Figure 7.

Subjective Sedation Measured by Visual Analogue Score. This figure shows the effect of the five treatments on the visual analogue score (VAS) given to the statement, "I feel drowsy". The VAS was expressed as the mean score of all volunteers (n = 10) when a steady serum concentration of the treatment drug had been achieved. All drug treatments were associated an increase in VAS compared to saline. The serum concentrations targeted are listed in Table 1 and enumerated on the abscissa using a logarithmic scale.