The body has a mechanism that says how fast stuff should be flowing through the gut.
Normally things slow down and speed up as needed, kind of like pressing the gas and brake pedals in a car.
Opiates affect this process so that your body is pressing on the brakes all the time. This results in things moving much slower than they should. The result of this is very hard stool that the body has a hard time moving, even if you take something that presses the gas pedal.
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