More than 200,000 Cefaly devices in use. Data since 2008.
The side effects of Cefaly
Observed in 4.3% of patients
Mild and completely reversible
Most common: intolerance to the feeling of Cefaly on the forehead
Most severe: allergic skin reaction to the electrode
The most common side effects
Intolerance to the feeling of Cefaly on the forehead: 1.25%
Sensation of fatigue during and after the session: 0.65%
Headache after one session: 0.52%
Irritation of the skin on the forehead: 0.22%
The magnetic field right next to the Cefaly is below 0,2µT (i.e. 2mG). This value is negligible compared to the field generated by an electric shaver (typically between 15 and 1500µT when measured at 3cm) or by an hair dryer (typically between 6 and 2000µT).
Neurostimulation has been used for more than 20 years with devices that are implanted in the head and which work constantly for several years. The only problems encountered with implantable neurostimulators relate to the surgical procedure involved to implant them, and never to the neurostimulation technique itself. This is why this technique is regarded as exceptionally safe. Cefaly's great breakthrough is to allow this technique of neurostimulation to be used in an external and gentle manner.