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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.
General Administration Information. Administer SYNTHROID as a single daily dose, on an empty stomach, one-half to one hour before breakfast. Administer SYNTHROID at least 4 hours before or after drugs known to interfere with SYNTHROID absorption [see Drug Interactions (7.1)].