This medication is used to treat high blood pressure. Lowering high blood pressure helps prevent strokes, heart attacks, and kidney problems. Methyclothiazide is a "water pill" (diuretic) that causes your body to get rid of extra salt and water. This increases the amount of urine you make.
This medication also reduces extra fluid in the body (edema) caused by conditions such as congestive heart failure, liver disease, and kidney disease. Getting rid of extra water helps to reduce fluid in the lungs so that you can breathe easier. It also helps to decrease swelling of the arms, legs, and stomach/abdomen.
This section contains uses of this drug that are not listed in the approved professional labeling for the drug but that may be prescribed by your health care professional. Use this drug for a condition that is listed in this section only if it has been so prescribed by your health care professional.
This drug may also be used for a condition known as "water diabetes" (diabetes insipidus). It may also be used to reduce the risk of calcium kidney stones.
How to Use This Medication
Take this medication by mouth with or without food, usually once daily or as directed by your doctor. It is best to avoid taking this medication within 4 hours of your bedtime to avoid having to get up to urinate. Consult your doctor or pharmacist if you have questions about your dosing schedule.
The dosage is based on your medical condition and response to therapy. The manufacturer recommends that you do not take more than 10 milligrams as a single daily dose to treat edema or more than 5 milligrams daily to treat high blood pressure.
Use this medication regularly in order to get the most benefit from it. To help you remember, take it at the same time each day or as prescribed. Do not increase your dose, skip doses, or stop taking this medication unless directed by your doctor. It is important to continue taking this medication even if you feel well. Most people with high blood pressure do not feel sick. For the treatment of high blood pressure, it may take up to several weeks before the full benefit of this drug takes effect.
Cholestyramine and colestipol can decrease the absorption of this medication by your body. If you are taking either of these drugs, separate them from methyclothiazide by at least 4 hours.
Inform your doctor if your condition does not improve or if it worsens (for example if swelling increases, your routine blood pressure readings increase).