Why do so many prescription drugs cause drowsiness?

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Seems like so many of them have a warning to exercise caution while driving or operating equipment as it “may cause drowsiness”. Why is this a common side effect?

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2 Answers

Anonymous 0 Comments

While there are probably shared mechanisms in a lot of drugs, much of this is due to how sideeffects are counted. If you are in a drug trial, and you are given the actual drug rather than the placebo, /anything/ you experience is logged as a side effect. They look for statistically significant side numbers and if the symptom hits that number, it gets logged as a side effect. There’s often no easy way to determine whether it’s the drug or some other factor causing the side effect, so it gets logged as a potential side effect of the drug. Many people are often tired, so if they are tired while taking the drug, they’ll attribute it to the drug.

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