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Transcranial direct current stimulation (tDCS) side effects frequency among former crystalline-heroin users (n = 20 in each group)
| Side effects | Anode right/cathode left | Cathode right/anode left | Sham |
|---|---|---|---|
| Headache | 8 | 10 | 14 |
| Vertigo | 6 | 5 | 2 |
| Tingling | 9 | 10 | 10 |
| Itching | 5 | 8 | 13 |
| Dizziness | 6 | 5 | 2 |
| Drowsiness | 10 | 8 | 1 |
| Nausea | 2 | 1 | 0 |
