Levothyroxine (Synthroid)
$0.50
Synthroid contains Levothyroxine and replaces thyroid hormone in an underactive thyroid, restoring normal energy and metabolism.
Drug Information
5 reviews for Levothyroxine (Synthroid)
Synthroid contains Levothyroxine.
Levothyroxine is a man-made form of thyroxine, the main hormone made by the thyroid gland. It is used when your thyroid does not make enough hormone (an underactive thyroid, or hypothyroidism).
Thyroid hormone controls how fast your body uses energy. Too little can make you tired, cold, gain weight, and feel low. Levothyroxine replaces the missing hormone so you feel like yourself again. Most people need it for life.
What is it used for?
- Underactive thyroid (hypothyroidism)
- After thyroid surgery or radioactive iodine treatment
- Some types of goitre and thyroid cancer
How does it work?
Levothyroxine works exactly like your own thyroid hormone. It restores normal levels, which helps your body's metabolism, energy, heart rate and temperature return to normal.
This information is written in simple words to help you understand this product. It does not replace advice from your doctor or pharmacist.
Read these points before you start. If any of them apply to you, talk to your doctor or pharmacist first.
- Tell your doctor if you have heart disease, high blood pressure, diabetes, or adrenal gland problems. Your doctor may start with a low dose.
- Calcium, iron, antacids, some cholesterol medicines and soy can stop levothyroxine being absorbed. Take them at least 4 hours apart.
- Always use the same brand if possible. Switching can change your hormone levels.
- It must not be used to lose weight. High doses can be dangerous.
- If you become pregnant, tell your doctor straight away. You will probably need a higher dose.
- Tell your doctor or pharmacist about every other medicine, vitamin or herbal product you use.
- Keep this product out of the reach and sight of children.
Like all medicines, Synthroid can cause side effects, but not everybody gets them.
Common side effects
- Usually no side effects when the dose is right
- Signs the dose is too high: fast heartbeat, feeling shaky, anxious or hot, trouble sleeping, weight loss, diarrhoea
- Temporary hair thinning in the first months (usually in children)
These are usually mild and often get better as your body gets used to it. Tell your doctor if they bother you or do not go away.
Stop using it and get medical help straight away if you notice:
- Chest pain, a fast or uneven heartbeat
- Severe headache, shaking or feeling very anxious and hot
- Signs of an allergic reaction
This is not a complete list. If you notice anything unusual, ask your doctor or pharmacist.
- Take it once a day, in the morning, on an empty stomach, 30 to 60 minutes before breakfast (or at bedtime, at least 3 hours after your last meal).
- Swallow the tablet with a glass of water.
- Your dose is based on blood tests (TSH). A common adult dose is 50 micrograms to 150 micrograms a day.
- It takes about 6 to 8 weeks for a dose change to have its full effect. Your doctor will check your blood then.
If you miss a dose: Take it as soon as you remember the same day. If you only remember the next day, skip it. Never take two doses at once.
If you use too much: Contact your doctor, a poison control centre or your local emergency number straight away, even if you feel fine. Take the pack with you.
How to store it: Keep it in its original pack at room temperature (below 25°C / 77°F), away from heat, damp and direct sunlight. Do not use it after the expiry date.
- QHow long does Synthroid take to work?
- A
You may start to feel better in 1 to 2 weeks, but it can take a few months to feel fully well.
- QWill I need Synthroid forever?
- A
For most people with an underactive thyroid, yes.
- QCan I take Synthroid with coffee?
- A
Coffee can reduce absorption. Wait 30 to 60 minutes after taking your tablet.
- QWhy do I need blood tests on Synthroid?
- A
They show whether your dose is right. You may need tests every 6 to 8 weeks at first, then once a year.

Irina Iyer –
My experience with this order was good. It came well wrapped and in perfect condition. The confirmation emails were clear and arrived quickly.
Elena Mahmoud –
I placed my first order here and it went smoothly. Prices here are easy on the pocket. I had no issues with what I received. Pleased with the whole thing.
Layla Malhotra –
Tried this site for the first time and had a good experience. Shipping was fast for me. Live chat was handy and the answers were useful. Payment went through smoothly on the first try. Good place to order Synthroid online.
Louis Mahmoud –
I used this site for my latest order and had no problems. Ordering Synthroid took only a few minutes. On top of that, the quantity was right and everything was accounted for.
Noah Bailey –
Quick review of my recent order. The delivery took about as long as I was told. Would recommend this site to anyone looking for Levothyroxine.