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.