Should I Continue Eptoin 100 For Blackout If It Is Causing Drowsiness?

While driving late in the night I met with an accident due to some sort of blackout or drowsiness. My doctor, a neurologist has advised me take Eptoin 100 (one in the morning and 2 in the night) for a long time, initially for three months. My MRI scan and EEG of brain are normal. I am also taking Nebi 2.5.mg and Loprin 75 mg for B.P. (normally around 120-130/80-85). The above medicine is causing drowsiness which I fear may hamper my daily activity. Kindly advise whether I should still continue Eptoin 100.