Traveler's Diarrhea · Azithromycin
Improvement can occur within a day, but it is not guaranteed. When diarrhea is caused by bacteria susceptible to the chosen antibiotic, treatment can shorten illness by about 1 to 2 days. Azithromycin will not fix every cause of diarrhea. Follow the prescribed standby plan and seek care if you are not clearly improving within 24 to 48 hours, or sooner for warning signs.
| Question | Answer |
|---|---|
| How fast you feel better | Can improve within a day; response varies by cause and antibiotic susceptibility |
| 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.
Improvement can occur within a day, but it is not guaranteed. When diarrhea is caused by bacteria susceptible to the chosen antibiotic, treatment can shorten illness by about 1 to 2 days. Azithromycin will not fix every cause of diarrhea. Follow the prescribed standby plan and seek care if you are not clearly improving within 24 to 48 hours, or sooner for warning signs.
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.
Mild: tolerable and does not interrupt planned activities; antibiotics are not recommended. Moderate: distressing or interrupts activities; an antibiotic may be appropriate under your travel plan. Severe: incapacitating or prevents activities; medical care and antibiotic treatment may be needed. Bloody diarrhea is severe regardless of stool count. Antibiotics can cause side effects, C. difficile infection and resistant-bacteria carriage. CDC treatment guidance.
Get care promptly for bloody stool, high fever, severe abdominal pain, inability to keep fluids down, very little urine or marked dizziness. Confusion or fainting needs urgent help. Do not wait 24 to 48 hours when warning signs are present. A fever during or after travel in a malaria area also needs urgent assessment, even if you took prevention pills.
CDC Yellow Book: travelers’ diarrhea