• Acetazolamide


Medication features

  • Used in prevention / treatment of altitude sickness
  • Will not relieve all symptoms, other steps required
  • Generic of Diamox


Acetazolamide 250mg online

You can request to buy acetazolamide, which is the generic version of Diamox, online. Acetazolamide is used in the prevention and the treatment of acute altitude sickness. After completing an online assessment, our doctor will review your order and make sure the medication is suitable for you. If approved, a prescription will be passed to our pharmacy to dispense and dispatch to your chosen delivery address.

Our doctors prescribe this medication for 'off-label' use. 'Off-label' means the medicine is being used in a way that is different to how it's described in the medical license of the product. You can read more information here. 


  • What is Diamox?

    Diamox is a medication used in the prevention and treatment of acute altitude sickness.

  • What is the ingredient in Diamox?

    The active ingredient in Diamox is acetazolamide 250mg.

  • How do I reduce the symptoms of altitude sickness?

    If you think you have altitude sickness, you should take the following actions;

    • stop and rest where you are
    • don't go any higher for at least 24-48 hours
    • drink plenty of water
    • avoid alcohol or smoking
    • avoid exercising
    • if you have a headache, take ibuprofen or paracetamol
    • if you feel sick, take an anti-sickness medication, such as promethazine / phenergan
  • What medications prevent altitude sickness?

    Acetazolamide is the medication most commonly prescribed in the prevention and treatment of altitude sickness

  • How do I take Diamox / Acetazolamide to prevent altitude sickness?

    The dosage is usually one tablet 1 to 4 times daily.

    To prevent altitude sickness

    • Start taking acetazolamide 1 to 2 days before your climb.
    • Continue taking it while you are climbing and for at least 48 hours after you have reached your final altitude.
    • To control your symptoms, you may need to continue the medication if staying at the high altitude

    Acetazolamide may be taken with or without food.

    You shuold drink plenty of fluids unless otherwise directed by your doctor. 

  • How does Diamox work?

    Acetazolamide is a diuretic (water pill), however the actual mechanisms by which acetazolamide reduces symptoms of altitude sickess remain unclear. Several factors are thought to affect how Diamox works, including

    • metabolic acidosis resulting from renal CA inhibition
    • improvements in ventilation from tissue respiratory acidosis
    • improvements in sleep quality from carotid body CA inhibition
    • effects of diuresis.

Side Effects

Side Effects of Acetazolamide

  • headache
  • diarrhoea
  • feeling or being sick
  • loss of appetite / thirstor / metallic taste in the mouth
  • dizziness, loss of full control of arms or legs
  • looking flushed
  • need to pass urine more often than normal
  • tiredness / irritability
  • feeling over-excited
  • a tingling or numbness in the fingers or toes, or coldness in the extremities.

Please read the patient information leafelet for a full list of side effects.


Info Leaflet

Before buying or taking any medication – it is important you read the Patient Information Leaflet (PIL)

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