Why do drugs that do the same thing have different side effects in the same person?
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Doing the same thing isn’t the same as doing different things and getting a similar result. For example, if you want to have a weight loss medication: you could have one that surpasses your appetite, drug A. This would cause a person to eat less potentially by increasing the production of the hormone that tells you you are full, which results in less incoming calories, therefore a calorie deficit, therefore weight loss. On the other hand, you could have a medicine, drug B, that increases your heart rate and dopamine. Which might cause someone to have a lot of energy and be hyper. Increase in passive muscle activity causes an increase in calorie use, which leads to a calorie deficit, and also leads to weight loss. Now, drug A messes with the hormones that control your digestive tract, so it might also mess with other things like nutrient absorption or stomach muscles (cramping, constipation, etc.) Where as drug B increases muscle activity so you might get heart palpitations, or muscle spasms. Same end result, different routes to get there, different side effects.
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