IMPORTANT SYNTHROID WARNING:
| Thyroid hormone should not be used to treat obesity in patients with normal thyroid function.
Levothyroxine (Synthroid) is ineffective for weight reduction in normal thyroid patients and may cause serious or life-threatening toxicity, especially when taken with amphetamines. Talk to your doctor about the potential risks associated with
Synthroid. |
Why is Synthroid prescribed?
Levothyroxine (Synthroid), a thyroid hormone, is used to treat hypothyroidism, a condition where the thyroid gland does not produce enough thyroid hormone. Without
Synthroid, the body cannot function properly, resulting in poor growth, slow speech, lack of energy, weight gain, hair loss, dry thick skin, and increased sensitivity to cold. When taken correctly,
Levothyroxine (Synthroid) reverses these symptoms. Levothyroxine (Synthroid) also is used to treat congenital hypothyroidism (cretinism) and goiter (enlarged thyroid gland).
Synthroid is sometimes prescribed for other uses; ask your doctor or pharmacist for more
Synthroid information.
How should Synthroid be used?
Levothyroxine (Synthroid) comes as a tablet to take by mouth.
Synthroid usually is taken as a single Synthroid dose before breakfast every day. To control the symptoms of hypothyroidism, you probably will need to take
Synthroid for the rest of your life. It may take about 2 weeks before you notice any change in your symptoms. Follow the
Synthroid directions on your Synthroid prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take
Levothyroxine (Synthroid) exactly as directed. Do not take more or less Synthroid
or take Synthroid more often than prescribed by your doctor.
Continue to take Levothyroxine (Synthroid) even if you feel well. Do not stop taking
Levothyroxine (Synthroid) without talking to your doctor.
What special Synthroid precautions should I follow?
Before taking Levothyroxine (Synthroid),
- tell your doctor and pharmacist if you are allergic to Levothyroxine (Synthroid), thyroid hormone, any other drugs, povidone iodine, tartrazine (a yellow dye in some processed foods and drugs), or foods such as lactose or corn starch. Levothroid and Eltroxin contain lactose, while Synthroid contains tartrazine and povidone. Eltroxin contains corn starch.
- tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially amphetamines; antacids; anticoagulants (blood thinners) such as warfarin (Coumadin); antidepressants or anti-anxiety agents; arthritis medicine; aspirin; beta-blockers such as metoprolol (Lopressor, Toprol), propranolol (Inderal) or timolol (Blocadren, Timoptic); cancer chemotherapy agents; cholesterol-lowering resins such as cholestyramine (Questran) or colestipol (Colestid); diabetes medications (insulin and tablets); digoxin (Lanoxin); estrogens; iron; methadone; oral contraceptives; phenytoin (Dilantin); sodium polystrene sulfonate (Kayexalate); sucralfate (Carafate); steroids; theophylline (TheoDur); and vitamins.
- if you take cholestyramine (Questran) or colestipol (Colestid), take it at least 4 hours before or 1 hour after taking
Levothyroxine (Synthroid).
- tell your doctor if you have or have ever had diabetes; hardening of the arteries (atherosclerosis); kidney disease; hepatitis; cardiovascular disease such as high blood pressure, chest pain (angina), arrhythmias, or heart attack; or an underactive adrenal or pituitary gland.
- tell your doctor if you are pregnant, plan to become pregnant or are breast-feeding. If you become pregnant while taking
Levothyroxine (Synthroid), call your doctor.
- if you have surgery, including dental surgery, tell the doctor or dentist that you are taking
Levothyroxine (Synthroid).
What special Synthroid dietary instructions should I follow?
Levothyroxine (Synthroid) may cause an upset stomach. Take Levothyroxine (Synthroid)
with food or milk.
What should I do if I forget a Synthroid dose?
Take the missed Synthroid dose as soon as you remember it. However, if it is almost time for the next
Synthroid dose, skip the missed Synthroid dose and continue your regular Synthroid
dosing schedule. Do not take a double Synthroid dose to make up for a missed one.
What side effects can Synthroid cause?
Although side effects from Levothyroxine (Synthroid) are not common, they can occur. Tell your doctor if any of these
Synthroid symptoms are severe or do not go away:
- weight loss
- tremor
- headache
- upset stomach
- vomiting
- diarrhea
- stomach cramps
- nervousness
- irritability
- insomnia
- excessive sweating
- increased appetite
- fever
- changes in menstrual cycle
- sensitivity to heat
- temporary hair loss, particularly in children during the first month of therapy
If you experience either of the following Synthroid symptoms, call your doctor immediately:
- chest pain (angina)
- rapid or irregular heartbeat or pulse
What storage conditions are needed for Synthroid?
Keep Synthroid in the container it came in, tightly closed, and out of reach of children. Store
Synthroid at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any
Synthroid that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your
Synthroid.
In case of Synthroid emergency/overdose
In case of Synthroid overdose, call your local poison control
center at 1-800-222-1222. If the victim has collapsed
or is not breathing, call local emergency services at
911.
What other Synthroid information should I know?
Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests to check your response to
Levothyroxine (Synthroid).
Learn the brand name and generic name of Synthroid. Do not switch
Synthroid brands without talking to your doctor or pharmacist, as each brand of Levothyroxine (Synthroid)
contains a slightly different amount of medication.
Do not let anyone else take your Synthroid. Ask your pharmacist any
Synthroid questions you have about refilling your Synthroid prescription.
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