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Take Synthroid with water only on an empty stomach. Take Synthroid 4 hours before or after. taking iron or calcium supplements, or antacids. Soy, cottonseed meal, walnuts, fiber, and. grapefuit juice can affect the absorption of Synthroid.
How long should a person wait after taking Levothyroxine to drink milk or take calcium and vit, supp.? The general guideline is that you should wait at least 30 minutes to 1 hour between taking your meds and eating. My doc says at least 3 hours between taking thyroid meds and taking any calcium, iron or other vitamin supplements. The key thing however is to be very consistent in how you take your meds.