how long should you wait to take an antacid with levothyroxine
Antacids often used to treat heartburn and other intestinal distress, including calcium products such as TUMS or ROLAIDS and other antacids, may have absorption-inhibiting effects on thyroid medications. People should take levothyroxine four to six hours before or after taking these antacids. Iron supplements (FEOSOL, SLOW FE) have been shown to reduce the effect of levothyroxine in some people, although the effect is highly variable from one person to another.