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Doctor insights on: Why Does Your Appetite Change When Using Synthroid

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Dr. David Sneid
1,403 doctors shared insights

Thyroxine (Definition)

Thyroxine is a thyroid ...Read more


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I know that Synthroid (thyroxine) is used for hypothyroidism but can it be used to increase appetite in people who eat too little?

No: It should not be used as an appetite stimulant. It will lead to more side effects, and actually suppress your own body hormone, which you may have enough. Extra thyroid hormone will increase your metabolism, your heart rate (leading to possible arrhythmias) and weight loss, diarrhea. Other medications are available as appetite stimulants. ...Read more

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Haven't had much appetite and had little nausea and lost a few lbs since total thyroidectomy 1 wk ago. Can this happen. On synthroid (thyroxine).?

Haven't had much appetite and had little nausea and lost a few lbs since total thyroidectomy 1 wk ago.  Can this happen. On synthroid (thyroxine).?

Synthroid (thyroxine): Synthroid (thyroxine) could cause this; however, it is unlikely since you've only been taking it for a week -- with the exception of the nausea. The anesthesia used for surgery may have some effect. In addition, your body is healing from the surgery and the release of certain hormones may be involve in this as well. Other medication may also contribute ( ie: post surgery antibiotics). ...Read more

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Recently dx w/ hypothyroid. Started Synthroid (thyroxine) ~2-3 weeks ago & noticing increased appetite / feeling more hungry than normal. Could this be from that?

Recently dx w/ hypothyroid. Started Synthroid (thyroxine) ~2-3 weeks ago & noticing increased appetite / feeling more hungry than normal. Could this be from that?

HYPOTHYROIDISM: Potentially, HYPOTHYROIDISM can cause a myriad of symptoms. In women it can cause dysfunctional uterine bleeding resulting in a secondary anemia. It also may be associated with anemIa of chronic disease. Get your levels checked regularly and follow up with your doctor. You need to have labs rechecked and may need a higher dose. ...Read more

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Can a doctor prescribe Synthroid (thyroxine) to increase a patient's appetite?

Not wise: That would not be a good idea. A high dose of synthroid (thyroxine) would increase metabolic rate (and put a stress on the heart) and appetite may/may not go up, but usually it would cause weight loss. Synthroid (thyroxine) should only be prescribed for hypothyroidism, or other clear thyroid related conditions, and should not be used for obesity or appetite. ...Read more

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Joint pain throughout body, can't sleep more 2-4 hr weight gain lack appetite on Synthroid (thyroxine) .75 TSH 3.17@nite pain wake me up.Otc pain med no good?

Joint pain throughout body, can't sleep more 2-4 hr weight gain lack appetite on Synthroid (thyroxine) .75 TSH 3.17@nite pain wake me up.Otc pain med no good?

You need a medical e: A medical exam is what you need. Please go see your primary care doctor and let him/her examine you and find out what is wrong. At your age there is high risk of serious medical ailments which can cause bone pains. Only an examination and check of blood tests and x-ray check ups can help to make a correct diagnosis. ...Read more

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Can I change from taking synthroid (thyroxine) at night vs the morning? I take 50 mcg.

Can I change from taking synthroid (thyroxine) at night vs the morning?  I take 50 mcg.

Either: It is usually recommended that you take the medicine in the morning about an hour before eating. Fasting prior to the dose appears to be more important than whether it is taken in the morning or in the evening. Therefore nighttime is also fine. Hope this helps. ...Read more

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Do thyroid levels change as a person ages? Does everyone eventually need synthroid (thyroxine)?

Do thyroid levels change as a person ages? Does everyone eventually need synthroid (thyroxine)?

Thyroid needs : Do change as we get older. However, not everyone will need thyroid supplementation. ...Read more

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How long does Synthroid (thyroxine) dosage change take to work? I'm 13w pregnant & just found out it's way too low so I'm worried I'll misscarry.

How long does Synthroid (thyroxine) dosage change take to work? I'm 13w pregnant & just found out it's way too low so I'm worried I'll misscarry.

Thyroid: No need to worry. Your doctor needs to keep an eye on you as you proceed through pregnancy, changing the dose as needed. You and baby will be fine. Your obstetrician will look after you as well. ...Read more

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My daughter was changed from 100 mcg eltroxin to 88mcg Synthroid (thyroxine) she's on day 3 of the new meds and not feeling well. Can this be a change in brand?

My daughter was changed from 100 mcg eltroxin to 88mcg Synthroid (thyroxine) she's on day 3 of the new meds and not feeling well.  Can this be a change in brand?

Too short of time: Changing to a slightly lower dose will take time to stabilize thyroid hormone levels. I doubt whether 3 days would be sufficient to change levels that drastically for your child to have symptoms. There is also a strong possibility that she may be having symptoms from something else. It is hard to tell since your child's symptoms were not mentione. Please have her checked out by her physician. ...Read more

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I've been taking Synthroid (thyroxine) for three months for hypothyroidism and i still have can't tell no changes in my health wonder why?

I've been taking Synthroid (thyroxine) for three months for hypothyroidism and i still have can't tell no changes in my health wonder why?

Be patient: Thyroid disorders can take months to get regulated. You may need a TSH lab test to see how your thryoid is doing, and medication may need to be adjusted. Symptoms may take even longer to regulate as your body gets used to the new "regulation.". ...Read more

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Apparently I am not converting Synthroid (thyroxine) T4 into enough t3. Why? How do I change this?

Apparently I am not converting Synthroid (thyroxine) T4 into enough t3. Why? How do I change this?

Desiccated thyroid: Dessicated thyroid such as Armour Thyroid may be the better med choice for you. Check free T3 and reverse t3. Ft3 should be in upper range and rt3 in lower range. If your ratio is off, you may need Armour Thyroid or t3, and synthroid (thyroxine) would be the wrong med for you. ...Read more

Dr. Joseph Mathews
607 doctors shared insights

Synthroid (Definition)

Synthroid is a thyroid ...Read more