A Review of Drug-Induced Hyponatremia George Liamis, MD, Haralampos Milionis, MD, and Moses Elisaf, MD
Hyponatremia (defined as a serum sodium level Ͻ 134 mmol/L) is the most common electrolyte
abnormality in hospitalized patients. Certain drugs (eg, diuretics, antidepressants, and antiepileptics)have been implicated as established causes of either asymptomatic or symptomatic hyponatremia. However, hyponatremia occasionally may develop in the course of treatment with drugs used ineveryday clinical practice (eg, newer antihypertensive agents, antibiotics, and proton pump inhibitors). Physicians may not always give proper attention in time to undesirable drug-induced hyponatremia. Effective clinical management can be handled through awareness of the adverse effect of certainpharmaceutical compounds on serum sodium levels. Here, we review clinical information about theincidence of hyponatremia associated with specific drug treatment and discuss the underlying patho-physiologic mechanisms. Am J Kidney Dis 52:144-153. 2008 by the National Kidney Foundation, Inc.INDEX WORDS: Adverse drug reaction; hyponatremia; sodium homeostasis; syndrome of inappropriate secretion of antidiuretic hormone; water homeostasis. Hyponatremia (defined as a serum sodium PATHOGENETIC ASPECTS
level Ͻ 134 mmol/L) is a common electro-
OF HYPONATREMIA
lyte disturbance in clinical practice that is associ-
Hyponatremia is ascribed to either water reten-
ated with considerable morbidity and mortal-
tion or (less often) loss of effective solute (so-
ityDrugs are a common cause of electrolyte
dium plus potassium) in excess of water. Be-
abnormalities, and a careful drug history is essen-
cause the capacity for water excretion normally
tial in patients with electrolyte abnormalities.
is so great, retention of water resulting in hypona-
One of the more common electrolyte abnormali-
tremia takes place only in the presence of condi-
ties that may be drug induced is hyponatremia. A
tions that impair renal excretion of water. An
thorough understanding of the pathophysiologi-
exception to this rule is primary polydipsia, in
cal process of drug-induced hyponatremia and
which the excessive water intake can overwhelm
associated risk factors is of great importance for
even normal excretory capacity. Given that sup-
prevention and prompt and effective intervention
pression of arginine vasopressin (antidiuretic hor-
in this potentially life-threatening disturbance.
mone [ADH]) secretion is essential for the excre-
Here, we review clinical information about the
tion of any water load, the presence of high
incidence of hyponatremia associated with spe-
serum ADH concentrations is the sine qua non
cific drug treatment and discuss the underlying
for the development and maintenance of hypona-
pathophysiological mechanisms and therapeutic
tremia. Virtually all causes of hyponatremia (ex-
cept renal failure and primary polydipsia) arecharacterized by an excess of ADH (despite thepresence of hypotonicity), most frequently causedby syndrome of inappropriate ADH secretion
From the Department of Internal Medicine, School of
(SIADH) or effective circulating volume deple-
Medicine, University of Ioannina, Ioannina, Greece.
tion (which is a normal stimulus to ADH secre-
Received November 13, 2007. Accepted in revised formMarch 3, 2008. Originally published online as doi:10.1053/j.ajkd.2008.03.004 on May 8, 2008.Address correspondence to Moses Elisaf, MD, Professor
creates an osmotic gradient between extracellu-
of Medicine, Department of Internal Medicine, School of
lar and intracellular fluid in brain cells, causing
Medicine, University of Ioannina, 45110 Ioannina, Greece.
movement of water into cells. Therefore, symp-
toms of hyponatremia (predominantly neurologi-
2008 by the National Kidney Foundation, Inc. 0272-6386/08/5201-0020$34.00/0
cal) are attributed to cerebral edema. Moreover,
they are related to both the severity and rapidity
American Journal of Kidney Diseases, Vol 52, No 1 (July), 2008: pp 144-153
Hyponatremia Due to Drug TreatmentTable 2. Rare Causes of Drug-Induced Hyponatremia
ponatremic patients at risk of neurological com-plications caused by acute cerebral edema are
postoperative menstruating women, elderly
women on thiazide therapy, children, psychiatric
3,4-Methylenedioxymethylamphetamine Antibiotics
DRUG-INDUCED HYPONATREMIA
Hyponatremia related to drug treatment can be
caused by dozens, perhaps hundreds, of medica-
tions. Because hyponatremia can have many
Table 1. Principal Causes and Underlying Mechanisms of Drug-Induced Hyponatremia
Drugs affecting sodium and water homeostasis
other causes, the diagnosis of drug-induced hypo-
As shown in evidence from small studies and
case reports, drugs may cause hyponatremia by
affecting sodium homeostasis and water ho-
Tricyclic antidepressants (amitryptiline,
meostasis. Clinical information about the inci-
dence and pathophysiological process of hypona-
tremia of the most commonly offending agents is
from occasionally reported cases also are pre-
Drugs Affecting Sodium and Water Homeostasis Diuretic Treatment
Vinca alkaloids (vincristine, Platinum compounds (cisplatin,
causes of hyponatremia, with an estimated inci-
dence of 11% in 1 series of 114 geriatric pa-
Miscellaneous (methotrexate, interferon ␣ and ␥,
diuretics are the most common cause of commu-
nity-developed hyponatremiaDiuretic-induced
hyponatremia is caused almost exclusively by
thiazide or thiazide-like agentsLoop diuret-
ics, by inhibiting sodium chloride reabsorption
in the thick ascending limb of the loop of Henle,
reduce the osmolarity of the medullary intersti-
tium. Consequently, loop diuretics rarely are asso-
ciated with hyponatremia because they impair both
the renal concentrating and diluting mechanisms
Conversely, thiazide diuretics acting solely in the
distal tubules do not interfere with urinary concen-
tration and the ability of ADH to promote water
retention, which is the critical point for the develop-
Abbreviation: ADH, antidiuretic hormone.
It should be noted that hyponatremia also
cently, we validated this concept, and serum uric
follows indapamide administration, as well as
acid levels that could differentiate the 2 subgroups
the combination of hydrochlorothiazide and
of diuretic-induced hyponatremia also were de-
rothiazide and amiloride appears to increase the
acid level less than 4 mg/dL (Ͻ238 mol/L)
risk of hyponatremia. This increase probably is
showed a biochemical profile consistent with an
caused by the additional effect of amiloride on
SIADH-like state, whereas patients with a serum
the renal handling of sodium. Amiloride has a
uric acid level of 4 mg/dL or greater had a
direct effect on the collecting tubule, increasing
biochemical profile compatible with extracellu-
sodium loss. Effects of thiazides are mainly on
lar volume depletion. Recognition of these 2
the distal tubule; therefore, the combination com-
profiles aids the evaluation and management of
pounds the urinary loss of sodium. Moreover,
patients. In patients with extracellular volume
amiloride, which spares potassium, aggravates
depletion, normal saline solution with or without
thiazide-induced hyponatremia as a consequence
potassium chloride should be administered intra-
of potassium retention by exchanging it for so-
venously to correct hypovolemia and hypokale-
dium in the distal tubule. Thus, sodium defi-ciency has been implicated as the major etiologic
mia, if present. Conversely, in patients with an
factor of hyponatremia induced by the combina-
SIADH-like state who present with severe symp-
tomatic hyponatremia, the treatment consists of
Despite numerous studies, the pathophysiologi-
hypertonic sodium chloride solution (3%) admin-
cal mechanisms underlying diuretic-induced hy-
istration, along with water restriction.
ponatremia are unclear. Among the implicated
The diagnosis of diuretic-induced hyponatre-
mechanisms, the most important are as follows:
mia is based on a history of diuretic use and the
(1) excess renal loss of effective solutes (potas-
finding that hyponatremia resolved after discon-
sium plus sodium) compared with water losses
tinuing the offending agent. However, achieve-
resulting from both diuretic-induced electrolytes
ment of normonatremia and full recovery of
losses and ADH-induced water retention; (2)
diluting ability may be delayed for 1 to 2 weeks
diuretic-induced volume depletion that appropri-
after drug withdrawal. Consequently, in patients
ately stimulates ADH secretion; (3) the coexis-
with diuretic-induced hyponatremia and an
tent hypokalemia leading to a transcellular cation
SIADH-like profile, unless there is strong evi-
exchange in which potassium leaves the cells to
replenish the extracellular stores, whereas so-
SIADH, a comprehensive diagnostic evalua-
dium moves into cells to preserve electroneutral-
tion should be postponed for 2 to 3 weeks.
ity; (4) direct inhibition of urinary dilution by
However, taking into consideration that thia-
diminishing sodium chloride reabsorption in the
zides may aggravate the hyponatremia induced
renal tubules; (5) stimulation of thirst; (6) magne-
sium depletion; and (7) excessive ADH secre-
proach if even mild hyponatremia persists af-
mia occasionally is observed as an idiosyncraticreaction, particularly in subjects who consume
Drugs Affecting Water Homeostasis
large quantities of waterMost cases of thiazide-induced hyponatremia occur in elderly patients,
Except for diuretics, several other drugs that
impair the renal diluting capacity also can induce
subjects with low body mass appear to be more
ways drugs can affect water homeostasis: they
There are 2 groups of patients with diuretic-
can increase ADH secretion centrally, potentiate
induced hyponatremia, one consistent with extra-
the effect of endogenous ADH at the renal me-
cellular volume depletion and another that simu-
dulla, and reset the osmostat, thus lowering the
lates SIADH. Serum uric acid level has been
proposed as an index to discriminate between
of the most important offending agents are re-
Hyponatremia Due to Drug TreatmentDrugs that Increase ADH Secretion Centrally
Oxcarbazepine is a 10-keto analogue of car-
Psychotropic agents. Psychotropic agents have
bamazepine and is a useful drug in treating
often been implicated in the cause of hyponatre-
patients with the same seizure types, but it may
mia, including both antidepressants (tricyclics, se-
have an improved toxicity profile. However,
lective serotonin reuptake inhibitors [SSRIs], and
the prevalence of hyponatremia, as well as the
monoamine oxidase inhibitors) and antipsychotic
frequency of severe hyponatremia, is greater in
drugs (phenothiazines and butyrophenones)
patients treated with oxcarbazepine than with
hyponatremia is believed to be the development
can cause hyponatremia, possibly because of
of SIADH. However, it should be emphasized
that low serum sodium levels in emotionally
Antineoplastic agents. Vincristine and, less of-
disturbed or psychotic patients may not be a
ten, vinblastine are associated with hyponatre-
direct consequence of these medications. Among
the most frequent causes of hyponatremia in this
tor control of ADH secretion through a direct
toxic effect on the neurohypophysis and hypotha-
and the compulsive water drinking. Primary poly-
lamic system. That peripheral neuropathy often
dipsia is prominent in patients with psychosis,
is observed in patients with vinca alkaloid–
affecting nearly 7% of patients with schizophre-
related SIADH is indirect evidence for this neu-
the sensation of a dry mouth caused by psycho-
Hyponatremia associated with platinum com-
tropic drugs (especially phenothiazines) may con-
pounds is described more frequently with cispla-
tin than with carboplatinThe possible under-
causality between psychotropic agents and hypo-
lying pathophysiological mechanisms by which
natremia was shown more persuasively with an-
cisplatin induces hyponatremia are SIADH and
tidepressants and mainly with SSRIs, which cause
renal salt wastingCisplatin-induced hyponatre-
hyponatremia more frequently than other antide-
mia often is combined with hypomagnesemia,
pressant drugs. The incidence of hyponatremia
hypokalemia, and hypocalcemia, with increased
caused by SSRIs varies widely from 0.5% to
magnesium, potassium, and calcium renal losses,
32%. In the majority of cases, hyponatremia
respectively. This constellation of electrolyte dis-
occurs within the first few weeks of the onset of
turbances (observed only rarely in patients with
therapy, whereas the normonatremia is achieved
SIADH) is believed to be mediated by cisplatin-
within 2 weeks after drug withdrawal. Older age
related tubular necrosis. The incidence of hypo-
and concomitant use of diuretics are the most
natremia secondary to cisplatin can be as high as
important risk factors for the development of
43%. However, it is difficult to define precisely
given that the majority of cases described are in
Antiepileptics. Hyponatremia has repeatedly
been associated with carbamazepine therapy
Another drug that deserves emphasis is cyclo-
Carmabazepine can induce hyponatremia by in-
phosphamide. This alkylating agent, when admin-
creasing ADH release from the neurohypophy-
istered intravenously, can cause hyponatremia,
sis. The incidence of carbamazepine-induced hy-
impairing water excretion by potentiating the
ponatremia ranged widely from 4.8% to 41.5%,
effect of ADH and possibly by increasing its
release. Patients on cyclophosphamide therapy
Specifically, this electrolyte disturbance fre-
are at high risk of developing hyponatremia
quently was encountered in the elderly or sub-
because they are encouraged to drink large
jects who simultaneously used other medications
amounts of fluids to maintain high urine output
known to cause hyponatremia (mainly diuret-
as an effort to prevent chemical cystitis. The
combination of both increased ADH effect and
effects of carbamazepine correlated with carbam-
water intake can induce potentially life-threaten-
azepine dose, serum carbamazepine level, and
ing water intoxication. Administration of iso-
tonic saline solution instead of using water is an
appropriate measure to minimize the incidence
Nonsteroidal anti-inflammatory drugs. Nonste-
roidal anti-inflammatory drugs (NSAIDs) de-
It should be emphasized that in patients with
crease water excretion by potentiating the ef-
chemotherapy-related hyponatremia, chemo-
fect of ADH. This is caused by a decrement in
therapy-induced nausea may have an important
renal prostaglandin synthesis because prosta-
role because nausea is a potent stimulus to ADH
glandin normally is an inhibitor of ADH ac-
release. Moreover, immunomodulators, includ-
tion. It should be noted that hyponatremia
ing interferon, interleukin 2, and levamisole, as
attributable exclusively to NSAIDs is rare,
well as monoclonal antibodies, also were shown
probably because prostaglandin inhibition also
mechanism in the majority of cases seems to
trally. However, volume-depleted patients or
be SIADH. Finally, methotrexate in high doses
those with SIADH simultaneously using this
can cause hyponatremia. A toxic effect on the
group of medications have increased risk of
neurosecretory areas of the cerebrum, as well
as alteration of the distribution of body fluid
appears that NSAIDs are a risk factor for hypona-
volumes, was proposed as a possible explana-
tion of methotrexate-induced hyponatremia
This association was described during military
Analgesics. Morphine and other opiates have
operations and desert hikes. Such individuals
often been implicated as a cause of hyponatremia,
also may be using NSAIDs, which can impair the
possibly by directly enhancing ADH releaseIn
excretion of free water. Ultramarathon and mara-
addition, indirect stimulation of ADH secretion
thon runners may replace their dilute, but sodium-
caused by opiate-induced nausea or hypotension
containing, sweat losses with excessive amounts
of hypotonic solutions, with the net effect of adecrease in plasma sodium concentration. How-
Drugs that Potentiate the Effect of Endogenous
ever, the risk of hyponatremia in runners using
ADH at the Renal Tubule Level Antiepileptic drugs. It was proposed that car- Drugs that Reset the Osmostat
bamazepine may cause hyponatremia by increas-
Hyponatremia caused by a reset osmostat syn-
ing renal sensitivity to normal plasma ADH
drome variant of SIADH has been described
lafaxine, a serotonin and norepinephrine re-
Hypoglycemic agents. Chlorpropamide, which
is now rarely used in the treatment of patientswith diabetes mellitus, can cause hyponatremia
Drugs Inducing Labor
in approximately 4% to 6% of patients with
Oxytocin, used to induce labor or abortion,
clinical characteristics of SIADH. Elderly pa-
has significant antidiuretic activity. Therefore,
tients concomitantly using diuretics have greater
when administered with excess electrolyte-free
amide can cause hyponatremia by decreasing
by decreasing the amount of water given and
ing that although fluid retention is a common
using isotonic saline, rather than dextrose and
adverse effect of both thiazolidinediones (piogli-
water. Moreover, administration of exogenous
tazone and rosiglitazone), hyponatremia related
ADH (as part of the treatment of patients with
to these drugs was not reported yet. Finally, there
gastrointestinal hemorrhage) also can cause hy-
is only 1 case report with metformin-related
ponatremia. Finally, hyponatremia can be in-
duced by desamino-8-D-AVP (an analogue of
Anticancer agents. In addition to increasing
ADH), which is used for either polyuria in pa-
ADH release, intravenous cyclophosphamide can
tients with central diabetes insipidus or bleeding
cause hyponatremia by potentiating the effect of
caused by platelet dysfunction (von Willebrand
Hyponatremia Due to Drug TreatmentDrug-induced Dilutional or
results if measured in undiluted samples (direct
Translocational Hyponatremia
In some cases, the decrease in serum sodium
Intravenous immune globulin frequently is
levels is associated with normal or increased effec-
administered in a 10% maltose solution. Maltose
tive plasma osmolality, rather than hypo-osmolal-
normally is metabolized by maltase in proximal
ity. This was called dilutional or translocational
tubules. However, in patients with renal failure,
hyponatremia.Administration of hypertonic manni-
maltose accumulates in extracellular fluid, in-
tol is an example of pseudohyponatremia with
creasing plasma osmolality and diminishing se-
increased plasma osmolality. Mannitol (by increas-
ing plasma osmolality) creates a transcellular os-
locational (hyperosmotic) hyponatremia also can
motic gradient, resulting in water movement out of
be observed with sugar-containing intravenous
the cells and decrease in serum sodium concentra-
immune globulin administration. It appears that
the magnitude of hyponatremia depends consid-erably on the degree of renal impairment during
Rare Causes of Drug-induced Hyponatremia
intravenous immune globulin infusion. In the
setting of impaired renal function, decreased
sporadic case reports of numerous other drugs
renal clearance of sucrose takes place, leading to
that can cause hyponatremia. Some of these
increased effective plasma osmolalityFinally,
relatively rare causes of drug-induced hyponatre-
intravenous administration of immune globulin
also can cause hyponatremia because of asepticmeningitis-related
Angiotensin-Converting Enzyme Inhibitors
It is worth mentioning that angiotensin-con-
Amphetamines
verting enzyme (ACE) inhibitors in combinationwith furosemide were shown to correct hypona-
tremia in patients with congestive heart failure.
amine (MDMA), also known as ecstasy, is a
However, ACE inhibitors per se can cause hypo-
increasingly recognized cause of severe hypona-
natremia. A handful of cases of ACE inhibitor–
tremia. MDMA and its metabolites were shown
related hyponatremia was reportedThese drugs
to induce enhanced ADH secretion from the
inhibit the conversion of angiotensin I to angio-
hypothalamus. The excessive water intake (to
tensin II in peripheral tissue, but not the brain. In
counteract hyperthermia) is common in MDMA
the brain, angiotensin I is converted to angioten-
users and is involved in the pathogenesis of
sin II, which may stimulate thirst and the release
of ADH. Additionally, ACE inhibitors induce anincrease in ADH secretion by delaying the degra-
Co-Trimoxazole
Trimethoprim-sulfamethoxazole (co-trimox-
Immune Globulin
azole) is known to cause hyperkalemia and,less frequently, hyponatremia. These electro-
It is well known that hyperlipidemia or hyper-
proteinemia can induce pseudohyponatremia. Fur-
lyte disturbances take place more often in
thermore, intravenous infusion of immune globu-
lin increases the protein-containing nonaqueous
methoprim-sulfamethoxazole and those with
phase of plasma, with a consequent relative de-
renal dysfunction. Trimethoprim acts as a po-
crease in plasma water volume. Because sodium
tassium-sparing diuretic by blocking the amilo-
is present in only the aqueous phase, each unit
ride-sensitive sodium channels in the distal
volume of plasma measured has less sodium-
tubule. Consequently, the mild hyponatremia
containing water, and this is interpreted as hypo-
observed in patients administered trimethoprim
natremia. Newer methods using ion-selective
should be attributed to ongoing sodium losses
electrodes for the measurement of serum electro-
that lead to hypovolemia and increased ADH
lytes may avoid this problem and give accurate
Amiodarone
physiological mechanism of hyponatremia is not
Hyponatremia is a rare adverse effect of amio-
entirely clear, but is believed to be SIADH.
darone therapy. SIADH is the possible underly-
Salt-losing nephropathy has also been proposed
ing mechanism. It was proposed that amiodarone
as a possible mechanism of PPI-related hypona-
might cause SIADH through its channel-modulat-
tremia given that these drugs are now the most
ing properties on neural or renal tissues. Amioda-
common cause of drug-induced acute interstitial
rone-induced hyponatremia occurs mainly dur-
nephritis. However, causality between PPI-
ing the first weeks of therapy or even during
induced hyponatremia and renal salt wasting was
the loading period. It is worth mentioning that
SIADH also was reported in association withother antiarrhythmic drugs, such as lorcainide
CONCLUDING REMARKS Calcium Channel Antagonists
the course of treatment with drugs used in every-day clinical practice (eg, newer antihypertensive
In theory, calcium channel antagonists with
agents, antibiotics, and PPIs). It should be noted
natriuretic properties could cause hyponatremia.
that patients may receive complex drug regimens
A case of amlodipine-associated hyponatremia
(eg, patients with diabetes mellitus) containing
several candidates as the cause of hyponatremia.
received amiodarone, which had not been recog-
Discontinuation of treatment with these agents
nized as a cause of hyponatremia at the time of
and avoidance of readministration is fully war-
publication. Consequently, calcium channel an-
ranted. It is recommended that patients with
tagonist–related hyponatremia, if it exists, is ex-
acute severely symptomatic hyponatremia (eg,
seizures) should be treated in an aggressive but
Theophylline
controlled fashion, whereas less symptomatic
Theophylline-induced hyponatremia has rarely
hyponatremia may be corrected at a slower
been described. Theophylline inhibits solute re-
absorption in both the proximal nephron and
tic target in all cases to limit the increase in
diluting segment, with a thiazide-like action.
serum sodium concentration to less than 12
Furthermore, theophylline can cause hypokale-
mEq/L (Ͻ12 mmol/L) in the first day and less
mia, especially in patients with acute intoxica-
than 18 mEq/L (Ͻ18 mmol/L) in the first 2 days
tion. Depletion of potassium is expected to con-
of treatment, as well as avoid overcorrection of
serum sodium concentration to greater than 140
concentration is determined by the ratio of “ex-
mEq/L (Ͼ140 mmol/L) within the first 2 days of
changeable” (ie, osmotically active) portions of
the body’s sodium and potassium content to
verse effect of certain pharmaceutical com-
total-body water. It also was proposed that potas-
pounds on serum sodium concentrations facili-
sium depletion shifts sodium to the intracellular
tates a rational clinical management.
space. Additionally, theophylline-associated SI-ADH is
ACKNOWLEDGEMENTS Proton Pump Inhibitors
Proton pump inhibitors (PPIs) also can cause
hyponatremia. Currently, only 9 cases of PPI-
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Szemle DEMOKRÁCIA Az emberi egyenértékûség Krisztus- sal kezdõdik, ezért nincs és nem is lehet felebaráti de-mokrácia Krisztus és tanítása nélkül. (1974. július 1.)Ha a kisebbség erõlteti rá akaratát a többségre, eznem demokrácia, hanem egészen másvalami. (1948. Az igazi demokrácia alappillére, hogy sértetlen O R S Z Á G G Y Û L É S természetj
original article J ournal of A ndrological S ciences 2011;18:64-71 Up-to-date on erectile dysfunction and treatment V. Gentile, S. Salciccia, P. Fele*, G.M. Busetto Dipartimento di Scienze Ginecologico-Ostetriche e Scienze Urologiche, Sapienza Università di Roma, Italy; * Dipartimento di Scienze Ostetrico-Ginecologiche, Urologiche e Medicina della Riproduzione, Università Federi