Which statement regarding the administration of levothyroxine (Synthroid®) is incorrect?

Taking levothyroxine on a full stomach is not advisable because the absorption of the medication can be negatively affected by food, particularly substances like calcium, iron, and soy. It is recommended to take levothyroxine on an empty stomach, typically 30 to 60 minutes before breakfast, to ensure optimal absorption and effectiveness of the medication. This is why the statement about taking it on a full stomach is incorrect.

The other statements regarding the administration of levothyroxine are indeed correct. Taking the medication at the same time every day helps maintain consistent levels of the hormone in the bloodstream, contributing to stable thyroid function. Not switching brands without consulting a doctor is crucial because different brands may have slight variations in their formulations, which can affect how the body absorbs the hormone. Regular monitoring of thyroid levels is necessary to ensure that the dosage is appropriate and to make adjustments if needed, as individual needs can change over time.