Find patient medical information for Synthroid oral on WebMD including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Your doctor will probably start you on a low dose of thyroid and gradually increase your. the next dose, skip the missed dose and continue your regular. Synthroid (levothyroxine) is a replacement for a hormone normally produced by your thyroid gland to regulate the body's energy and metabolism. Answers To - Can missing just one day of Synthroid (thyroid medication) cause palpitations, shakiness and fatigue? What happens if I miss a dose (Levothroid, Levoxyl, Synthroid, Tirosint, Unithroid)? Take the missed dose as soon as you remember. Skip the missed dose if it is. Learn about missing a dose, what happens if you overdose, and what to avoid when taking Synthroid (Levothyroxine Sodium). Levothyroxine (Oral Route) Print. Sections. However, if it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Learn about Synthroid (levothyroxine sodium tablets, USP) and click for full safety and prescribing information, including important safety information Read about the importance of checking your pill and taking Synthroid as prescribed by your doctor, and find important safety information here. What are the effects of missing a dose of. What are the effects of missing a dose of levothyroxine?. missing one dose of your low-dose levothyroxin does not.