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Does over consumption of menthol cause sleepiness?

I found no substantial sources either to suport or refute this argument. I have heard it from a few sources not perfectly reliable.

I do know that consumption of cough drops does cause.

By over comsumption I mean taking 3/4 tablets per hour.

I am consuming "fishermen's friend" "extra stark" and want to check if it is true.

  • Everything that contains sugar can make you tired, because of sugar crashes. – Wertilq Apr 15 '13 at 9:56
  • I am skeptical that 10/15 I consumed within couple of hours would cause so much sleepiness. Maybe, but I would love to know menthol itself contributes. – 700resu Apr 15 '13 at 10:03
  • many things containing menthol also contain a lot of sugar, which can cause a sugar rush, followed by sleepiness. So it should not be surprising if people start linking the two, but get the causality wrong. – jwenting Apr 15 '13 at 13:17
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No

At typical dosages, Menthol's side effects do not include drowsiness. They do include:

Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); redness or irritation at the application site. [source]

At overdose levels, Menthol's side-effects do not include drowsiness. They do include:

  • Bladder and kidneys
    • Blood in the urine
    • No urine output
  • Lungs
    • Rapid breathing
    • Shallow breathing
  • Gastrointestinal
    • Abdominal pain
    • Diarrhea
    • Nausea
    • Vomiting
  • Heart and blood
    • Rapid heartbeat
  • Nervous system
    • Convulsions
    • Dizziness
    • Tremor
    • Unconsciousness
    • Unsteady walking

[source]

Use medications according to the instructions. On average, they are more reliable than the Internet.

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