medication timing
4 interactions related to medication timing
levothyroxine + magnesium
Taking magnesium too close to levothyroxine can modestly reduce how much of the thyroid medicine is absorbed, because magnesium can bind levothyroxine in the gut.
levothyroxine + iron
When taken at the same time, iron can reduce how much levothyroxine your body absorbs by forming a poorly soluble complex in the gut, which can blunt the effect of your thyroid medication and raise TSH.
St. John's Wort + SSRI
St. John's Wort is pharmacologically active, not a harmless herb, and it interacts with SSRIs in two overlapping and hard-to-predict ways. The result is a combination most clinicians prefer to avoid rather than manage.
antibiotics + probiotics
Taken at the same moment, an antibiotic can kill bacterial probiotic organisms before they reach the gut, lowering the probiotic's benefit. Spacing the doses apart fixes it.