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Despite the fact, that no No side effects mentioned, there are mentioned. There are some contradictions that patients with cardiac pacemakers or with implanted defibrillator should not use Quell, neither people with implated metallic or electronic devices. At least<ref>Frequently Asked Questions by Clinicians: https://www.quellrelief.com/clinicians, December 15, patient should 2015</ref> Patient is supposed to consult the using with a doctor. On the other hand no medication doesn't restrict Quell-using.<ref>Quell relief official website, Clinicians: https://www.quellrelief.com/clinicians</ref>
→Health Risks: update
<!-- Any related health issues, be it already discovered and covered in literature, or just speculative ones, should be described and properly cited in this section. -->
Official statement from Neurometrix about side effects is that there are none[https://www.quellrelief.com/clinicians]. Usage is 100% drug free, with clearance by FDA (Food and Drug Administration) received in 2014.
However, there are another information sources which discuss TENS technology. For example they claim, that TENS method is surely inexpensive and safe, but there are risk with using electrodes on damaged skin, or over area of malignancy,<ref>Searle, R.D., Bennett M.I., Johnson M.I., Callin S., Radford H., Letter to editor: transcutaneous electrical nerve stimulation (TENS) for cancer bone pain. Palliat Med, 2008; 22 : 878 - 9</ref> or it could trigger a seizure in epileptic patient in case that electrodes will be put near patient's head or neck.<ref>Jones, Iain, Johnson Mark I., Transcutaneous electrical nerve stimulation, 2009</ref> Regarding these risks, most of them patients may avoid as Quell is used only on an upper calf.
Nevertheless we should wait for some new quality scientific trials and longe to show if Quell device brings some currently unknown specific healthy risks.
