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This in fact is nothing to do with physical attraction; it instead makes people in the vicinity to want to go to this area. It works using a spray instead of the standard injection method.
The pheromone drugs take the form of 1 ½ long metal cylinder, with one smooth, rounded end, and another flat one. The pheromone drug can be either drunken, or injected, which it allows by a chemical in the concoction which makes cells extremely absorbent. As such if you press the cylinder to your arm (or whatever part of your body you wish), and press the rounded end, your arm will quickly absorb the chemical, it will quickly reach the blood stream and come into effect. It can also be drunken by unscrewing the flat end and simply drinking it, the fluid being absorbed in the mouth or when going down the throat. It is rare for any of it to reach the stomach.
In the capsules the amount of the pheromone is measured very specifically, and if taking just that capsule, there should not be any problems, taking more than that can cause serious difficulties.