There were mainly 2 reasons given in this thread and I’ll add a third one:
1) Body has many mechanisms that work on molecular level and most molecules affect multiple systems, or one system’s distruption could affect other systems. (Morphine causing constipation)
2) Too much of a molecule causes too much of an effect (Blood pressure medicine causes very low blood pressure and shock)
3) Balance mechanisms try to balance a drug’s effect when it’s in the body, and when drug is out of the body balance is distupted towards the other way (First you drink too much caffeine to feel over energetic and after a while you drink coffee to feel normal and feel tired more than usual when you don’t drink it)
Latest Answers