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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.
In a perfect world: You would take your synthroid (thyroxine) an hour or two prior to your adderall. Remember, you should avoid taking your synthroid (thyroxine) with diary and/or mineral supplements too. Overall though, there really isn't any significant interaction between the two medications. ...Read more.