I believe the tranquilizers are controlled narcotics or otherwise are controlled substances. A lot are ophioids. Unless you are a vet or animal control officer, good luck in getting access to the medication. Note that some animal tranquilizers are illegally used by people.
How long it takes the animal to go down depends on numerous variables including the type of tranquilizer, amount, where the animal was injected, type and size of animal, attitude of the animal. They can start to work almost immediately, but generally take a few minutes to take affect as the medication usually is darted into a muscle and then it must disperse from the muscle tissue. This is a much slower process than a direct vein injection as you might get for a surgery (either you or your pet).
The dangers come in what happens between the time of injection and when the medication puts down the animal, whether the animal goes down properly (correct dosage), is killed by the tranquilizer, or isn't tranquilized enough and hurts the human handlers. Improperly tranquilized animals have a nasty habit of waking up at inopportune times.
Edited by Double Naught Spy (05/16/16 10:22 AM)