Acetazolamide (also known as its previous brand name Diamox) is a prescription medicine used to alter the blood acidity to help breathe easier and reduce fluid in the lungs and around the brain.

Acetazolamide tablets do this by increasing the production of urine in the body. Buy acetazolamide tablets online on prescription from a registered UK doctor & pharmacy service.


Complete a short consultation before selecting your medication. All our consultations are approved by a UK Medical Doctor.


Summary of available medications

Medication Quantity Price
Acetazolamide (Diamox) 28 to 112 tablets From £29.99

All medications

Acetazolamide (Diamox)

Medication Quantity Price
Acetazolamide (Diamox) 250mg 28 tablets £29.99
Acetazolamide (Diamox) 250mg 56 tablets £54.99
Diamox (Acetazolamide) 250mg 112 tablets £99.99


All prices exclude prescription fee


Acetazolamide (Diamox) can be used to prevent and treat high altitude sickness although its licensed use is for other illnesses such as epilepsy and glaucoma.

Diamox contains acetazolamide but Diamox is no longer available in the UK.
DrFelix supplies Acetazolamide, each tablet contains acetazolamide 250mg.

Take ONE 250mg tablet twice daily for rapid force ascents and early acute mountain sickness.

Take HALF a tablet twice daily for altitude related disturbances.

Acetazolamide Side Effects

Common side effects of Acetazolamide include nausea, vomiting, diarrhoea, taste disturbance, loss of appetite, paraesthesia (tingling sensation), flushing, headache, dizziness, fatigue (tiredness), irritability, depression, thirst and reduced libido.

Other less common Acetazolamide side effects include drowsiness, confusion, hearing disturbances, fever, blood in urine or stools, kidney or liver problems and skin rash. If these symptoms occur, discontinue use and contact your doctor.

In very rare cases Acetazolamide can cause hepatitis, jaundice, convulsions, sensitivity to light, flaccid paralysis.

Refer to the Acetazolamide pamphlet inside the box for more information.