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Synthroid Patient Information including If I Miss a Dose
In this Article
- What is levothyroxine (Synthroid)?
- What are the possible side effects of levothyroxine (Synthroid)?
- What is the most important information I should know about levothyroxine (Synthroid)?
- What should I discuss with my healthcare provider before taking levothyroxine (Synthroid)?
- How should I take levothyroxine (Synthroid)?
- What happens if I miss a dose (Synthroid)?
- What happens if I overdose (Synthroid)?
- What should I avoid while taking levothyroxine (Synthroid)?
- What other drugs will affect levothyroxine (Synthroid)?
- Where can I get more information?
What happens if I miss a dose (Synthroid)?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose (Synthroid)?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
Overdose symptoms may include chest pain, pounding heartbeats, tremors, shortness of breath, leg cramps, confusion, vomiting, diarrhea, or seizures.
What should I avoid while taking levothyroxine (Synthroid)?
Certain medicines can make levothyroxine less effective if taken at the same time. If you use any of the following drugs, avoid taking them within 4 hours before or 4 hours after you take levothyroxine:
- calcium carbonate (Caltrate, Citracal, Oystercal, and others);
- ferrous sulfate iron supplement;
- sucralfate (Carafate);
- sodium polystyrene sulfonate (Kayexalate, Kionex, and others);
- antacids that contain aluminum or magnesium (such as Acid Gone, Aldroxicon, Alternagel, Di-Gel, Gaviscon, Gelusil, Genaton, Maalox, Maldroxal, Milk of Magnesia, Mintox, Mylagen, Mylanta, Pepcid Complete, Rolaids, Rulox); or
- cholesterol-lowering drugs cholestyramine (Questran) and colestipol (Colestid).
Do not change brands or change to a generic levothyroxine drug product without first asking your doctor. Different brands of levothyroxine may not work the same. If you get a prescription refill and your new pills look different, talk with your pharmacist or doctor.
Avoid the following food products, which can make your body absorb less levothyroxine: infant soy formula, cotton seed meal, walnuts, and high-fiber foods.
What other drugs will affect levothyroxine (Synthroid)?
Many other medicines can be affected by your thyroid hormone levels. Other medicine may also increase or decrease the effects of levothyroxine.
Many drugs can interact with levothyroxine and not all possible interactions are listed in this medication guide.
Tell your doctor about all medications you use, start using, or stop using during your treatment with levothyroxine. This includes prescription, over-the-counter, vitamin, and herbal products. Give a list of all your medicines to any healthcare provider who treats you.
Where can I get more information?
Your pharmacist can provide more information about levothyroxine.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
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Additional Synthroid Information
- Synthroid Drug Interactions Center: levothyroxine oral
- Synthroid Side Effects Center
- Synthroid Overview including Precautions
- Synthroid FDA Approved Prescribing Information including Dosage
Synthroid - User Reviews
Synthroid User Reviews
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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