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Acetazolamide 250mg (Single Tablets)

Stock Item  |  Usually dispatched within 24 hours

This product requires a prescription. If you don't already have one, please fill in an online consultation, charged at £5.

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Acetazolamide 250mg Tablets (Diamox), are a weak diuretic, often used for the prevention of altitude sickness.

Often used to treat glaucoma but also used to prevent Altitude Sickness. Its ability to acidify the blood increases ventilation of the lungs which in turn helps prevent altitude sickness from developing.

This medicine is being used "off-label". This means that it is not being used for its licenced indication (Glaucoma). It is however commonly prescribed for altitude sickness prevention.


The usual dose is half to one tablet twice daily, (125mg-250mg twice daily). This is usually started one to two days before ascent and until you have reached your highest point or are suitably acclimatised. They can be ordered either by using our Online Consultation Service (Consultation - Altitiude sickness) or by sending in a private prescription that you may have obtained from your GP (I Have a Prescription).


Each tablet contains 250mg acetazolamide. Also contains dicalcium phosphate, corn starch, magnesium stearate, sodium starch glycolate, povidone.


Do not take Acetazolamide tablets if you know you are allergic to sulphonamides, sulphonamide derivatives including acetazolamide or to any of the ingredients inthe medicine. Avoid these tablets if you have severe liver problems, or have ever had severe liver problems, or if you have a particular type of glaucoma known as chronic non congestive angle closure glaucoma, or if you have reduced function of the adrenal glands, or if you have low blood levels of sodium and/or potassium or high blood levels of chlorine.

* We don't sell food to non-UK addresses
** Includes N.Ireland, Scottish Highlands, UK Offshore Islands, Isle of Man, Scilly Isles


UK, Channel Islands, N Ireland, Highlands and Islands - Standard delivery arrives 2-3 days after dispatch or for heavy parcels Courier next day after dispatch Mon-Thu.
Europe - We no longer send orders to European or International destinations.


Express delivery arrives 1-2 days after dispatch or for heavy parcels Courier 1-2 days after dispatch Mon-Thu.


Light parcels, delivered Tue-Fri, signature required or for heavy parcels Courier next day Mon-Thu delivery after dispatch.


We understand that you may want, at times, to return an item you’ve purchased from us. To make this process quick and convenient for you, please read the policy below.


We regret that we cannot, by law, accept returns of any medication. If you return a medicine to us all we can do is dispose of it correctly for you as it cannot be resold.

Of course, if we have made a mistake or the product is faulty or damaged, we will accept returns as long as you contact us within 10 days of receiving the order and received the product back within 30 days. Once we have received the returned item  we will refund the amount paid or resend the product.


If for whatever reason you are not satisfied with any other item you have purchased from us, you may return it if you notify us within 10 days of receiving the order and we receive the product back within 30 days. Once we have received the returned item we will refund the amount paid or resend the product.


All returned products must be in their original packaging, unopened and in a re-saleable condition. We only accept returns for products that have been purchased through us.

Any return which does not meet the conditions set above will not be refunded or replaced.

Customer errors: Customers are humans and make mistakes. Sometimes customers put the wrong address in on their order. We are happy to re-ship the item when it is returned to us by Royal Mail. This may take upto 28 days depending on the error made.

Non-Delivery: If an item remains undelivered within 7 working days (exc Sat-Sun) from dispatch then the customer needs to check with their local delivery office/post office for uncollected items.

For further information on returns or to request a refund/return, please contact us.

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