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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.
I'm wondering if taking the synthroid I normally wait 4 hours to eat after taking the pill so perhaps my stomach is too empty for too long and the medicine is causing the shakiness because there is nothing at all but synthroid in my system. . . Just starting my thyroid medicine for life thing with levothyroxine.