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I think it’s not uncommon for a drug treating some condition with some symptom to have a potential side effect that worsens that symptom. When you start playing with some set of receptors, it’s possible something goes too far or, for whatever reason, not far enough and now we’re worse off

See: antidepressants can increase suicidal ideation, cannabis (used for nausea) can cause nausea at higher doses, etc.

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> I think it’s not uncommon for a drug treating some condition with some symptom to have a potential side effect that worsens that symptom.

I think you're making the error of conflating probabilities here. It's not uncommon for drugs to have uncommon side effects, but those side effects are still uncommon. Every once in a while benadryl makes a person paradoxically excited, but most people who take benadryl get sleepy.

As an occasional user, can confirm that motion sickness pills (e.g. Cinnarizine, one of the most used in the British Navy) make dizzy, some more than other, and that it’s still much better overall than not taking them.

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