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Medications and Drugs

Brand Names: Aquatensen

Generic Name: methyclothiazide (Pronunciation: METH i kloe THYE a zide)

What is methyclothiazide (Aquatensen)?

Methyclothiazide is a thiazide diuretic (water pill) that helps prevent your body from absorbing too much salt, which can cause fluid retention.

Methyclothiazide treats fluid retention (edema) in people with congestive heart failure, cirrhosis of the liver, or kidney disorders, or edema caused by taking steroids or estrogen. This medication is also used to treat high blood pressure (hypertension).

Methyclothiazide may also be used for other purposes not listed in this medication guide.

Methyclothiazide 5 mg-MYL

round, blue, imprinted with M 29

What are the possible side effects of methyclothiazide (Aquatensen)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using this medication and call your doctor at once if you have a serious side effect such as:

  • dry mouth, thirst, nausea, vomiting;
  • feeling weak, drowsy, restless, or light-headed;
  • fast or uneven heartbeat;
  • muscle pain or weakness;
  • urinating less than usual;
  • numbness or tingly feeling;
  • a red, blistering, peeling skin rash;
  • jaundice (yellowing of the skin or eyes); or
  • pancreatitis (severe pain in your upper stomach spreading to your back, nausea and vomiting, fast heart rate).

Less serious side effects may include:

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

What is the most important information I should know about methyclothiazide (Aquatensen)?

Do not use this medication if you are allergic to methyclothiazide or if you are unable to urinate.

Before using this medication, tell your doctor if you have liver disease, kidney disease, asthma or allergies, gout, diabetes, or if you are allergic to sulfa drugs.

Avoid drinking alcohol, which can increase some of the side effects of methyclothiazide.

Avoid becoming overheated or dehydrated during exercise and in hot weather. Follow your doctor's instructions about the type and amount of liquids you should drink. In some cases, drinking too much liquid can be as unsafe as not drinking enough.

There are many other medicines that can interact with methyclothiazide. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor. Keep a list with you of all the medicines you use and show this list to any doctor or other healthcare provider who treats you.

If you are being treated for high blood pressure, keep using this medication even if you feel fine. High blood pressure often has no symptoms.



Report Problems to the Food and Drug Administration

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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