Traveler's Diarrhea · Azithromycin
Most people improve within about 24 hours of taking azithromycin for traveler's diarrhea, and many feel substantially better sooner. A single 1,000 mg dose often resolves it; some clinicians use 500 mg daily for 3 days. It works because it directly treats the bacteria causing the illness.
| Question | Answer |
|---|---|
| How fast you feel better | Often within 24 hours, sometimes sooner |
| Standby dose | 1,000 mg single dose, or 500 mg daily for 3 days |
| When to start it | Only if diarrhea is moderate to severe during travel |
| If no better in 24 to 48 hours | Seek in-person care |
Add loperamide (Imodium) for symptom control and, most importantly, keep up with oral rehydration. Loperamide should not be used by itself if you have a fever or bloody stool.
You carry azithromycin and take it only when you actually get sick with disruptive diarrhea. It is not a daily preventive, and it is not for the mild, brief loose stool that settles on its own in a day. Using it for every minor gut grumble just wastes the medicine and is not recommended.
If you do not clearly improve within 24 to 48 hours, or you have high fever, blood in the stool, severe belly pain, or signs of serious dehydration, do not keep relying on the standby antibiotic, get in-person care. Those features can mean something the standby course will not fix.
Bidwell Health can prescribe a standby course of azithromycin online before your trip, when it is clinically appropriate, so it is in your bag if you need it.
Most people improve within about 24 hours of taking azithromycin for traveler's diarrhea, and many feel substantially better even sooner. A single 1,000 mg dose often resolves it; some clinicians use 500 mg daily for 3 days.
The standby dose is either a single 1,000 mg dose or 500 mg once daily for 3 days. You start it only if you develop moderate to severe diarrhea during travel. The exact plan is set during your visit.
If your diarrhea has not clearly improved within 24 to 48 hours of starting azithromycin, or you develop high fever, blood in the stool, or severe dehydration, stop relying on the standby antibiotic and seek in-person medical care.
Loperamide (Imodium) can be added for symptom control and works well alongside azithromycin, but it should not be used alone if you have a fever or blood in the stool. Oral rehydration is the most important part of treatment either way.