In March 2020, the French authorities warned against the use of ibuprofen in patients
with coronavirus disease 2019 (COVID-19) symptoms [1, 2]. This advice was based on
unconfirmed anecdotal reports that severe COVID-19 cases had been exposed to ibuprofen
[3] and on the theories described below. In particular, concern surrounded a possible
increased expression of the angiotensin-converting enzyme (ACE)-2 receptor [4], which
is the target for cell penetration of severe acute respiratory syndrome coronavirus
2 (SARS-CoV-2) [5]. This was reported on by the BMJ [6–8] and resulted in an 80% decrease
in the use of ibuprofen in France [9]. The European Medicines Agency urged prudence
[10]. The World Health Organization initially recommended not using ibuprofen, then
relented [11]. Similarly, the Medicines and Healthcare products Regulatory Agency
in the UK reversed their initial recommendation to avoid nonsteroidal anti-inflammatory
drugs (NSAIDs) [12], concluding “There is currently no evidence that the acute use
of NSAIDs causes an increased risk of developing COVID-19 or of developing a more
severe COVID-19 disease.” The Italian Society of Pharmacology released a statement
along the same lines [13]. Among all NSAIDs, ibuprofen was probably targeted because
it is widely used and available over the counter (OTC), unlike other NSAIDs in France.
The bases for the French Ministry’s decision appear to be as follows:
A suggestion that ibuprofen might upregulate ACE-2, thereby increasing the entrance
of COVID-19 into the cells [4, 14]. In a single study in streptozotocin-induced diabetic
rats, ibuprofen decreased cardiac fibrosis [15]. We found no corresponding human study
[16]. An increased risk of severe COVID-19 was noted in patients with hypertension
or diabetes, and a possible role of ACE inhibitors (ACEIs) or angiotensin receptor
blockers (ARBs), and thiazolidinedione antidiabetic drugs, which also upregulate ACE-2,
was suggested [4].
An analogy with bacterial soft-tissue infections, where patients receiving NSAIDs
had more severe infections because of the immune-depressive actions of NSAIDs or belated
treatment because of initial symptom suppression [6, 17–19].
Fever is a natural response to viral infection and reduces viral activity: antipyretic
activity would reduce natural defenses against viruses.
However, the relevance of these assertions is unclear. The relevance of the upregulation
of ACE-2 in the occurrence or severity of COVID-19 is disputed [20, 21]. Several studies
found no impact from previous use of ACEIs or ARBs on COVID-19 frequency [22–24] and
recommended against stopping ACEIs or ARBs [21, 25, 26]. In fact, ACE-2 upregulation
might also limit the severity of COVID-19 infection [25, 27], and studies reported
a lower death rate in patients using ACEIs [24].
The finding that ibuprofen might upregulate ACE-2 came from a single animal experiment
in myocardial fibrosis in streptozotocin-induced diabetic rats [15]. If confirmed
in humans, this upregulation would be related to chronic use of NSAIDs before the
infection, in which case the upregulation might increase the risk of SARS-CoV2 penetration
into the cells, causing COVID-19.
However, chronic use of NSAIDs was not associated with COVID-19 [22]. Chronic use
of NSAIDs might even be protective against both the occurrence and the severity of
COVID-19. A study of previous exposure to a range of medicines was conducted in 12,808
patients tested for SARS-COV-2 in five Massachusetts (USA) hospitals. In total, 2271
of these patients tested positive; 707 were admitted to hospital and 213 received
artificial ventilation. Exposure to ibuprofen, naproxen, oseltamivir, or atenolol
was associated with a lower risk of hospital admission, and ibuprofen was also associated
with a lower, albeit nonsignificant for lack of power, risk of artificial ventilation
(odds ratio 0.47 [95% confidence interval 0.14–1.05]) [28].
In the acute use of ibuprofen or other NSAIDs for the symptomatic treatment of COVID-19,
as discouraged by the French authorities, the hypothesis of an increased risk of infection
would not apply: these patients are already infected. In addition, the timeframe of
upregulation is unknown, so whether any upregulation exists at that point is uncertain.
The effects of any upregulation after infection are also unknown. If ACE-2 upregulation
also effectively mitigates COVID-19 symptoms, might using ibuprofen actually be beneficial?
An anti-inflammatory effect masking the early symptoms of infection resulting in belated
antibiotic or other treatment is not applicable here: no treatment for the virus exists
to be affected by masking symptoms. The disease itself is rather unusual in that even
relatively severe pulmonary infection commonly remains mostly asymptomatic until sudden
decompensation apparently related to a cytokine storm, an excessive immune reaction.
In this context, immune suppression or reduction might in fact be beneficial [28],
as has also been suggested for the use of corticosteroids [29, 30].
An antipyretic effect increasing the risk or severity of infection would apply equally
to all antipyretic agents, including paracetamol. None of the reports about the use
of ibuprofen in COVID-19 mention the use or not of paracetamol before or in the early
stages of infection, whereas this use is widespread [31–33].
These findings raise the following points:
An indication bias may exist: more severe cases with more symptoms and higher fever
might not respond well to the first-line antipyretic paracetamol, so ibuprofen would
then be used (channeling). The same has been described with soft-tissue infection
[34]. This may be compounded by a reporting notoriety bias [35], where only cases
exposed to ibuprofen are reported.
The reality of an increased risk of severe pneumonia in patients chronically on drugs
that upregulate ACE-2, such as NSAIDs, ACEIs, or ARBs, has not been shown; in fact,
upregulating ACE-2 might also have beneficial effects [20, 21, 25]. Prior use of ACEIs
either did not change or reduced the risk of death in patients with COVID-19 [22].
In a study of associations between exposure to ACEIs or ARBs and influenza, the risk
of influenza was lower with ACEIs or ARBs, and this protection increased with the
duration of use [36]. Preexisting diseases that may also be worsened by long-term
NSAIDs, such as hypertension or heart failure, seem to increase the risk of mortality
in COVID-19 [22, 37, 38].
A public health decision based on a few anecdotal reports and irrelevant experimental
data may have deprived patients of a drug effective at controlling pain and fever.
Encouraging the use of paracetamol while discouraging the use of ibuprofen might induce
patients to use higher doses of paracetamol rather than adding ibuprofen for symptom
control, increasing the risk of hepatic injury [31, 39–41], which might also be increased
by COVID-19-related alterations of liver function [42–44].
At this point, there exist no scientific data to support an increased risk of SARS-CoV-2
infection or COVID-19 severity with ibuprofen. As for chloroquine [45], it is certainly
time for a properly conducted study of the potential risks and benefits of ibuprofen
in COVID-19 [46, 47].
A prospective randomized trial is probably not feasible given the current circumstances
[48]. Studies of claims databases or medical records could capture previous chronic
use of medicines but probably not the use of OTC drugs such as ibuprofen or paracetamol
for symptom relief in the early stages of COVID-19. It might be appropriate to attempt
a study (e.g., case–control study such as NCT04383899) in a cohort of patients newly
diagnosed with COVID-19 to explore questions related to the early treatment of COVID-19
symptoms.