Hello again, nbf6. 
Learning about pheromones and how to use them is a process and takes some time. So, in that respect, no, they’re not “Instant”. Unfortunately, pheromones aren’t magical potions. They can’t do the work for you. It’s more about you learning how to work the pheromones in order to get the best “effect”. 
And the best place to start learning about the whole process, for all newbie’s, is by reading the sticky threads at the top of each forum. The answer to many a newbie question is already answered there. Taking the time to read them can be immensely helpful and will give you a better understanding of how all this really works.
Here is one of the many excellent sticky threads to get you started. Happy reading! 
https://pheromonetalk.com/t/what-pheromones-can-do-and-what-they-cant-updated/9558
Bella