Barry drank quite a lot at the biggest party of the year. later, he had trouble falling asleep, so he took a barbiturate. if he dies from respiratory failure during the night, it is probably because the alcohol and barbiturate had:

Barry drank quite a lot at the biggest party of the year. later, he had trouble falling asleep, so he took a barbiturate. if he dies from respiratory failure during the night, it is probably because the alcohol and barbiturate had a synergistic effect.An effect arising between two substances that produces an effect greater than the sum of their individual effects.