synthroid even if you are feeling fine. You will need to use Synthroid continuously to stay healthy.

While using Synthroid you will need to have regular blood tests to ensure that the medication is working correctly.

Missed Dose

If a dose is missed, it can be taken as soon as you remember, as long as it does not clash with the next scheduled dose. In this case, rather skip the missed dose. Never take a double dose.


Do not take Synthroid if you are allergic to levothyroxine.

Do not use Synthroid if you have a thyroid disorder called thyrotoxicosis, or an untreated adrenal gland disorder, or if you have had a heart attack.

Synthroid is not expected to harm an unborn fetus, therefore it is safe for pregnant women to use this drug. Although Synthroid is passed into breast milk, it is not expected to harm a baby. If you fall pregnant while using Synthroid inform your doctor because your dosage may need adjusting.

Ensure that your doctor has a full knowledge of your medical history, including any other medications you are using. These include vitamin supplements, herbal medicines and over-the-counter remedies. Synthroid can react badly with certain medications.

Synthroid is usually prescribed for life. Long-term use can cause bone loss that can lead to osteoporosis. Speak to your doctor about this.


Call for emergency medical assistance if any of the following allergic symptoms occur: difficulty in breathing, hives, or swelling of the lips, face, tongue or throat.

Contact your doctor if you have any of the following serious side-effects: insomnia, headache, nervousness, irritability, hot flashes, sweating, changes in the menstrual cycle, change in appetite, or weight changes.

Less serious side-effects may include mild hair loss.

This is not a complete list of side effects. If any other uncomfortable symptoms occur and persist, contact your doctor.


If overdose with Synthroid is suspected, get emergency assistance immediately. Symptoms of overdose include pounding heart, chest pain, shortness of breath, tremors, confusion, leg cramps, vomiting, diarrhea, or convulsions.


Synthroid should be kept in a cool, dry place away from sun and moisture. Keep Synthroid out of the reach of children.


Important information about Synthroid

Synthroid is considered a good drug for the treatment of low thyroid activity. Apart from this, the drug is also prescribed with other drugs for certain kinds of thyroid cancer. The drug also treats and prevents goiter, caused by radiation treatment, hormone imbalances or surgery.

The drug should be taken as per your doctor’s direction. You should not take larger amounts of the drug or less or take the drug for prolonged periods. The drug should be taken on empty stomach or should be taken three to four hours after food. If you have difficulty in swallowing Synthroid, the drug can be crushed and taken with water.

You can see the impact of the drug only within a few weeks. But you should not stop the drug in between a course as it can only enhance the risks. Coming to the dosages, never miss any doses. Always take care that the doses are taken at the right time every day. But if you miss any dosage, it can be taken once you remember it. You should also not mix any two doses as it can be dangerous. Coming to overdose, you should see immediate medical help if you suspect an overdose. Chest pain, fast heartbeat, shortness of breath, tremor, leg cramps, seizures, vomiting and diarrhea are some of the symptoms of Synthroid overdose.

Before the doctor administers Synthroid, you should have to tell him about all your allergic reactions and also your entire health conditions. You should have to tell the doctor if you have any allergies to any particular substance, medicine or food. Do not hesitate to inform you doctor if you have coronary artery disease, diabetes, heart disease, anemia, pituitary or adrenal gland problems and blood clots. Well, if you are using insulin or taking any diabetic medicine, you should have to discuss with your doctor as he may sometimes go for dosage regulations.

Synthroid is not normally prescribed if you have adrenal problem, a thyroid disorder called thyrotoxicosis and heart attack. When taking the drug, you should have to avoid certain foods like soy formula, walnuts, cottonseed meal and high fiber foods as these could slow down the absorption of the drug into the blood. You should also not change the brands unless your doctor wants it.

Synthroid is also known to interact with certain medicines. Therefore, you should have to inform your doctor about all the medications that you are taking before he prescribes the drug. Tell the doctor if you are using lithium, amiodarone or antidepressants. It is advised to take calcium carbonate drugs, iron supplements, sucralfate, sodium polystyrene sulfonate, antacids that contain aluminum and cholesterol-lowering drugs four hours after or before taking Synthroid.

You should have to stop taking Synthroid if you come across allergic reactions like rashes, breathing problems and swelling of lips, face, tongue or throat. He other serious side effects that come with the drug include fever, headache, sweating, insomnia, nervous feelings, hot flashes, changes in menstrual periods and weight changes.