Synthroid Inj
In Depth
- Uses and How to Use
- Dosage and Storage
- Precautions and Side Effects
- Drug Interactions
- Drug Images
Pronounced: (lev-oh-thigh-ROX in)
Synthroid Inj Warning
This medication should not be used for weight loss. Normal doses of this medication will not cause weight loss in people with normal thyroid function. Large doses of this medication may cause very serious (possibly fatal) side effects, especially when taken with diet pills.
Synthroid Inj Side Effects
Some hair loss may occur during the first few months of starting this drug. This effect is usually temporary as your body adjusts to this medication. If this effect persists or worsens, tell your doctor or pharmacist promptly.
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Though unlikely, it is possible to have too much thyroid hormone. Your doctor may need to reduce the dose of this medication. Tell your doctor immediately if any of these unlikely but serious signs of too much thyroid hormone occur:
- headache
- mental/mood changes (e.g., nervousness, irritability)
- shaking
- sweating
- sensitivity to heat
- diarrhea
- weight loss
- trouble sleeping
- tiredness
Seek immediate medical attention if any of these rare but very serious side effects occur:
- chest pain
- shortness of breath
- fast/pounding/irregular heartbeat
- swelling of the hands/feet
- seizures
A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:
- rash
- itching
- swelling
- severe dizziness
- trouble breathing
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
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