The French National Agency for the Safety of Medicines and Health Products has issued a warning about the risk of using some medicines to relieve flu symptoms.
According to this agency, the use of drugs with pseudoephedrine increases the risk of stroke and heart attack.
The announcement has alarmed not only France but all of Europe, as these types of drugs, mainly in the form of nasal sprays, are everywhere on the shelves of pharmacies in every corner of the continent.
"The message is clear. Do not use them. We don't risk a heart attack or a stroke because of a blocked nose," declared Christelle Ratignier-Carbonneil, director of France's National Agency for the Safety of Medicines and Health Products (ANSM).
Many of these medications are also available as over-the-counter oral tablets or as a prescription nasal spray.
The French drug agency said there is an ongoing review of these drugs at European level.
Instead of getting a nasal decongestant, the ANSM recommends that people clear their noses with salt water sprays, drink plenty of fluids and ventilate their living spaces.
Pseudoephedrine has also come under increased scrutiny in some countries, including some restrictions in 2007 and 2008 in the United Kingdom, because it can be used illegally to make methylamphetamine.
Meanwhile, one of the active ingredients used to replace pseudoephedrine in some nasal decongestants, another drug called phenylephrine, was recently deemed ineffective by US regulators.