What are the effects of drug addiction, especially opioids?

The effects of having withdrawals from opioids include Pain in the muscles, diarrhea, vomiting, or nausea, restlessness or sweating, general discontent or anxiety, dilated pupil or watery eyes, cramping abdominal pain, fast heart rate, excessive yawning, goose bumps, insomnia, or tremor.

the more fit you are, the faster the recovery. your heart rate drops most sharply in the first minute after you stop exercising; it should then fall about 20 beats a minute—a drop of less than 12 beats a minute is considered abnormal. this “recovery heart rate” is measured as part of an exercise stress test.