carbidopa/levodopa vs methyldopa
Side-by-side comparison of carbidopa/levodopa and methyldopa. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
moderate Known Drug Interaction
7.2 Drugs Metabolized by Catechol-O-Methyltransferase (COMT) Drugs known to be metabolized by COMT, such as isoproterenol, epinephrine, norepinephrine, dopamine, dobutamine, alpha-methyldopa, apomorphine, isoetherine, and bitolterol should be administered with caution in patients receiving entacapone regardless of the route of administration (including inhalation), as their interaction may result in increased heart rates, possibly arrhythmias, and excessive changes in blood pressure [ see Warnings and Precautions (5.10) ].
Recommendation: Use these medicines together with caution. Your doctor should monitor your heart rate and blood pressure closely during treatment.
Sinemet
Aldomet
This medicine contains carbidopa, levodopa, and entacapone. It is used to treat Parkinson's disease.
Methyldopa is a medicine used to treat high blood pressure. It helps to lower your blood pressure.
This medicine treats Parkinson's disease. It can help when other medicines stop working as well near the end of a dose. It can also replace other medicines containing similar ingredients.
Methyldopa is used to treat hypertension, which is also known as high blood pressure. High blood pressure can strain the heart and blood vessels. Lowering blood pressure can reduce the risk of strokes, heart attacks, and kidney problems.
Levodopa turns into dopamine in your brain, helping to control movement. Carbidopa helps levodopa get to your brain. Entacapone helps levodopa work longer.
Methyldopa lowers blood pressure by affecting certain chemicals in your brain. These chemicals help to relax blood vessels, which allows blood to flow more easily. This results in lower blood pressure.
- • Uncontrolled movements
- • Diarrhea
- • Nausea
- • Belly pain
- • Vomiting
- • Sedation
- • Headache
- • Weakness
- Fall 4,293
- Seeing or hearing things that are not there 3,733
- Shaking 3,257
- Uncontrolled movements 2,903
- Death 2,727
- Baby exposed to drug during pregnancy 1,261
- Baby born too early 888
- Mother exposed to drug during pregnancy 794
- Exposure to drug during pregnancy 654
- Delivery before term 561
This medicine can make you fall asleep suddenly, even when you feel awake. Be careful when driving or doing other activities where you need to be alert. Stopping this medicine suddenly can cause serious problems like fever and confusion.
You should not take methyldopa if you have active liver disease like hepatitis or cirrhosis. Also, do not take it if you have had liver problems caused by methyldopa in the past. Do not take it if you are allergic to any of the ingredients in methyldopa. You should not take this medicine if you are taking a monoamine oxidase (MAO) inhibitor.
This medicine may harm your unborn baby. Talk to your doctor if you are pregnant or plan to become pregnant. It is not known if this medicine passes into breast milk.
Tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. Methyldopa can pass into breast milk. Talk to your doctor about the risks and benefits.
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How to Read This carbidopa/levodopa vs methyldopa Comparison
carbidopa/levodopa is classified in the Dopamine Precursor Combination drug class, while methyldopa sits within the Central Alpha-2 Agonist class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, carbidopa/levodopa has 16,913 submissions while methyldopa has 4,158. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known moderate interaction flagged in FDA labeling, attributed to both of these drugs are processed by the same enzyme in the body. taking them together can cause the drugs to build up, which may lead to a fast heart rate or changes in blood pressure.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between carbidopa/levodopa and methyldopa - always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.