There may be a relationship between proton pump inhibitors (PPIs) and iron absorption. PPIs
may decrease the amount of iron absorbed gastrointestinally specifically due to alteration of
the pH in the duodenum. Restless legs syndrome (RLS) is a sensorimotor disorder that includes
an urge to move legs, accompanied or caused by uncomfortable and unpleasant sensations
in the legs; the urge to move begins or worsens during periods of rest or inactivity, the urge
to move is partially or totally relieved by movement, and the urge is worse or only occurs at
night. In the majority of the restless leg syndrome population, the sensation is deep seated,
often described as being in the shin bones, and most commonly felt between the knee and
ankle. It may be described as a creepy, shock-like, tense, electric, buzzing, itchy, or even
numb sensation. A subpopulation of this restless leg syndrome patient population experiences
restless leg syndrome associated pain (RLSAP) that has been described as a deep “achy pain.”
This pain has not been found to be relieved by many of the typical over the counter analgesics.
Often, constant movement of the legs appears to be the only remedy, as these sensations
usually appear during periods of rest.
Furthermore, there appears to be an association between iron deficiency and those suffering
from Restless Leg Syndrome (RLS). The authors theorize that there may be a possible correlation
between PPIs and the symptoms (e.g. pain) associated with RLS. The authors propose that
PPIs, such as omeprazole, may interfere with iron absorption in certain patients and that a
subpopulation of patients who develop significant iron deficiency characterized by low serum
ferritin levels while on PPIs may also develop RLS-like symptoms (including RLSAP). While
there is no robust direct evidence to support any associations of PPIs and iron deficiency or
PPIs associated with RLS-like symptoms (including RLSAP), it is hoped that this manuscript may
spark research efforts on this issue.
Key words: Proton pump inhibitor (PPI), Restless Leg Syndrome (RLS), iron deficiency, pain,
iron absorption, Restless Leg Syndrome Associated Pain (RLSAP)