Treatment sequences for two-week treatment periods with placebo and three dosage levels of piracetam in nine patients (this sequence was repeated once to allow inclusion of 18 patients)
| 1 | 2 | 3 |
|---|---|---|
| X | A | B |
| X | B | C |
| X | C | A |
| A | X | C |
| B | X | A |
| C | X | B |
| A | C | X |
| B | A | X |
| C | B | X |
X = placebo; A = 9.6 g piracetam; B = 16.8 g piracetam; C = 24 g piracetam.