FAA guidance
Do not fly while taking it.
Wait
At least 5 dosage intervals after the last dose (over-the-counter guide)
FAA label
NO GO
The FAA's over-the-counter guide lists loperamide (Imodium) in its Avoid (No Go) column, among products it says can cause incapacitation, and says that if you take any of its No Go medications you should wait at least five dosage intervals after the last dose before flying.
Track your medicationsMore detail: loperamideThe rest of Crosscheck's reading, in plain wordsOpen
It notes that loperamide should not be used during acute illness as it can cause dizziness, and that when taken daily for a chronic condition it may require a special issuance. It notes that GI illness can cause dehydration, cramps and pain with increase in altitude.
Show the FAA's words: loperamideThe official FAA wording: two passages, each with its document and dateOpen
AVOID
These can cause incapacitation.
NO GO
loperamide (Imodium)
GI illness can cause dehydration, cramps, and pain with increase in altitude. NOTE: Loperamide should not be used during acute illness as it can cause dizziness. When taken daily for a chronic condition, it may require a special issuance.
4. NO GO Medications:
If you take any of the NO GO medications listed in the OTC Medications Reference Table OR if you have previously had side effects from the medication, wait at least five (5) dosage intervals after the last dose before flying.