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tDCS vs Vagus Nerve Stimulation for Depression

June 16 2026,
Brain stimulation, Treatment options
2 min read
Dr Hannah Nearney
Consultant Psychiatrist (MBChB, MRCPsych, MSc, PGDip(CAT), NHS Innovation Accelerator Fellow)
TL;DR
  • tDCS vs implanted VNS: Both use gentle electrical stimulation to treat depression, but implanted VNS requires surgery under general anaesthesia and is typically a last resort for people who have not responded to antidepressants or ECT. Flow tDCS is a CE-marked, non-invasive medical device worn on the outside of the head, with minimal side effects and no surgical risk.
  • Who each treatment is for: Flow tDCS is suitable for a wide range of adults with depression. Implanted VNS is reserved for treatment-resistant cases where other options have already failed.
  • A note on taVNS: Transcutaneous vagus nerve stimulation (taVNS) is not the same as implanted VNS. It is an external device, typically worn on the ear, and currently lacks sufficient evidence to be recommended as a standalone depression treatment.

tDCS vs Vagus Nerve Stimulation for Depression

Both tDCS and implanted vagus nerve stimulation (VNS) treat depression by delivering gentle electrical pulses to the nervous system, but they are designed for very different people.

  • Implanted VNS treatment requires surgery to insert a pacemaker-like nerve stimulation device under general anaesthesia and is usually reserved as a last resort for those who have already tried multiple antidepressants and electroconvulsive therapy without success.

  • Flow tDCS is a certified medical device for treating depression that is worn entirely on the outside of the body. Flow is an evidence-based treatment suitable for a far wider range of people with depression compared to VNS, and carries minimal side effects with no surgical risk.
men wearing tdcs flow neuroscience device

taVNS vs implanted VNS: not the same treatment

Transcutaneous vagus nerve stimulation (taVNS) should not be confused with implanted VNS:

  • taVNS does not directly connect to the vagus nerve and instead involves external use of a stimulation device often attached to the ear.

  • There is currently a lack of evidence to support the use of taVNS as a standalone treatment for depression.

If you want to learn more about how tDCS works or read our full guide to vagus nerve stimulation and how it compares.

Important

The Flow headset is a CE-marked Class IIa medical device indicated for moderate to severe major depressive disorder in adults aged 18 and over. It is not a substitute for professional medical advice. Always consult a qualified healthcare professional before starting any new treatment.