Levothyroxine and Hair Loss
Hair loss is a possible side effect of levothyroxine; however, it is not known how many people experience this side effect. If you are taking levothyroxine and hair loss occurs, be sure to discuss your treatment options with your healthcare provider.
Levothyroxine sodium is a prescription medication used to treat an underactive thyroid (hypothyroidism). Hair loss appears to be a possible (though uncommon) levothyroxine side effect. However, the exact percentage of people who develop this side effect has not been reported (as is common with older medications, like levothyroxine).
Usually, hair loss is a temporary side effect that improves within the first few months of taking levothyroxine. However, it can also be a sign that you are getting too much levothyroxine. Taking too much levothyroxine causes hyperthyroidism symptoms, including hair loss.
Confusingly, hair loss can also be a sign of hypothyroidism (which may mean that your levothyroxine dosage is too low). Keep in mind that it is also possible that your hair loss is completely unrelated to levothyroxine.