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Azithromycin is effective in reducing the symptoms of travellers' diarrhoea, particularly if taken with loperamide. This is an off-label use of azithromycin, but it has been prescribed for travellers' diarrhoea for many years. The symptoms of travellers' diarrhoea should improve within 24 hours of starting antibiotic.

It is recommended that you consider carrying standby antibiotics for travellers' diarrhoea:

• If you are going to a remote location with little or no access to good medical assistance.
• If you are at high risk of the diarrhoea leading to severe illness, e.g. poorly controlled diabetes, renal impairment, heart failure, reduced CD4 HIV or other reduced immunity.
• If you have a pre-existing bowel problem where infection may trigger a relapse, e.g. ulcerative colitis, Crohn's disease, coeliac disease, and previous bowel surgery.
• If you have a known tendency to severe travellers' diarrhoea.

Dosage

Treatment with azithromycin is 500mg daily for 3 days (either 2 x 250mg tablets or 1 x 500mg tablet). Start as soon as you get diarrhoea, not before. It is not a preventative.

Cautions

If you have known allergy to azithromycin, erythromycin, or clarithromycin you should not take azithromycin for travellers' diarrhoea.

There are some medical conditions where you should not take azithromycin:

• A tendency to irregular heartbeat or other heart disease.
• Myasthenia gravis.
• Liver disease.
• Kidney disease.

It is not recommended to take azithromycin when trying to conceive, or during pregnancy and breastfeeding, without first discussing with your own GP. See Best use of medicines in pregnancy - Azithromycin for further information.

Azithromycin tablets contain lactose.

Other medicines

There are several medications which should not be used at the same time as azithromycin. Not many of them are prescribed frequently so most people should be able to use it. Consult your own GP if taking:

• Ciclosporin - for reducing immunity after transplant.
• Digoxin - for irregular heart or heart failure.
• Ergotamine - for migraine used rarely.
• Terfenadine - antihistamine for hay fever and allergy.
• Theophylline - for asthma used rarely.
• Disopyramide, Amiodarone, Sotalol or other medication for irregular heart.
• Rifabutin - anti-tuberculosis antibiotic used rarely
• Promethazine (including Avomine) - NOT to be taken at the same time as azithromycin.
• Colchicine - for gout and familial Mediterranean fever.
• Warfarin, edoxaban, ticagrelor, or any similar medicines - to prevent blood clots.
• Talazoparib, topotecan - specialist cancer drugs.
• Antidepressant or antipsychotic medication.
• Quinolone antibiotics, e.g. moxifloxacin, levofloxacin, ciprofloxacin.
• Antacids - for indigestion, azithromycin can be taken but leave at least 2 hours after taking the antacid.

There is a very rare theoretical risk of abnormal heart rhythm if azithromycin is taken at the same time as some other medications - please check this list.

Side effects

If there are any side effects the most common are stomach upset, headache, nausea, and diarrhoea. For more details see the patient information leaflet supplied with the tablets.

Seeking help

Symptoms should start to improve within 24 hours of starting azithromycin. Medical advice should be sought if symptoms are not improving after 2 or 3 days, or are worsening, or if any of the following occur:

• Profuse diarrhoea and vomiting leading to dehydration.
• Blood and green or yellow slime in the motions with severe abdominal pains.
• Diarrhoea associated with rashes.
• High fever and headache with diarrhoea (particularly in malarial areas).

Managing the symptoms of diarrhoea

• The antidiarrhoeal loperamide can also reduce symptoms.
• Try to get plenty of rest.
• Drink plenty of fluids, even if vomiting (at least 3-4 litres daily).
• Continue to eat simple foods such as rice and dried bread, appetite permitting.
• Pay attention to personal hygiene, to prevent spread.

Antibiotic guardianship

To combat antibiotic resistance please:

• Only use antibiotics when needed
• Never share antibiotics
• Always complete course as instructed
• Take unused medicine to local pharmacy for disposal

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