1.   But now the product, and similar herbal stimulants, is the target of an increasingly determined campaign to ban it from store shelves.

2.   Chemically, chocolate contains the alkaloid theobromine, a mild stimulant similar to caffeine that opens blood vessels and stimulates the heart.

3.   The plant contains a deadly heart stimulant similar to the drug digitalis.

4.   The IOC medical commission said bromantan was a performance-enhancing stimulant similar to amphetamines.