Synthroid (levothyroxine): Uses, Dosage & Side Effects

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Synthroid (levothyroxine) it is a replacement hormone produced normally by the thyroid gland to regulate the metabolism and body energy. It is going when the body doesn’t produce enough hormone by its own.

It is mainly used to treat hypothyroidism( low thyroid hormone), it is used to prevent goiter ( enlarged thyroid gland) it can cause hormonal imbalance .

Information about Synthroid:

This medication is not to be taken if you have untreated adrenal gland disorder, or if have any recent heart attacks. It can be used as the exactly how the doctor has prescribed, directions written on the prescription label should be followed by the patient. It is not to be used in small or large doses and also no longer than prescribed.

It is not to be used to treat obesity. Dangerous side effects or sometimes death occur by misuse of this drug.

Dosage pattern of Synthroid:

Adult dose:


It is about 1.7mcg/kg/day and older patients may require less than 1mcg/kg/day.

For older patients older than 50yrs :

Initial dose: 25-50mcg/day, and gradually increased at 6-8 weeks as needed

Severe hypothyroidism:

It is about 12.5-25mcg/day with increase of 25mcg/day every 2-4weeks


It is about 10-15mcg/kg/day , a lower starting is considered in infants because at risk for cardiac failure

Infants and children:

It is about initial dose is 25mcg/day and the recommended increment is 25mcg for every 2-4weeks until the desired effects are achieved.

Synthroid overdose:

The overdose of this drug may be fatal , seek immediate medical emergency

Symptoms of overdose:

  • Confusion
  • Loss of consciousness
  • Headache
  • Slurred speech
  • Disorientation
  • Lightheadedness
  • Weak pulse

Synthroid side effects:

Severity: major

  • Crying
  • Diarrhea
  • Fear
  • Feeling of discomfort
  • Hair loss
  • Increased appetite
  • Abdominal pain
  • Feeling unhappy
  • Mental depression
  • Restlessness
  • Nervousness
  • Vomiting
  • Weight gain
  • Muscle weakness
  • Weight loss
  • Trouble getting pregnant
  • Rapid mood swings
  • Redness of the face and hands

Synthroid (levothyroxine):

  • Levoxyl
  • Levothroid
  • Unithroid
  • Tirosint


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