Product Informationexpand all collapse all
Levothyroxine is a replacement for a hormone that is normally produced by your thyroid gland to regulate the body's energy and metabolism. Levothyroxine is given when the thyroid does not produce enough of this hormone on its own.
Levothyroxine treats hypothyroidism (low thyroid hormone). Levothyroxine is also used to treat or prevent goiter (enlarged thyroid gland), which can be caused by hormone imbalances, radiation treatment, surgery, or cancer.
How to take
Take Synthroid as a single dose, preferably on an empty stomach, one-half to one hour before breakfast. The drug is absorbed better on an empty stomach. If an infant or child cannot swallow whole tablets, you may crush a Synthroid tablet and mix it into 1 or 2 teaspoonfuls of water.
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have a serious side effect such as:
- sleep problems (insomnia);
- feeling nervous or irritable;
- fever, hot flashes, sweating;
- pounding heartbeats or fluttering in your chest;
- changes in your menstrual periods; or
- appetite changes, weight changes.
Less serious side effects may include mild hair loss. This is not a complete list of side effects and others may occur.
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).
Jake F., 45, Illinos Standard ED Pack (Generic)
“My ED was giving me nightmares! Yes, I could use Viagra but it was too expensive to buy all the time. That’s why I ordered a generic version at Canadian Pharmacy and could not be happier with the results.”
Janine L., 35, Winnipeg Albuterol
“What I like most about this pharmacy is that they deliver very fast and always package it securely so no one knows what I ordered. It is a big deal for someone who has very nosy neighbours.”
Sandra S., 41, Edinburgh Zyban (Generic)
“It is nice and affordable to buy meds here. I only needed some pills to stop smoking, but I can see they have lots of offers in other categories too. I think I found a perfect pharmacy for my needs.”
Dave M., 28, Oslo Zithromax (Generic)
“I have bought a lot of medications at this pharmacy and I can tell they only sell quality stuff. Trusted and safe generics and the prices are rather low. A perfect price-quality combination!”
Erin F., 61, Sydney Xanax (Generic)
“During my treatment, I was prescribed a lot of costly medications not covered with insurance. Would’ve never been able to afford them if not for this amazing pharmacy.”
Jacob, 35, Ottawa Prozac (Generic)
"I just love how I can order from home and then get my items delivered for free. No lines, no prescriptions, it’s just like Amazon for pills!”