Concomitant use w/ alcohol; medicines for anxiety or sleep disorder eg, alprazolam, diazepam, chlordiazepoxide, temazepam, triazolam; medicines for depression (eg, amitriptyline, doxepin, nortriptyline, fluoxetine, sertraline, paroxetine); possibility for increased toxicity w/ other cold or allergy medicines or medicines that cause drowsiness, sleepiness & relaxation.