Drugs Home > Levoxyl Side Effects

Even though most people do not experience problems when taking Levoxyl, side effects are possible. Some common side effects include insomnia, hair loss, and difficulty breathing. Side effects typically occur when your dosage is too high. Because many side effects of the drug can be dangerous, it is important to contact your healthcare provider right away if you develop any problems.

An Introduction to Levoxyl Side Effects

As with any medicine, side effects are possible with Levoxyl® (levothyroxine sodium). However, not everyone who takes the drug will have problems. In fact, most people tolerate it quite well.
(This article covers many, but not all, of the possible side effects with Levoxyl. Your healthcare provider can discuss a more complete list of Levoxyl side effects with you.)

Possible Side Effects of Levoxyl

Side effects typically occur when the Levoxyl dosage is too high. Too much Levoxyl 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 dosage needs to be decreased. These Levoxyl side effects may include:
As with any medication, Levoxyl can also cause allergic reactions. Seek medical attention immediately if you develop signs of an allergic reaction, such as:
  • An unexplained rash
  • Hives
  • Itching
  • Wheezing or difficulty breathing
  • Unexplained swelling (especially of the lips, mouth, or throat).
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
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