Generic Name: methazolamide (meth a ZOLE a mide)
Brand Name: Neptazane, Glauctabs, MZM
What is methazolamide?
Methazolamide reduces the activity of a protein in your body called carbonic anhydrase. Blocking this protein can help reduce the amount of fluid in the eye, which decreases pressure inside the eye.
Methazolamide is used to lower pressure inside the eye (intraocular pressure) in people with certain types of glaucoma.
Methazolamide is also used as a diuretic ("water pill") in people with congestive heart failure, to reduce the build-up of fluid in the body. This build-up is called edema.
Methazolamide is also used to treat certain types of seizures, and to treat or prevent altitude sickness.
Methazolamide may also be used for purposes not listed in this medication guide.
What is the most important information I should know about methazolamide?
You should not use this medicine if you have cirrhosis, severe liver or kidney disease, an electrolyte imbalance, adrenal gland failure, or an allergy to methazolamide or sulfa drugs.
What should I discuss with my healthcare provider before taking methazolamide?
You should not use methazolamide if you are allergic to it, or if you have:
severe liver disease, or cirrhosis;
severe kidney disease;
an electrolyte imbalance (such as acidosis or low levels of potassium or sodium in your blood);
adrenal gland failure; or
an allergy to sulfa drugs.
To make sure methazolamide is safe for you, tell your doctor if you have:
severe breathing problems;
angle closure glaucoma; or
if you also take aspirin in high doses.
It is not known whether this medicine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant.
It is not known whether methazolamide passes into breast milk or if it could harm a nursing baby. You should not breast-feed while using this medicine.
Methazolamide is not approved for use by anyone younger than 18 years old.
How should I take methazolamide?
Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not use this medicine in larger or smaller amounts or for longer than recommended.
While using methazolamide, you may need frequent blood tests.
Methazolamide may be only part of a complete treatment program that may also include other medications. Follow your doctor's instructions very closely.
Store at room temperature away from moisture and heat. Keep the bottle tightly closed when not in use.
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking methazolamide?
This medicine may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.
Avoid exposure to sunlight or tanning beds. Methazolamide can make you sunburn more easily. Wear protective clothing and use sunscreen (SPF 30 or higher) when you are outdoors.
Methazolamide side effects
Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
blood in urine or stools;
a seizure (convulsions);
loss of movement in any part of your body;
a blood cell disorder--sudden weakness or ill feeling, fever, chills, sore throat, mouth sores, pale skin, feeling tired or short of breath, rapid heart rate, nosebleeds, bleeding gums;
liver problems--nausea, upper stomach pain or swelling, tired feeling, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes);
signs of metabolic acidosis--confusion, vomiting, lack of energy, irregular heartbeats;
signs of a kidney stone--pain in your side or lower back, blood in your urine, painful or difficult urination; or
severe skin reaction--fever, sore throat, swelling in your face or tongue, burning in your eyes, skin pain followed by a red or purple skin rash that spreads (especially in the face or upper body) and causes blistering and peeling.
Common side effects may include:
nausea, vomiting, loss of appetite, diarrhea;
numbness or tingling, especially in your arms and legs;
hearing problems, ringing in your ears;
increased urination; or
altered sense of taste.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
Methazolamide dosing information
Usual Adult Dose for Glaucoma:
50 to 100 mg orally 2 or 3 times a day
Comments: May be used concomitantly with miotic and osmotic agents.
Use: Treatment of ocular conditions where lowering intraocular pressure is likely to be of therapeutic benefit, such as chronic open-angle glaucoma, secondary glaucoma, and preoperatively in acute angle-closure glaucoma.
What other drugs will affect methazolamide?
Tell your doctor about all your current medicines and any you start or stop using, especially:
steroid medicine (prednisone, dexamethasone, and others).
This list is not complete. Other drugs may interact with methazolamide, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide.
More about methazolamide
- Other brands: Neptazane
Related treatment guides
Where can I get more information?
- Your pharmacist can provide more information about methazolamide.
- Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.
- Disclaimer: Every effort has been made to ensure that the information provided by Cerner Multum, Inc. ('Multum') is accurate, up-to-date, and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. Multum information has been compiled for use by healthcare practitioners and consumers in the United States and therefore Multum does not warrant that uses outside of the United States are appropriate, unless specifically indicated otherwise. Multum's drug information does not endorse drugs, diagnose patients or recommend therapy. Multum's drug information is an informational resource designed to assist licensed healthcare practitioners in caring for their patients and/or to serve consumers viewing this service as a supplement to, and not a substitute for, the expertise, skill, knowledge and judgment of healthcare practitioners. The absence of a warning for a given drug or drug combination in no way should be construed to indicate that the drug or drug combination is safe, effective or appropriate for any given patient. Multum does not assume any responsibility for any aspect of healthcare administered with the aid of information Multum provides. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the drugs you are taking, check with your doctor, nurse or pharmacist.
Copyright 1996-2012 Cerner Multum, Inc. Version: 5.02.
Last reviewed: October 22, 2015
Date modified: November 30, 2016