Levothroid Side Effects

Typically, side effects of Levothroid occur when your dosage is too high. Possible side effects can include hyperactivity, insomnia, and hair loss, among others. You should also seek immediate medical attention if you develop any signs of an allergic reaction, such as difficulty breathing or an unexplained rash.

Levothroid Medication Information

An Introduction to Levothroid Side Effects

As with any medicine, side effects are possible with Levothroid^® (levothyroxine sodium). However, not everyone who takes the drug will experience side effects. In fact, most people tolerate it quite well.

(This article covers many, but not all, of the possible side effects with Levothroid. Your healthcare provider can discuss a more complete list of side effects with you.)

Possible Side Effects of Levothroid

Side effects typically occur when the Levothroid dosage is too high. Too much Levothroid causes symptoms of an overactive thyroid (known medically as hyperthyroidism). These symptoms can be dangerous, and any of these symptoms should be reported to your healthcare provider (as they may signal that your Levothroid dosage needs to be decreased). These side effects may include:

Feeling hot all the time and increased sweating
Fever
Hyperactivity, nervousness, anxiety, or irritability
High blood pressure (hypertension)
Insomnia (see Levothroid and Insomnia)
Broken bones or other signs of weakened bones
Menstrual problems or fertility problems
Shakiness (tremors) or muscle weakness
Heart palpitations
Emotional changes
Hair loss (see Levothroid and Hair Loss)
Flushing
A rapid heart rate (tachycardia)
Heart failure, chest pain, or a heart attack
Difficult or painful breathing
An increased appetite, along with weight loss
Diarrhea, vomiting, or abdominal cramps (stomach cramps)
Seizures.

As with any medication, Levothroid can also cause allergic reactions. Seek medical attention immediately if you develop signs of an allergic reaction, including:

An unexplained rash or hives
Itching
Wheezing or difficulty breathing
Unexplained swelling (especially of the lips, mouth, or throat).

(Levothroid Side Effects Continued: Page 2)