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Acetazolamide Tablets

Acetazolamide is an FDA-approved medication primarily used to treat glaucoma by reducing eye fluid and pressure. It’s also effective as a diuretic for managing fluid retention in congestive heart failure, alleviating certain types of seizures, and preventing altitude sickness. Available in tablets, extended-release capsules, and injection forms, it must be used under strict medical guidance due to potential interactions with various medications like aspirin, methenamine, and antivirals, among others. Appropriate dosages of this medication vary based on the condition treated and patient response, with specific guidelines for children and adults. So, if you want to buy Acetazolamide 250mg online, you need your healthcare provider’s prescription.

Product Overview

Acetazolamide serves multiple therapeutic purposes. Primarily, it reduces intraocular pressure in patients with glaucoma, thereby preventing optic nerve damage. As a carbonic anhydrase inhibitor, it decreases fluid production within the eye. This mechanism also allows it to act as a diuretic, aiding in a fluid reduction in cases of congestive heart failure and certain edema types. Furthermore, Acetazolamide is beneficial in controlling some seizure disorders and is crucial in preventing and treating altitude sickness by helping the body of an individual adjust to higher elevations.

The drug is available in several forms, including 125mg and 250mg tablets, 500mg powder for injection, and a 500mg extended-release capsule. The dosing is condition-specific and must be carefully adjusted by healthcare providers. For example, the recommended starting dose for glaucoma might be 250mg daily, which can be adjusted based on the patient’s response and the severity of the condition. For altitude sickness prevention, dosages range from 500 to 1000 mg in divided doses, initiated 24-48 hours before ascent.

However, Acetazolamide can interact with a variety of other medications, necessitating caution. It is contraindicated with aspirin and methenamine and requires dosage adjustments or close monitoring when used with medications like acyclovir, amphetamines, and furosemide. Patients must disclose all other medications they are taking, including over-the-counter drugs and supplements, to avoid adverse interactions. Patients need to follow their doctor’s instructions regarding dosage and administration. Long-term use can lead to decreased effectiveness, requiring dosage adjustments. It’s also important for patients to monitor for signs of side effects, such as dizziness, changes in vision, or signs of electrolyte imbalance, and report them promptly to their healthcare provider. You can also buy Acetazolamide for glaucoma from a top Canadian pharmacy at an affordable price.

Uses of Acetazolamide

Acetazolamide is used/prescribed:

  • For individuals with certain types of glaucoma, it helps reduce the amount of fluid in their eye, which in turn decreases the pressure inside the eye.
  • As a diuretic, commonly known as a “water pill,” for people with congestive heart failure, this helps reduce the buildup of fluid in the body, a condition known as edema.
  • In the treatment of certain types of seizures, providing relief by managing the symptoms.
  • Treating or preventing altitude sickness aids individuals in adjusting to high altitudes more comfortably. 
  • For other medical conditions not listed in the standard medication guides. Always consult your professional healthcare provider for more detailed information and appropriate usage.

How to Use Acetazolamide?


It comes in the following forms and strengths:

  • Tablet: 125mg, 250mg
  • Powder for Injection: 500mg
  • Extended-release, Capsule: 500mg

Recommended Dosage for Different Patients

Dosage for Edema Caused by Other Medicines

  • For Adults: Take 250 to 375 mg once a day for one or two days, alternating with a rest day.
  • For Children: The doctor must determine the appropriate use and dosage.

Dosage for Congestive Heart Failure

  • For Adults: Start with 250 to 375 mg once daily in the morning. Your doctor or healthcare provider may adjust the dosage based on your response.
  • For Children: The doctor must determine the appropriate use and dosage.

Dosage for Mountain Sickness

  • For Adults: Take 500 to 1000 mg in divided doses. Start taking it 24 to 48 hours before climbing and continue for 48 hours at a high altitude or as needed.
  • For Children: The doctor must determine the appropriate use and dosage.

Dosage for Seizures (In Combination with Other Anticonvulsants)

  • For Adults: Start with 250 mg once a day. Your doctor may adjust the Acetazolamide dosage based on your response.
  • For Children: The doctor must determine the appropriate use and dosage.

Dosage for Open-Angle Glaucoma

  • For Adults: Start with 250 mg per day. Your doctor can adjust the dosage if necessary, but usually not exceeding 1 gram (g) per day.
  • For Children: The doctor must determine the appropriate use and dosage.

Dosage for Seizures (Acetazolamide Alone)

  • For Adults: The dosage is based on body weight & it will be determined by your primary caregiver. Typically, the dose ranges from 8-30 mg per kilogram of body weight, which is taken in divided doses. The maximum daily dosage usually does not exceed 1 gram (g).
  • For Children: The doctor must determine the appropriate use and dosage.

Dosage for Secondary and Acute Closed-Angle Glaucoma

  • For Adults: Take 250 mg every 4 hours or twice a day. Your doctor can adjust the Acetazolamide dosage as needed.
  • For Children: The doctor must determine the appropriate use and dosage.

[Note: Remember these recommendations can vary depending on person to person. You should discuss it with your doctor, and they’ll customize your Acetazolamide dosage accordingly.]

How to Take It?

  • If you are using the tablet form of Acetazolamide, take it orally as your doctor instructs, typically one to four times daily. For the long-acting capsules, they should also be taken orally as directed, usually once or twice daily. 
  • It is important to swallow these capsules whole; do not open, break, or chew them, as it can disrupt the medication’s time-release mechanism and potentially increase side effects.
  • You can take Acetazolamide with or without food. Drink plenty of liquids unless your doctor advises otherwise. The dosage you receive may depend on your specific medical condition & how you respond to the treatment.
  • To prevent altitude sickness, start taking Acetazolamide one to two days before beginning your ascent. Continue taking it throughout your climb and for at least 48 hours after reaching your highest altitude. 
  • If you stay at a high altitude, continue using the medication to manage symptoms. If you experience severe altitude sickness, it is important to descend to a lower altitude quickly, as Acetazolamide does not protect against the severe effects of altitude sickness.
  • If you are taking Acetazolamide for other conditions, such as glaucoma or seizures, it’s important to use this medication regularly as prescribed to achieve the best results. 
  • Taking it at the same time each day can help you remember. To avoid nighttime urination, try to take your last dose in the early evening.
  • Do not increase your dosage or take this medication more often or for a longer duration of time than prescribed. Doing so will not improve your condition faster and may increase your risk of side effects.
  • If you use Acetazolamide for an extended period, it may become less effective & require different dosing. Your doctor will monitor your condition regularly. Inform your doctor or pharmacist if your condition does not improve or if it worsens, such as experiencing more frequent seizures.
  • This medication can lower the potassium levels in your blood. To counteract this, your doctor might advise you to eat potassium-rich foods like bananas or drink orange juice. A potassium supplement might also be prescribed. Always follow your doctor’s recommendations regarding diet and supplements.
  • If your condition persists or worsens, make sure to inform your doctor. Regular communication with your doctor, pharmacist, or healthcare provider is essential to ensure the effective management of your condition with Acetazolamide.

[Note: Your doctor or healthcare provider will decide the amount for you based on your condition, following guidelines & studies on the drug. They’ll adjust it as needed over time.]

How Does Acetazolamide Work?

Acetazolamide is a medication classified as a carbonic anhydrase inhibitor, primarily used to reduce fluid production within the eye. Its mechanism involves decreasing the activity of an enzyme critical for fluid secretion, thus aiding in the treatment of certain eye conditions. Additionally, it is effective in alleviating fluid retention or edema, often associated with heart failure or the side effects of specific drugs. 

Important Safety Information

Side Effects

Common side effects of Acetazolamide may include:

  • Lightheadedness
  • Dizziness
  • Increased urination

Mild side effects of Acetazolamide may include:

  • Loss of appetite
  • Changes in taste
  • Dry mouth
  • Vomiting
  • Diarrhea
  • Nausea
  • Drowsiness
  • Blurred vision

Serious side effects of Acetazolamide may include:

  • Hearing loss
  • Signs of infection (like sore throat that doesn’t go away, fever, chills)
  • Decrease in vision
  • Unusual tiredness
  • Mental/mood changes (such as confusion, difficulty concentrating)
  • Muscle cramps/pain
  • Fast/irregular heartbeat
  • New or worsening eye pain
  • Easy bleeding/bruising
  • Symptoms of a very serious allergic reaction (like swelling, rash, itching, especially of the tongue, face, or throat, serious dizziness, & trouble breathing)
  • Ringing in the ears
  • Signs of kidney issues (such as pink or bloody urine, painful urination, change in the amount of urine)
  • Signs of liver issues (such as nausea & vomiting that doesn’t stop, stomach or abdominal pain, dark urine, yellowing eyes/skin)
  • Tingling of the hands/feet

While some people may experience mild side effects, serious side effects are less common but more severe. Always consult your healthcare provider if any side effects persist or worsen. This medication is prescribed because the benefits are deemed to outweigh the potential risks.

[Note: This list might not cover all potential side effects. It is advised to consult with your healthcare giver for medical advice about side effects.]


  • Cirrhosis: Avoid this medication if you have advanced liver disease.
  • Severe Liver or Kidney Disease: It is unsafe to use Acetazolamide if you have significant liver or kidney problems.
  • Electrolyte Imbalance: If you have an imbalance in your body’s electrolytes, such as unusual levels of potassium or sodium or acidosis, you should not take this medication.
  • Adrenal Gland Failure: This medication is not suitable for individuals with adrenal gland dysfunction.
  • Medical History: Discuss your medical history thoroughly with your healthcare provider before beginning treatment with Acetazolamide. Special attention should be given to any past medical conditions, particularly:
    • Diabetes.
    • Narrow-angle glaucoma.
    • Overactive thyroid gland (hyperthyroidism).
    • Disorders of the adrenal gland, such as Addison’s disease.
    • History of kidney or liver disease.
    • Imbalances in essential minerals like sodium or potassium or conditions such as hyperchloremic acidosis.
    • Gout.
    • Instances of dehydration.
    • Respiratory conditions include COPD (chronic obstructive pulmonary disease), emphysema, or lung infections.
  • Altitude Sickness: Acetazolamide is often used to help individuals acclimate to high altitudes and manage rapid ascents, but it is not a foolproof solution against severe altitude sickness. Suppose you experience severe symptoms such as significant shortness of breath, confusion, trouble concentrating, uncoordinated or staggering walking, extreme fatigue, or intense headaches. In that case, it’s crucial to descend to a lower altitude immediately to prevent serious and possibly life-threatening complications.
  • Impairment of Alertness: This medication can cause dizziness, drowsiness, and blurred vision. Alcohol or marijuana (cannabis) can exacerbate these effects. Therefore, it is advised that you should not drive, operate any machines, or perform any tasks that require sharp alertness or clear vision until you are certain that you can do so safely. You should also limit consumption of alcoholic beverages and discuss with your doctor the implications of using marijuana while on this medication.
  • Blood Sugar Levels: Acetazolamide, a medication used for various conditions, might affect your blood sugar levels. It can increase your blood sugar, which can be risky, especially if you have diabetes or are at risk of developing it. Watch out for signs of high sugar levels, such as feeling more thirsty than usual and urinating more often. If you notice these signs, get in touch with your healthcare provider right away. For those who already have diabetes, it’s crucial to check your blood sugar regularly, as your doctor has advised, and to keep them informed about the results. Remember that Acetazolamide can sometimes cause your blood sugar to drop too low. Symptoms of low blood sugar levels can involve sweating, shaking, a fast heartbeat, feeling hungry, having blurry vision, or feeling tingles in your hands and feet. To quickly deal with low blood sugar, having glucose tablets or gel handy is helpful. If those aren’t available, you can also raise your blood sugar quickly by eating something sweet like sugar, honey, candy, or by drinking orange juice or a regular soda (not diet).
  • Sun Sensitivity: Acetazolamide may increase your sensitivity to the sun. It’s advisable to limit your exposure to direct sunlight, avoid tanning booths and sunlamps, and use sunscreen and wear protective clothing when outdoors. If you experience sunburn, skin blisters, or redness, notify your doctor immediately.
  • Pre-Surgical Considerations: Before undergoing any surgery, make sure to inform your doctor about all the medications you use, including nonprescription drugs, prescription drugs, and herbal products.

Considering these warnings and maintaining open communication with your healthcare provider or doctor, you can help ensure that you use Acetazolamide safely and effectively, minimizing potential risks and side effects. Always follow your doctor’s advice and report any unusual symptoms or changes in your condition quickly.


  • Do not use Acetazolamide if you are allergic to it or any sulfa drugs.
  • Avoid this medication if you have severe issues with your liver (including cirrhosis) or kidneys.
  • It is not safe to use Acetazolamide if you have an imbalance of electrolytes in your body, such as acidosis or low levels of potassium or sodium.
  • Do not use this medicine if you have adrenal gland failure.
  • Mention any significant respiratory issues you might have.
  • Specifically, indicate if you suffer from this type of glaucoma.
  • Let your doctor know if you are taking high doses of aspirin.
  • Acetazolamide is not approved for use by anyone under the age of 18.

Other Important Precautions

  • Considerations for Older Adults: Older adults may be more sensitive to the several side effects of this drug, particularly dizziness and lightheadedness.
  • Use During Pregnancy and Breastfeeding: During pregnancy, this medication should be used only when clearly needed and after consideration of the risks & benefits with your healthcare provider. Although Acetazolamide can pass into breast milk, it is generally considered safe for the nursing infant. However, it is still crucial to consult your doctor before breastfeeding.
  • Allergic Reactions: Before you start taking Acetazolamide, it’s essential to tell your doctor or healthcare giver if you have ever had an allergic reaction to this medication or if you have other allergies. Additionally, this medication may contain inactive ingredients that may cause various allergic reactions or other issues, so it’s important to discuss this with your healthcare provider.


  • Acetazolamide is related to sulfa drugs, and people who are allergic to sulfa medications might also react to Acetazolamide.
  • This medication should not be used if you have low sodium (Na) or potassium (K) levels in your blood.
  • Avoid using Acetazolamide if you have severe kidney or liver problems, adrenal gland failure, or a condition called hyperchloremic acidosis.
  • It is not safe for people with liver cirrhosis because it can increase the risk of serious liver complications, including hepatic encephalopathy.
  • Long-term use of Acetazolamide is not advised for treating chronic forms of angle-closure glaucoma.

Missed Dose

  • If you forget to take your Acetazolamide 250mg dose, take it when you remember. But if it’s close to your next Acetazolamide dose, skip the missed one & resume your usual schedule. 
  • Avoid doubling up on doses. Keep track of your medication routine to ensure consistent treatment efficacy. 
  • Inform your healthcare provider if you frequently miss doses or need help adhering to the prescribed schedule. 

[Note: If you have missed an Acetazolamide dose & are still unsure when to take the next one, immediately consult your doctor or pharmacist.]


In the event of a suspected overdose where the individual exhibits critical symptoms such as unconsciousness or difficulty breathing, it is important to act immediately by calling 911 to ensure rapid medical intervention. For other serious symptoms that do not appear to be life-threatening, contacting a poison control center should be the next course of action. Residents within the United States should quickly reach out to their local poison control center for expert guidance and assistance. 

[Note: If you consumed more than the usual recommended dose of Acetazolamide, get medical help quickly or call the Poison Help line at 1-800-222-1222.]


  • Do not store this medication at a temperature of more than 25°C. 
  • Avoid storing it in places exposed to light and moisture.
  • Do not store the Acetazolamide medication in the bathroom, as it can be humid, which might affect the medication’s effectiveness.
  • Ensure that Acetazolamide is kept out of reach of children & pets to prevent accidental ingestion.
  • Do not dispose of Acetazolamide by flushing it down the toilet unless you are specifically instructed to do so by a healthcare professional.
  • When the medication is expired or no longer needed, it should be disposed of properly. 
  • Consult your doctor or contact a local waste disposal company for guidance on safe disposal methods.

[Note: Discuss with your healthcare expert about the proper disposal of any unused medicine & any questions you may have regarding its storage.]

Acetazolamide Interactions

Acetazolamide is a medication that can interact with several other drugs and supplements. It’s crucial to inform your healthcare providers about all medications, vitamins, and supplements you are taking, whether prescripted, over-the-counter, or herbal, as they could potentially interact with Acetazolamide. Below, you will find a structured overview of the interactions that may occur with Acetazolamide, highlighting some particularly important medications to consider if you are prescribed this drug.

Not Recommended Combinations: Some drugs should not be taken with Acetazolamide due to the high risk of significant interactions. In some cases, your doctor might choose a different treatment or adjust other medications you are taking. Examples include:

  • Aspirin: Often used for pain relief and inflammation, but may have serious interactions when combined with Acetazolamide.
  • Methenamine: Used to treat urinary tract infections but can have adverse reactions with Acetazolamide.

Combinations Requiring Caution

In other situations, combining Acetazolamide with certain medications isn’t typically recommended but might be necessary for some patients. In such cases, your doctor might alter the administration dosage or frequency to manage the interaction safely. These medications include:

  • Acyclovir and Valacyclovir: Antiviral drugs that may have interactions with Acetazolamide, potentially affecting their effectiveness or increasing side effects.
  • Adefovir: Used to treat hepatitis B but can interact adversely with Acetazolamide.
  • Amphetamines (e.g., Amphetamine, Dextroamphetamine, Lisdexamfetamine): Stimulants commonly used for ADHD and narcolepsy. They can interact with Acetazolamide, affecting blood levels and response to therapy.
  • Arsenic Trioxide: Used for particular types of leukemia, but risky to combine with Acetazolamide without careful monitoring.
  • Benzphetamine: A treatment for obesity that can interact with Acetazolamide.
  • Carbamazepine: An anti-seizure medication also used for bipolar disorder that has known interactions with Acetazolamide.
  • Ceritinib: An anti-cancer medication that can have its levels affected by Acetazolamide.
  • Digitalis: Heart medication that, when used with Acetazolamide, could affect heart function.
  • Droperidol: Used for nausea and agitation but can have enhanced side effects with Acetazolamide.
  • Furosemide: A diuretic that can have its effect altered when used with Acetazolamide.
  • Levomethadyl: An opioid treatment, generally not recommended with Acetazolamide due to the risk of significant interactions.
  • Memantine: Used for Alzheimer’s disease, with potential interaction risks when taken with Acetazolamide.
  • Methamphetamine: A powerful stimulant that could interact with Acetazolamide.
  • Methotrexate: Commonly used for cancer and certain autoimmune diseases, methotrexate’s toxicity can be increased when used with Acetazolamide.
  • Porfimer, Proscillaridin, Quinidine, Sotalol: Various medications that affect different systems and can have interactions with Acetazolamide.

[Note: This isn’t a complete list, and there could be other drugs that interact with Acetazolamide. Make sure to tell your doctor about any prescription, over-the-counter medicines, and herbal products you’re taking.]

Acetazolamide Alternatives

[Note: Your doctor will choose what’s best for you. Don’t use any of these alternative medications without consulting your healthcare provider. Taking them by yourself may cause serious side effects.]

Frequently Asked Questions

What does Acetazolamide do to the brain?

Diamox, also known by its generic name Acetazolamide, is an FDA-approved drug primarily utilized in the management of several medical conditions. Its main applications include the treatment of glaucoma, a condition characterized by enhanced pressure in the eye that can lead to vision loss. 

It is also used in the management of epilepsy, a neurological disorder marked by unprovoked seizures. Additionally, Diamox is effective in treating idiopathic intracranial hypertension, which is a condition where the pressure surrounding the brain is elevated without an identifiable cause. This particular use is crucial for alleviating symptoms such as headaches and vision problems associated with the increased pressure.

Is Acetazolamide a safe drug?

Yes! Acetazolamide is a safe drug to use. However, it may cause electrolyte imbalances. Therefore, individuals with hypokalemia or hyponatremia should avoid its use. Additionally, it can impair kidney function, making it unsuitable for use in patients with kidney disease or compromised kidney function.

What kind of diuretic is Acetazolamide?

Acetazolamide is classified as a carbonic anhydrase inhibitor and stands out as the only member of this category with substantial diuretic effects. This medication is efficiently absorbed into the bloodstream and is primarily eliminated through renal pathways, specifically via tubular secretion. When administered, Acetazolamide can induce an alkaline diuresis, characterized by the rapid excretion of bicarbonate, which increases urine pH and volume, contributing to its diuretic action.

What is the difference between Diamox and Acetazolamide?

Acetazolamide, sold under Diamox as a brand name among others, is an active agent prescribed for various conditions, including glaucoma, epilepsy, acute mountain sickness, periodic paralysis, and idiopathic intracranial hypertension (unexplained increased brain pressure). Additionally, it is used to treat heart failure and to alkalinize urine.

Is Diamox safe for kidney patients?

When considering the safety of Diamox (acetazolamide) for kidney patients, it is important to adjust dosages based on the patient’s renal function. For patients with a creatinine clearance (CrCl) above 50 mL/min, the full dosage of 250 mg four times daily or 500 mg extended-release capsule twice daily can be used. For those with a CrCl between 10 to 50 mL/min, a half dose of 250 mg twice daily is recommended. However, Acetazolamide should not be administered if the CrCl is less than 10 mL/min.

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