He didn't even know how quickly the drug would act.

"When many drugs act together," he said, "they may often have unpredictable and dangerous effects."

This supplement may change the way certain drugs act in the body.

Sometimes one medicine you are taking changes the action of another medicine, or the drugs act together to create unexpected side effects.

These drugs primarily act through by being an anticholinergic agent.

Another was that the drug, in theory, might act faster than others.

But the two drugs act by different biological mechanisms.

The end result is that the drug acts as a switch, turning the ribozyme on and off.

Until about a year ago, nobody was convinced that drugs acted differently in men and women.

She had not thought the drugs would act so quickly.