Results from two separate studies were combined to compare the acute and subchronic effects of two monoamine oxidase-A (MAO-A) inhibitors, moclobemide and brofaromine, on actual driving performance and sleep. Both studies were conducted according to a double-blind, crossover design involving 18 patients receiving moclobemide and 16 patients receiving brofaromine. Patients were administered either moclobemide 200 mg b.i.d., mianserin 10 mg. t.i.d., and placebo (study 1), or brofaromine 50 and 75 mg b.i.d., doxepin 25 mg t.i.d., and placebo (study 2) for 8 consecutive days. A standardized driving test was conducted on day 1 and day 8 of treatment. Daily logs of estimated sleep duration and quality were obtained. Neither moclobemide nor brofaromine impaired driving performance. Some indication, although statistically not significant, was found that moclobemide improved driving performance on day 1. Brofaromine 75 mg significantly improved driving performance on day 8 of treatment. No significant difference between the effects of both drugs was found in a cross-study comparison. Moclobemide did not affect any sleep parameter, whereas brofaromine shortened sleep duration and decreased sleep quality. On day 1, mianserin and doxepin impaired driving. Impairment dissipated after 8 days of treatment with doxepine but not during treatment with mianserin. Sleep duration was prolonged during treatment with both drugs, whereas sleep quality remained unaffected. It is concluded that both MAO-A inhibitors are safe drugs with respect to driving.