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.