They also can surgically implant a naltrexone pellet, lasting for about 6 months. Costs about $350 here in Texas.
Usually after about 10 minutes, depending on the pill, its been broken down and absorbed into the bloodstream. Of course this is changed depending on if he's eaten or not, and if the pill contains a substance to create a time release of the medication. Beating an opiate addiction is difficult.
You said you knew nothing about heroin or naloxone. Heroin is a refined form of morphine, which is the main alkaloid in opium, accounting for approx. 10% of its weight. Morphine is extracted from opium using lime, and then ammonia. (Theres more, but thats the jist) Heroin, by the time it reaches the end user, has been cut many times, and is relatively impure. What your son was shooting up was maybe 20-30% heroin of approx. 80-90% purity, and the rest was cutting agent, such as mannitol or lactose. Heroin, Morphine, Codeine, etc. are all in the narcotic category of psychoactive drugs. They bind to opiate receptors in the brain and CNS, producing euphoria, as well as other effects. Tolerance develops quickly as the brain produces more "pseudo" receptors that do not work. Withdrawal is severe, but rarely fatal as with benzodiazapines.
As mentioned above, naloxone binds to the opiate receptors in the brain, stopping opiates and opioids from binding to them. Such a substance can be used to instantly reverse an opiate overdose, if its not too late.
nalaxone (spelling) is an opiate blocker, wich blocks him from getting high (if he tries anyway) so if he buys heroin itl be a waste of money....