NÃO FAÇA ISSO SE VOCÊ TOMA HORMÔNIO DA TIREOIDE

Levothyroxine (synthetic T4) replacement therapy is one of the most common forms of treatment for hypothyroidism. However, simply taking the medication isn't enough—intestinal absorption, metabolism, and several external factors directly influence the amount of hormone that reaches the bloodstream. Studies show that many patients experience "refractory hypothyroidism" or require increasingly higher doses even with apparent adherence to treatment—much of this is due to factors that interfere with the absorption or metabolism of the hormone. The hormone in oral form must first be dissolved in the stomach (at an appropriate pH), then absorbed in the small intestine (jejunum/ileum). If any of these steps fail, the availability of the hormone to the body decreases. 2. Pharmaceutical and Formulation Factors (Because the form of the medication and the method of administration greatly influence its effectiveness.) The dosage form matters: tablets contain excipients and coatings, and require dissolution in the correct environment. If gastric pH is altered, dissolution may fail. When taken with food or beverages, especially on an empty stomach, hormone absorption may be reduced, delayed, or with a lower absorption peak. Some alternative forms (capsules or liquid solution) can circumvent dissolution problems or altered pH, improving absorption in cases of digestive diseases or use of medications that affect the stomach. 3. Pathological conditions that impact absorption (Digestive diseases or medical conditions affecting the gastrointestinal tract.) Diseases such as atrophic gastritis, celiac disease, lactose intolerance, or Helicobacter pylori infection can damage the stomach or intestinal lining, reducing hormone absorption. Patients who have undergone bariatric surgery or removal of part of the intestine may experience a reduced absorption surface or altered intestinal motility, significantly impacting the hormone's bioavailability. Conditions of slow or rapid intestinal motility can also affect the time the hormone remains available for absorption. 4. Interactions with Food, Supplements, and Drugs (Behavioral/external aspects that every patient should be aware of.) Many foods or substances directly interfere: dietary fiber, soy products, coffee, or tea consumed close to taking the medication can significantly reduce absorption. Coffee or tea, especially if consumed within 1 hour of taking the medication, can hinder the absorption of levothyroxine. Mineral supplements such as calcium, iron, aluminum (in antacids or chelators), resins, or some medications that alter gastric pH (e.g., proton pump inhibitors) can "bind" or interfere with the medication, making it less available for absorption. Timing of administration is critical: taking on an empty stomach is generally recommended to maximize absorption. Taking it outside of this context (just before eating) delays the peak and reduces the fraction absorbed. 5. Individual variables and metabolism (Each person may react differently.) Body weight, liver function, plasma proteins, and genetic variants that affect metabolism (deiodination enzymes) may require different doses. Even with proper adherence, people with a smaller intestinal surface area (due to surgery or disease) may absorb less of the hormone, requiring a dose adjustment by the clinician. 6. Best practices and recommendations for patients Always take the medication on an empty stomach, with water—and wait at least 30 minutes to 1 hour before eating. This facilitates proper dissolution and absorption. Avoid consuming food or beverages such as coffee or tea immediately after taking the medication. It is best to wait this interval to avoid interference. If you take mineral supplements (iron, calcium, etc.) or medications that alter gastric pH, talk to your doctor about adjusting the dosing schedule to avoid overlapping with your hormone dose. In cases of digestive disorders or after surgery, it may be necessary to switch to liquid or capsule formulations that have absorption less dependent on pH or intestinal motility. Have regular tests (TSH, free T4, T3 if necessary) to monitor whether your dose is adequate. If, even with adherence, your values ​​are outside the target range, it is important to investigate possible causes of malabsorption. APPOINTMENTS; 📲 Schedule your in-person or online consultation throughout Brazil at: ✅ WhatsApp +55 92 98557-7348 🛜 WhatsApp Link: https://bit.ly/4cKxZGq 🌐 Or through the website www.drmarciofernandes.com Big hugs to everyone 😀😀 It is important to emphasize that the information linked in the videos is educational in nature and under no circumstances is intended to replace a medical consultation or serve as a recommendation for any treatment plan. For evaluations, always seek a qualified professional.