Examples
| Brand Name | Chemical Name |
| Aldomet | methyldopa |
Methyldopa reduces high blood pressure (hypertension). It is given as tablets or liquid (orally) or through a vein (intravenously, or IV).
How It Works
Methyldopa affects the nerves that relax the walls of blood vessels, causing the blood vessels to widen (dilate) and thus reducing blood pressure.
Why It Is Used
Methyldopa is used to help control blood pressure in chronic hypertension during pregnancy. Other medicines may be added for blood pressure control, if needed.
Methyldopa is not used in women who have liver or kidney disease.
How Well It Works
Methyldopa is usually effective for the control of chronic hypertension during pregnancy.1
Side Effects
The side effects of methyldopa are usually mild and may include:
- Sleepiness.
- Dry mouth.
- Weakness when treatment first begins.
- Low blood pressure.
- Swelling of the feet and legs and weight gain caused by fluid retention (edema).
- Slow heart rate (bradycardia).
- Nausea and vomiting.
- Constipation.
- Diarrhea.
- Headache, dizziness, or lightheadedness.
- Blood abnormalities (rare).
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
What To Think About
Methyldopa is generally considered safe for use during pregnancy. It is often the first medicine chosen to lower high blood pressure during pregnancy.
Methyldopa is most often used in its oral form for the treatment of high blood pressure during pregnancy.
Methyldopa does not begin lowering blood pressure until 4 to 6 hours after it is taken. Therefore, it is not a good choice when blood pressure needs to be lowered quickly.
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Credits
| Author | Shannon Erstad, MBA/MPH |
| Editor | Kathleen M. Ariss, MS |
| Associate Editor | Pat Truman |
| Primary Medical Reviewer | Joy Melnikow, MD, MPH - Family Medicine |
| Specialist Medical Reviewer | William Gilbert, MD - Perinatology |
| Last Updated | November 22, 2006 |
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