L’hypothyroidism is a disease that cannot be cured, but is controlled very well by taking daily thyroid replacement hormones (or substitution). The hormone intake helps to compensate for the poor functioning of the thyroid and to restore a normal metabolism.

The most prescribed synthetic hormone is thyroxine (T4) in the form of levothyroxine sodium tablet (Levothyrox®, Novothyral®, Levothyroid® or Synthroid®). Most people will need to take it daily for the rest of their lives. This medicine corrects symptoms of hypothyroidism in adults within a few weeks. In the elderly or those with heart problems, the delay may be longer, as the doses are increased very gradually to protect the heart.

In the body, some of the T4 hormones are converted into triiodothyronine (T3). Therefore, it is usually not necessary to take T3 therapy in addition to levothyroxine. Exceptionally, however, the doctor may prescribe T3 in combination with T4, usually for temporary treatment.

Un medical monitoring (including a blood test) usually takes place a few months after starting treatment and then annually or if there are signs of hypo or hyperthyroidism. It checks that the administered dose is still suitable for the body’s needs. Thyroid hormone requirements may vary depending on age, disease progression, and other factors, such as pregnancy.

In the event that a rate of cholesterol High blood levels are due to hypothyroidism, which returns to normal after hypothyroidism is controlled.

How to take the drugs

• Take the medicine at the same time each day.
• Always take the medicine the same way, with or without food, to get a constant supply of hormones.
• Avoid taking it with products containing soy milk, since soy decreases the absorption of thyroxine. Water, cow’s milk or orange juice are recommended.
• It is recommended to wait 4 hours before ingesting the following products, which interfere with the absorption of thyroxine^4,7 :

  – products that contain soy;

  – supplements of calcium, iron or antacids which contain calcium or aluminum hydroxide.