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You can take levothyroxine either one hour before meals or two hours after eating and one hour before taking other meds and any vitamins and supplements but two hours before taking iron or calcium. Source(s): I'm a nurse. Nope, your supposed to take it on an empty stomach, then eat an hour or so after you take it.
Re: how long does it take for levothyroxine to start working after taking it. I started to feel the effects after about two weeks. Unfortunately, I felt no positive effects whatsoever but plenty of negative ones: wide awake at night, exhausted during the day, chronic diarrhoea etc.