Opiates suppress the breathing drive in your brain. Taking too much heroin (or oxycodone, fentanyl, morphine, or any other opiate) will make it so that you barely breath at all, or possibly stop breathing entirely. The amount of oxygen in your system will drop, and the amount of carbon dioxide will rise. The rising carbon dioxide makes your blood more acidic. Some parts of the body are more able to withstand low oxygen and high levels of acid than others. As it turns out, your brain does very poorly when deprived of oxygen. Even if someone finds you and revives you in time to keep you from dying, there is a chance you may suffer a permanent brain injury from the lack of oxygen during an overdose. But if no one finds you and revives you, and the oxygen levels keep dropping, and the acid levels keep rising, the next major organ to really suffer is going to be the heart. Your heart muscle doesn't work well without oxygen and with too acidic of an environment. At some point your heart stops pumping blood, and then you die
Most people who overdose on heroin don’t feel anything. Nodding off or falling asleep after using heroin is common, so many people say they felt like they were falling asleep right before they overdosed. If you’ve ever received anesthesia before a surgery, it’s likely a similar experience. Within a few seconds of receiving the drug, you’re asleep.
If you are worried about if they were in pain or anything the answer is probably not as they were unconscious
Most people who overdose on heroin don’t feel anything. Nodding off or falling asleep after using heroin is common, so many people say they felt like they were falling asleep right before they overdosed. If you’ve ever received anesthesia before a surgery, it’s likely a similar experience. Within a few seconds of receiving the drug, you’re asleep.
If you are worried about if they were in pain or anything the answer is probably not as they were unconscious
